HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept
{
"count": 5436,
"next": "https://hermes.lco.global/api/v0/nonlocalizedevents/?format=api&limit=100&offset=4100",
"previous": "https://hermes.lco.global/api/v0/nonlocalizedevents/?format=api&limit=100&offset=3900",
"results": [
{
"event_id": "S250302v",
"sequences": [
{
"id": 8197,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184771,
"topic": "igwn.gwalert",
"uuid": "bc26f2fc-ff62-436a-9418-681e7b05c469",
"title": "S250302v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250302v/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250302v/view/"
},
"event": {
"far": 1.14490944467904e-05,
"time": "2025-03-02T10:50:13.291Z",
"group": "CBC",
"search": "AllSky",
"area_50": 374.42987746983187,
"area_90": 1432.464428964159,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "bb4a37553eb61ce68efd60f315b2b4ce",
"classification": {
"BBH": 0.0,
"BNS": 0.004946179343749748,
"NSBH": 2.75724247817392e-08,
"Terrestrial": 0.9950537930838255
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-02T10:50:42Z",
"superevent_id": "S250302v",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T10:50:43.055671Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T10:50:43.055703Z",
"modified": "2025-03-02T10:50:43.067293Z"
}
},
{
"id": 8198,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184772,
"topic": "igwn.gwalert",
"uuid": "1d17440b-86b9-4852-a7cc-ba8789fcf9ea",
"title": "S250302v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250302v/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250302v/view/"
},
"event": {
"far": 1.14490944467904e-05,
"time": "2025-03-02T10:50:13.291Z",
"group": "CBC",
"search": "AllSky",
"area_50": 349.40843567197396,
"area_90": 1354.2002965482177,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "7a42075f5bd56e9da3809e4906bac802",
"classification": {
"BBH": 0.0,
"BNS": 0.004946206916174534,
"NSBH": 0.0,
"Terrestrial": 0.9950537930838255
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-02T10:55:17Z",
"superevent_id": "S250302v",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T10:55:18.252905Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T10:55:18.252936Z",
"modified": "2025-03-02T10:55:18.261724Z"
}
}
],
"references": []
},
{
"event_id": "140601_60511904",
"sequences": [
{
"id": 8196,
"sequence_number": 0,
"sequence_type": "INITIAL",
"message": {
"id": 184692,
"topic": "gcn.classic.text.ICECUBE_ASTROTRACK_GOLD",
"uuid": "dce52a04-fdcd-4e73-830c-aa2c20cf970f",
"title": "GCN/AMON NOTICE",
"submitter": "",
"authors": "",
"data": {
"far": "0.1579 [yr^-1]",
"urls": {
"gcn": "https://gcn.gsfc.nasa.gov/notices_amon_g_b/140601_60511904.amon"
},
"title": "GCN/AMON NOTICE",
"energy": "1.4538e+03 [TeV]",
"src_ra": "348.3255d {+23h 13m 18s} (J2000),\n348.6461d {+23h 14m 35s} (current),\n347.6886d {+23h 10m 45s} (1950)",
"stream": "24",
"run_num": "140601",
"src_dec": "+3.6783d {+03d 40' 42\"} (J2000),\n+3.8156d {+03d 48' 56\"} (current),\n+3.4060d {+03d 24' 21\"} (1950)",
"comments": "IceCube Gold event.\nThe position error is statistical only, there is no systematic added.",
"revision": "0",
"sun_dist": "12.22 [deg] Sun_angle= -0.4 [hr] (East of Sun)",
"event_num": "60511904",
"moon_dist": "20.78 [deg]",
"src_error": "30.80 [arcmin radius, stat-only, 90% containment]",
"sun_postn": "343.21d {+22h 52m 50s} -7.14d {-07d 08' 11\"}",
"ecl_coords": "350.72, 8.00 [deg] ecliptic lon,lat of the event",
"gal_coords": "81.59,-51.14 [deg] galactic lon,lat of the event",
"moon_postn": "9.44d {+00h 37m 46s} +5.27d {+05d 16' 09\"}",
"signalness": "9.7230e-01 [dn]",
"notice_date": "Sun 02 Mar 25 03:21:47 UT",
"notice_type": "ICECUBE Astrotrack Gold",
"src_error50": "12.00 [arcmin radius, stat-only, 50% containment]",
"discovery_date": "20736 TJD; 61 DOY; 25/03/02 (yy/mm/dd)",
"discovery_time": "12052 SOD {03:20:52.90} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sun 02 Mar 25 03:21:47 UT\nNOTICE_TYPE: ICECUBE Astrotrack Gold \nSTREAM: 24\nRUN_NUM: 140601\nEVENT_NUM: 60511904\nSRC_RA: 348.3255d {+23h 13m 18s} (J2000),\n 348.6461d {+23h 14m 35s} (current),\n 347.6886d {+23h 10m 45s} (1950)\nSRC_DEC: +3.6783d {+03d 40' 42\"} (J2000),\n +3.8156d {+03d 48' 56\"} (current),\n +3.4060d {+03d 24' 21\"} (1950)\nSRC_ERROR: 30.80 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 12.00 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20736 TJD; 61 DOY; 25/03/02 (yy/mm/dd)\nDISCOVERY_TIME: 12052 SOD {03:20:52.90} UT\nREVISION: 0\nENERGY: 1.4538e+03 [TeV]\nSIGNALNESS: 9.7230e-01 [dn]\nFAR: 0.1579 [yr^-1]\nSUN_POSTN: 343.21d {+22h 52m 50s} -7.14d {-07d 08' 11\"}\nSUN_DIST: 12.22 [deg] Sun_angle= -0.4 [hr] (East of Sun)\nMOON_POSTN: 9.44d {+00h 37m 46s} +5.27d {+05d 16' 09\"}\nMOON_DIST: 20.78 [deg]\nGAL_COORDS: 81.59,-51.14 [deg] galactic lon,lat of the event\nECL_COORDS: 350.72, 8.00 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Gold event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-03-02T03:21:47Z",
"message_parser": "Icecube Notice Plaintext Parser v1",
"retracted": false,
"created": "2025-03-02T04:05:48.381789Z",
"modified": "2025-03-02T04:05:48.387426Z"
}
},
{
"id": 8201,
"sequence_number": 1,
"sequence_type": "UPDATE",
"message": {
"id": 184841,
"topic": "gcn.classic.text.ICECUBE_ASTROTRACK_GOLD",
"uuid": "1519f555-a82c-411f-a749-adc6f5c7f750",
"title": "GCN/AMON NOTICE",
"submitter": "",
"authors": "",
"data": {
"far": "0.1579 [yr^-1]",
"urls": {
"gcn": "https://gcn.gsfc.nasa.gov/notices_amon_g_b/140601_60511904.amon"
},
"title": "GCN/AMON NOTICE",
"energy": "1.4538e+03 [TeV]",
"src_ra": "348.2200d {+23h 12m 53s} (J2000),\n348.5407d {+23h 14m 10s} (current),\n347.5830d {+23h 10m 20s} (1950)",
"stream": "24",
"run_num": "140601",
"src_dec": "+3.5499d {+03d 32' 60\"} (J2000),\n+3.6871d {+03d 41' 14\"} (current),\n+3.2777d {+03d 16' 40\"} (1950)",
"comments": "IceCube Gold event.\nThe position error is statistical only, there is no systematic added.",
"revision": "1",
"sun_dist": "11.67 [deg] Sun_angle= -0.3 [hr] (East of Sun)",
"event_num": "60511904",
"moon_dist": "28.14 [deg]",
"src_error": "27.00 [arcmin radius, stat-only, 90% containment]",
"sun_postn": "343.70d {+22h 54m 48s} -6.94d {-06d 56' 08\"}",
"ecl_coords": "350.57, 7.92 [deg] ecliptic lon,lat of the event",
"gal_coords": "81.34,-51.18 [deg] galactic lon,lat of the event",
"moon_postn": "16.38d {+01h 05m 31s} +8.90d {+08d 53' 45\"}",
"signalness": "9.7230e-01 [dn]",
"notice_date": "Sun 02 Mar 25 15:58:17 UT",
"notice_type": "ICECUBE Astrotrack Gold",
"src_error50": "15.00 [arcmin radius, stat-only, 50% containment]",
"discovery_date": "20736 TJD; 61 DOY; 25/03/02 (yy/mm/dd)",
"discovery_time": "12052 SOD {03:20:52.90} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sun 02 Mar 25 15:58:17 UT\nNOTICE_TYPE: ICECUBE Astrotrack Gold \nSTREAM: 24\nRUN_NUM: 140601\nEVENT_NUM: 60511904\nSRC_RA: 348.2200d {+23h 12m 53s} (J2000),\n 348.5407d {+23h 14m 10s} (current),\n 347.5830d {+23h 10m 20s} (1950)\nSRC_DEC: +3.5499d {+03d 32' 60\"} (J2000),\n +3.6871d {+03d 41' 14\"} (current),\n +3.2777d {+03d 16' 40\"} (1950)\nSRC_ERROR: 27.00 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 15.00 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20736 TJD; 61 DOY; 25/03/02 (yy/mm/dd)\nDISCOVERY_TIME: 12052 SOD {03:20:52.90} UT\nREVISION: 1\nENERGY: 1.4538e+03 [TeV]\nSIGNALNESS: 9.7230e-01 [dn]\nFAR: 0.1579 [yr^-1]\nSUN_POSTN: 343.70d {+22h 54m 48s} -6.94d {-06d 56' 08\"}\nSUN_DIST: 11.67 [deg] Sun_angle= -0.3 [hr] (East of Sun)\nMOON_POSTN: 16.38d {+01h 05m 31s} +8.90d {+08d 53' 45\"}\nMOON_DIST: 28.14 [deg]\nGAL_COORDS: 81.34,-51.18 [deg] galactic lon,lat of the event\nECL_COORDS: 350.57, 7.92 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Gold event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-03-02T15:58:17Z",
"message_parser": "Icecube Notice Plaintext Parser v1",
"retracted": false,
"created": "2025-03-02T16:04:25.146143Z",
"modified": "2025-03-02T16:04:25.151387Z"
}
}
],
"references": [
{
"id": 184841,
"topic": "gcn.classic.text.ICECUBE_ASTROTRACK_GOLD",
"uuid": "1519f555-a82c-411f-a749-adc6f5c7f750",
"title": "GCN/AMON NOTICE",
"submitter": "",
"authors": "",
"data": {
"far": "0.1579 [yr^-1]",
"urls": {
"gcn": "https://gcn.gsfc.nasa.gov/notices_amon_g_b/140601_60511904.amon"
},
"title": "GCN/AMON NOTICE",
"energy": "1.4538e+03 [TeV]",
"src_ra": "348.2200d {+23h 12m 53s} (J2000),\n348.5407d {+23h 14m 10s} (current),\n347.5830d {+23h 10m 20s} (1950)",
"stream": "24",
"run_num": "140601",
"src_dec": "+3.5499d {+03d 32' 60\"} (J2000),\n+3.6871d {+03d 41' 14\"} (current),\n+3.2777d {+03d 16' 40\"} (1950)",
"comments": "IceCube Gold event.\nThe position error is statistical only, there is no systematic added.",
"revision": "1",
"sun_dist": "11.67 [deg] Sun_angle= -0.3 [hr] (East of Sun)",
"event_num": "60511904",
"moon_dist": "28.14 [deg]",
"src_error": "27.00 [arcmin radius, stat-only, 90% containment]",
"sun_postn": "343.70d {+22h 54m 48s} -6.94d {-06d 56' 08\"}",
"ecl_coords": "350.57, 7.92 [deg] ecliptic lon,lat of the event",
"gal_coords": "81.34,-51.18 [deg] galactic lon,lat of the event",
"moon_postn": "16.38d {+01h 05m 31s} +8.90d {+08d 53' 45\"}",
"signalness": "9.7230e-01 [dn]",
"notice_date": "Sun 02 Mar 25 15:58:17 UT",
"notice_type": "ICECUBE Astrotrack Gold",
"src_error50": "15.00 [arcmin radius, stat-only, 50% containment]",
"discovery_date": "20736 TJD; 61 DOY; 25/03/02 (yy/mm/dd)",
"discovery_time": "12052 SOD {03:20:52.90} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sun 02 Mar 25 15:58:17 UT\nNOTICE_TYPE: ICECUBE Astrotrack Gold \nSTREAM: 24\nRUN_NUM: 140601\nEVENT_NUM: 60511904\nSRC_RA: 348.2200d {+23h 12m 53s} (J2000),\n 348.5407d {+23h 14m 10s} (current),\n 347.5830d {+23h 10m 20s} (1950)\nSRC_DEC: +3.5499d {+03d 32' 60\"} (J2000),\n +3.6871d {+03d 41' 14\"} (current),\n +3.2777d {+03d 16' 40\"} (1950)\nSRC_ERROR: 27.00 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 15.00 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20736 TJD; 61 DOY; 25/03/02 (yy/mm/dd)\nDISCOVERY_TIME: 12052 SOD {03:20:52.90} UT\nREVISION: 1\nENERGY: 1.4538e+03 [TeV]\nSIGNALNESS: 9.7230e-01 [dn]\nFAR: 0.1579 [yr^-1]\nSUN_POSTN: 343.70d {+22h 54m 48s} -6.94d {-06d 56' 08\"}\nSUN_DIST: 11.67 [deg] Sun_angle= -0.3 [hr] (East of Sun)\nMOON_POSTN: 16.38d {+01h 05m 31s} +8.90d {+08d 53' 45\"}\nMOON_DIST: 28.14 [deg]\nGAL_COORDS: 81.34,-51.18 [deg] galactic lon,lat of the event\nECL_COORDS: 350.57, 7.92 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Gold event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-03-02T15:58:17Z",
"message_parser": "Icecube Notice Plaintext Parser v1",
"retracted": false,
"created": "2025-03-02T16:04:25.146143Z",
"modified": "2025-03-02T16:04:25.151387Z",
"targets": [
{
"id": 228,
"name": "icecube_140601_60511904_src",
"right_ascension": 348.22,
"right_ascension_sexagesimal": "23:12:52.8",
"declination": 3.5499,
"declination_sexagesimal": "3:32:59.64"
}
]
},
{
"id": 184692,
"topic": "gcn.classic.text.ICECUBE_ASTROTRACK_GOLD",
"uuid": "dce52a04-fdcd-4e73-830c-aa2c20cf970f",
"title": "GCN/AMON NOTICE",
"submitter": "",
"authors": "",
"data": {
"far": "0.1579 [yr^-1]",
"urls": {
"gcn": "https://gcn.gsfc.nasa.gov/notices_amon_g_b/140601_60511904.amon"
},
"title": "GCN/AMON NOTICE",
"energy": "1.4538e+03 [TeV]",
"src_ra": "348.3255d {+23h 13m 18s} (J2000),\n348.6461d {+23h 14m 35s} (current),\n347.6886d {+23h 10m 45s} (1950)",
"stream": "24",
"run_num": "140601",
"src_dec": "+3.6783d {+03d 40' 42\"} (J2000),\n+3.8156d {+03d 48' 56\"} (current),\n+3.4060d {+03d 24' 21\"} (1950)",
"comments": "IceCube Gold event.\nThe position error is statistical only, there is no systematic added.",
"revision": "0",
"sun_dist": "12.22 [deg] Sun_angle= -0.4 [hr] (East of Sun)",
"event_num": "60511904",
"moon_dist": "20.78 [deg]",
"src_error": "30.80 [arcmin radius, stat-only, 90% containment]",
"sun_postn": "343.21d {+22h 52m 50s} -7.14d {-07d 08' 11\"}",
"ecl_coords": "350.72, 8.00 [deg] ecliptic lon,lat of the event",
"gal_coords": "81.59,-51.14 [deg] galactic lon,lat of the event",
"moon_postn": "9.44d {+00h 37m 46s} +5.27d {+05d 16' 09\"}",
"signalness": "9.7230e-01 [dn]",
"notice_date": "Sun 02 Mar 25 03:21:47 UT",
"notice_type": "ICECUBE Astrotrack Gold",
"src_error50": "12.00 [arcmin radius, stat-only, 50% containment]",
"discovery_date": "20736 TJD; 61 DOY; 25/03/02 (yy/mm/dd)",
"discovery_time": "12052 SOD {03:20:52.90} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sun 02 Mar 25 03:21:47 UT\nNOTICE_TYPE: ICECUBE Astrotrack Gold \nSTREAM: 24\nRUN_NUM: 140601\nEVENT_NUM: 60511904\nSRC_RA: 348.3255d {+23h 13m 18s} (J2000),\n 348.6461d {+23h 14m 35s} (current),\n 347.6886d {+23h 10m 45s} (1950)\nSRC_DEC: +3.6783d {+03d 40' 42\"} (J2000),\n +3.8156d {+03d 48' 56\"} (current),\n +3.4060d {+03d 24' 21\"} (1950)\nSRC_ERROR: 30.80 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 12.00 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20736 TJD; 61 DOY; 25/03/02 (yy/mm/dd)\nDISCOVERY_TIME: 12052 SOD {03:20:52.90} UT\nREVISION: 0\nENERGY: 1.4538e+03 [TeV]\nSIGNALNESS: 9.7230e-01 [dn]\nFAR: 0.1579 [yr^-1]\nSUN_POSTN: 343.21d {+22h 52m 50s} -7.14d {-07d 08' 11\"}\nSUN_DIST: 12.22 [deg] Sun_angle= -0.4 [hr] (East of Sun)\nMOON_POSTN: 9.44d {+00h 37m 46s} +5.27d {+05d 16' 09\"}\nMOON_DIST: 20.78 [deg]\nGAL_COORDS: 81.59,-51.14 [deg] galactic lon,lat of the event\nECL_COORDS: 350.72, 8.00 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Gold event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-03-02T03:21:47Z",
"message_parser": "Icecube Notice Plaintext Parser v1",
"retracted": false,
"created": "2025-03-02T04:05:48.381789Z",
"modified": "2025-03-02T04:05:48.387426Z",
"targets": [
{
"id": 227,
"name": "icecube_140601_60511904_src",
"right_ascension": 348.3255,
"right_ascension_sexagesimal": "23:13:18.12",
"declination": 3.6783,
"declination_sexagesimal": "3:40:41.88"
}
]
}
]
},
{
"event_id": "S250302bw",
"sequences": [
{
"id": 8202,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184845,
"topic": "igwn.gwalert",
"uuid": "8dc4a469-115d-4f3f-8beb-5fa6704b4c5d",
"title": "S250302bw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250302bw/view/"
},
"event": {
"far": 7.025575464158056e-07,
"time": "2025-03-02T16:25:14.639Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7157.496206360833,
"area_90": 22414.176089009427,
"duration": 0.09375,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "e24c1e6089a2f87dd92770dc4c258253",
"classification": {},
"skymap_version": 0,
"central_frequency": 96.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-02T16:25:59Z",
"superevent_id": "S250302bw",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T16:26:01.184125Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T16:26:01.184208Z",
"modified": "2025-03-02T16:26:01.196214Z"
}
},
{
"id": 8203,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184846,
"topic": "igwn.gwalert",
"uuid": "989fdf7a-846a-44e0-99c1-ac6246895ace",
"title": "S250302bw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250302bw/view/"
},
"event": {
"far": 7.025575464158056e-07,
"time": "2025-03-02T16:25:14.639Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7157.496206360833,
"area_90": 22414.176089009427,
"duration": 0.09375,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "e24c1e6089a2f87dd92770dc4c258253",
"classification": {},
"skymap_version": 0,
"central_frequency": 96.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-02T16:30:34Z",
"superevent_id": "S250302bw",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T16:30:35.542692Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T16:30:35.542723Z",
"modified": "2025-03-02T16:30:35.551628Z"
}
}
],
"references": []
},
{
"event_id": "S250302ch",
"sequences": [
{
"id": 8204,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184860,
"topic": "igwn.gwalert",
"uuid": "6e160190-6a16-41b0-a766-6f5ace6e41c7",
"title": "S250302ch - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250302ch/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250302ch/view/"
},
"event": {
"far": 2.004553e-05,
"time": "2025-03-02T17:40:49.335Z",
"group": "CBC",
"search": "AllSky",
"area_50": 563.7955061706015,
"area_90": 2438.14803933844,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 7.033862312320587e-05,
"HasMassGap": 0.5492648691794394,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "fb060026eb90bc4bbda0ffa1d6ad23cc",
"classification": {
"BBH": 0.033117549,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.966882451
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-02T17:41:20Z",
"superevent_id": "S250302ch",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T17:41:21.631201Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T17:41:21.631234Z",
"modified": "2025-03-02T17:41:21.646964Z"
}
},
{
"id": 8205,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184861,
"topic": "igwn.gwalert",
"uuid": "a77e9b2b-5527-4d3c-bd9e-4274eb304d26",
"title": "S250302ch - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250302ch/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250302ch/view/"
},
"event": {
"far": 2.004553e-05,
"time": "2025-03-02T17:40:49.335Z",
"group": "CBC",
"search": "AllSky",
"area_50": 563.7955061706015,
"area_90": 2438.14803933844,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 7.033862312320587e-05,
"HasMassGap": 0.5492648691794394,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "fb060026eb90bc4bbda0ffa1d6ad23cc",
"classification": {
"BBH": 0.033117549,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.966882451
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-02T17:45:56Z",
"superevent_id": "S250302ch",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T17:45:58.035256Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T17:45:58.035312Z",
"modified": "2025-03-02T17:45:58.044743Z"
}
}
],
"references": []
},
{
"event_id": "S250302db",
"sequences": [
{
"id": 8206,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184889,
"topic": "igwn.gwalert",
"uuid": "5b686581-614a-4a75-9e97-b4820ecf290e",
"title": "S250302db - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250302db/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250302db/view/"
},
"event": {
"far": 2.21711e-05,
"time": "2025-03-02T20:23:41.770Z",
"group": "CBC",
"search": "BBH",
"area_50": 710.0424238486473,
"area_90": 2463.326848694775,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "2ebf1a79c23cde2f59ae65177d348f89",
"classification": {
"BBH": 0.0008771417181436814,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9991228582818563
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-02T20:25:00Z",
"superevent_id": "S250302db",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T20:25:01.597991Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T20:25:01.598020Z",
"modified": "2025-03-02T20:25:01.610326Z"
}
},
{
"id": 8207,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184890,
"topic": "igwn.gwalert",
"uuid": "7526af30-fcd1-48d1-a019-6e37a3af1c9a",
"title": "S250302db - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250302db/files/cwb.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250302db/view/"
},
"event": {
"far": 5.96104e-06,
"time": "2025-03-02T20:23:41.689Z",
"group": "Burst",
"search": "AllSky",
"area_50": 929.9373588939729,
"area_90": 4237.593614671182,
"duration": 0.023531,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "91417e768a4e00d4f06b59ea21b024bd",
"classification": {},
"skymap_version": 1,
"central_frequency": 59.571335
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-02T20:29:36Z",
"superevent_id": "S250302db",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T20:29:37.375245Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T20:29:37.375275Z",
"modified": "2025-03-02T20:29:37.384407Z"
}
}
],
"references": []
},
{
"event_id": "S250302eh",
"sequences": [
{
"id": 8208,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184925,
"topic": "igwn.gwalert",
"uuid": "9278f8f2-acfb-41a9-a862-283a9ec68cb3",
"title": "S250302eh - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250302eh/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250302eh/view/"
},
"event": {
"far": 1.854682762774348e-05,
"time": "2025-03-02T23:15:25.900Z",
"group": "CBC",
"search": "AllSky",
"area_50": 691.7877870653044,
"area_90": 2720.989997774603,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "21596b095f0cfc4d8590007f0b813b4f",
"classification": {
"BBH": 0.057586716238708285,
"BNS": 1.1428035301654272e-15,
"NSBH": 8.197071308250001e-14,
"Terrestrial": 0.9424132837612086
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-02T23:15:49Z",
"superevent_id": "S250302eh",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T23:15:51.035753Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T23:15:51.035808Z",
"modified": "2025-03-02T23:15:51.047140Z"
}
},
{
"id": 8210,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184927,
"topic": "igwn.gwalert",
"uuid": "8204ff54-ad73-4910-8b73-3d8d45274185",
"title": "S250302eh - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250302eh/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250302eh/view/"
},
"event": {
"far": 1.854682762774348e-05,
"time": "2025-03-02T23:15:25.900Z",
"group": "CBC",
"search": "AllSky",
"area_50": 691.7877870653044,
"area_90": 2720.989997774603,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "21596b095f0cfc4d8590007f0b813b4f",
"classification": {
"BBH": 0.057586716238708285,
"BNS": 1.1428035301654272e-15,
"NSBH": 8.197071308250001e-14,
"Terrestrial": 0.9424132837612086
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-02T23:20:25Z",
"superevent_id": "S250302eh",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T23:20:26.430704Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T23:20:26.430750Z",
"modified": "2025-03-02T23:20:26.451761Z"
}
}
],
"references": []
},
{
"event_id": "S250302ei",
"sequences": [
{
"id": 8209,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184926,
"topic": "igwn.gwalert",
"uuid": "ed479705-8fc8-49b7-a19e-ebae72fc0fe0",
"title": "S250302ei - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250302ei/view/"
},
"event": {
"far": 2.267569673763616e-05,
"time": "2025-03-02T23:16:15.546Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7437.8202838613615,
"area_90": 22707.089571188124,
"duration": 0.34375,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "052ba24a30bbcada2e0b07ae3af818f4",
"classification": {},
"skymap_version": 0,
"central_frequency": 56.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-02T23:17:03Z",
"superevent_id": "S250302ei",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T23:17:04.374665Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T23:17:04.374720Z",
"modified": "2025-03-02T23:17:04.385780Z"
}
},
{
"id": 8211,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184928,
"topic": "igwn.gwalert",
"uuid": "5aab6d86-63e8-42b2-9562-81037d940768",
"title": "S250302ei - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250302ei/view/"
},
"event": {
"far": 2.267569673763616e-05,
"time": "2025-03-02T23:16:15.546Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7437.8202838613615,
"area_90": 22707.089571188124,
"duration": 0.34375,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "052ba24a30bbcada2e0b07ae3af818f4",
"classification": {},
"skymap_version": 0,
"central_frequency": 56.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-02T23:21:38Z",
"superevent_id": "S250302ei",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T23:21:38.793821Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T23:21:38.793851Z",
"modified": "2025-03-02T23:21:38.800528Z"
}
}
],
"references": []
},
{
"event_id": "S250303j",
"sequences": [
{
"id": 8212,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184959,
"topic": "igwn.gwalert",
"uuid": "cbeb2ee9-93fe-4e2b-b747-0e28a6b29919",
"title": "S250303j - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303j/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303j/view/"
},
"event": {
"far": 2.657272e-06,
"time": "2025-03-03T02:09:41.225Z",
"group": "CBC",
"search": "AllSky",
"area_50": 736.0605268501935,
"area_90": 2518.720229278712,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.13418224009481616,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "9a3d27637ac3cea8085c9cdb2dc9abe1",
"classification": {
"BBH": 0.30921648,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.69078352
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-03T02:10:15Z",
"superevent_id": "S250303j",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T02:10:16.259062Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T02:10:16.259107Z",
"modified": "2025-03-03T02:10:16.271352Z"
}
},
{
"id": 8213,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184960,
"topic": "igwn.gwalert",
"uuid": "c2070009-619a-4c9d-8548-575ab6c0037a",
"title": "S250303j - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303j/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303j/view/"
},
"event": {
"far": 2.657272e-06,
"time": "2025-03-03T02:09:41.225Z",
"group": "CBC",
"search": "AllSky",
"area_50": 736.0605268501935,
"area_90": 2518.720229278712,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.13418224009481616,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "9a3d27637ac3cea8085c9cdb2dc9abe1",
"classification": {
"BBH": 0.30921648,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.69078352
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-03T02:14:50Z",
"superevent_id": "S250303j",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T02:14:51.551578Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T02:14:51.551610Z",
"modified": "2025-03-03T02:14:51.558153Z"
}
}
],
"references": []
},
{
"event_id": "S250303bf",
"sequences": [
{
"id": 8226,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185016,
"topic": "igwn.gwalert",
"uuid": "dea5d7f7-3857-4af5-86c4-9b52f82c6430",
"title": "S250303bf - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303bf/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303bf/view/"
},
"event": {
"far": 7.114158e-07,
"time": "2025-03-03T06:49:16.317Z",
"group": "CBC",
"search": "AllSky",
"area_50": 475.98440854038313,
"area_90": 1611.863445628046,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.41385580547777095,
"HasRemnant": 0.8424627881122344
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "d1de5c53af179d59d7003db40cdf920c",
"classification": {
"BBH": 0.0,
"BNS": 0.007315541,
"NSBH": 0.0063716,
"Terrestrial": 0.986312859
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-03T06:49:45Z",
"superevent_id": "S250303bf",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T06:49:46.876328Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T06:49:46.876375Z",
"modified": "2025-03-03T06:49:46.888293Z"
}
},
{
"id": 8227,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185017,
"topic": "igwn.gwalert",
"uuid": "edd5db27-c557-4235-9281-30888b2e6516",
"title": "S250303bf - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303bf/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303bf/view/"
},
"event": {
"far": 7.114158e-07,
"time": "2025-03-03T06:49:16.317Z",
"group": "CBC",
"search": "AllSky",
"area_50": 475.98440854038313,
"area_90": 1611.863445628046,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.41385580547777095,
"HasRemnant": 0.8424627881122344
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "d1de5c53af179d59d7003db40cdf920c",
"classification": {
"BBH": 0.0,
"BNS": 0.007315541,
"NSBH": 0.0063716,
"Terrestrial": 0.986312859
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-03T06:54:20Z",
"superevent_id": "S250303bf",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T06:54:22.069437Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T06:54:22.069465Z",
"modified": "2025-03-03T06:54:22.074332Z"
}
}
],
"references": []
},
{
"event_id": "S250303bm",
"sequences": [
{
"id": 8228,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185020,
"topic": "igwn.gwalert",
"uuid": "8fa5825a-1cab-4131-9463-687b1a0d04cf",
"title": "S250303bm - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303bm/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303bm/view/"
},
"event": {
"far": 1.72878e-06,
"time": "2025-03-03T07:34:29.151Z",
"group": "Burst",
"search": "AllSky",
"area_50": 145.19780062153188,
"area_90": 1892.6071699511815,
"duration": 0.001837,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "9831b04bf103f042508c9d3a959ea7db",
"classification": {},
"skymap_version": 0,
"central_frequency": 416.121338
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-03T07:36:09Z",
"superevent_id": "S250303bm",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T07:36:09.887597Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T07:36:09.887635Z",
"modified": "2025-03-03T07:36:09.896345Z"
}
},
{
"id": 8229,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185021,
"topic": "igwn.gwalert",
"uuid": "91e07704-1e42-4f71-9b95-b58722325933",
"title": "S250303bm - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303bm/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303bm/view/"
},
"event": {
"far": 1.72878e-06,
"time": "2025-03-03T07:34:29.151Z",
"group": "Burst",
"search": "AllSky",
"area_50": 145.19780062153188,
"area_90": 1892.6071699511815,
"duration": 0.001837,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "9831b04bf103f042508c9d3a959ea7db",
"classification": {},
"skymap_version": 0,
"central_frequency": 416.121338
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-03T07:40:44Z",
"superevent_id": "S250303bm",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T07:40:45.988205Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T07:40:45.988233Z",
"modified": "2025-03-03T07:40:45.995172Z"
}
}
],
"references": []
},
{
"event_id": "S250221gb",
"sequences": [
{
"id": 8018,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 181559,
"topic": "igwn.gwalert",
"uuid": "a9c69f7b-7d10-4c79-a914-04df3aace065",
"title": "S250221gb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250221gb/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250221gb/view/"
},
"event": {
"far": 7.814327e-09,
"time": "2025-02-21T17:53:53.805Z",
"group": "CBC",
"search": "AllSky",
"area_50": 397.510452713139,
"area_90": 1337.2046002326917,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.09748345496093175,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": true,
"skymap_hash": "7e34d384adf578aa7941b11b5be421b2",
"classification": {
"BBH": 0.984748389,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.015251611
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-02-21T17:54:27Z",
"superevent_id": "S250221gb",
"external_coinc": null
},
"message_text": "",
"published": "2025-02-21T17:54:28.912416Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-02-21T17:54:28.912460Z",
"modified": "2025-02-21T17:54:28.920530Z"
}
},
{
"id": 8019,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 181560,
"topic": "igwn.gwalert",
"uuid": "a9439820-374d-46e5-94da-1b0629796efa",
"title": "S250221gb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250221gb/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250221gb/view/"
},
"event": {
"far": 7.814327e-09,
"time": "2025-02-21T17:53:53.805Z",
"group": "CBC",
"search": "AllSky",
"area_50": 397.510452713139,
"area_90": 1337.2046002326917,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.09748345496093175,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": true,
"skymap_hash": "7e34d384adf578aa7941b11b5be421b2",
"classification": {
"BBH": 0.984748389,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.015251611
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-02-21T17:59:03Z",
"superevent_id": "S250221gb",
"external_coinc": null
},
"message_text": "",
"published": "2025-02-21T17:59:04.835109Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-02-21T17:59:04.835140Z",
"modified": "2025-02-21T17:59:04.846223Z"
}
},
{
"id": 8020,
"sequence_number": 3,
"sequence_type": "RETRACTION",
"message": {
"id": 181561,
"topic": "igwn.gwalert",
"uuid": "3fbf25a1-689c-401e-a94f-b844d92b66f5",
"title": "S250221gb - RETRACTION",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250221gb/view/"
},
"event": null,
"alert_type": "RETRACTION",
"sequence_num": 3,
"time_created": "2025-02-21T18:16:23Z",
"superevent_id": "S250221gb",
"external_coinc": null
},
"message_text": "",
"published": "2025-02-21T18:16:24.474153Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-02-21T18:16:24.474186Z",
"modified": "2025-02-21T18:16:24.484362Z"
}
}
],
"references": [
{
"id": 185038,
"topic": "gcn.circulars",
"uuid": "9c55a456-2844-46a0-8787-d1c9a4dcb540",
"title": "LIGO/Virgo/KAGRA S250221gb: Retraction of GW compact binary merger candidate",
"submitter": "Isaac McMahon at University of Zurich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zurich <isaac.mcmahon@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39411"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39411....1L",
"eventId": "LIGO/Virgo/KAGRA S250221gb",
"subject": "LIGO/Virgo/KAGRA S250221gb: Retraction of GW compact binary merger candidate",
"createdOn": 1740161993864,
"submitter": "Isaac McMahon at University of Zurich <isaac.mcmahon@ligo.org>",
"circularId": 39411,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nThe trigger S250221gb is no longer considered to be a candidate of interest: there was a transient noise glitch in the LIGO Hanford detector.",
"published": "2025-03-03T08:08:32.126595Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:32.126613Z",
"modified": "2025-03-03T08:08:32.133284Z",
"targets": []
},
{
"id": 181562,
"topic": "gcn.circulars",
"uuid": "8e757fc3-a9a1-4d21-94f8-65773b2849a7",
"title": "LIGO/Virgo/KAGRA S250221gb: Retraction of GW compact binary merger candidate",
"submitter": "Isaac McMahon at University of Zurich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zurich <isaac.mcmahon@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39411"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250221gb",
"subject": "LIGO/Virgo/KAGRA S250221gb: Retraction of GW compact binary merger candidate",
"createdOn": 1740161993864,
"submitter": "Isaac McMahon at University of Zurich <isaac.mcmahon@ligo.org>",
"circularId": 39411,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nThe trigger S250221gb is no longer considered to be a candidate of interest: there was a transient noise glitch in the LIGO Hanford detector.",
"published": "2025-02-21T18:20:21.731055Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-21T18:20:21.731085Z",
"modified": "2025-02-21T18:20:21.740195Z",
"targets": []
}
]
},
{
"event_id": "S250302av",
"sequences": [
{
"id": 8199,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184804,
"topic": "igwn.gwalert",
"uuid": "6c4961f6-b31c-436e-9ff9-b155a7a517df",
"title": "S250302av - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250302av/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250302av/view/"
},
"event": {
"far": 2.105436045881065e-05,
"time": "2025-03-02T14:05:35.156Z",
"group": "CBC",
"search": "AllSky",
"area_50": 419.22717578297795,
"area_90": 1686.9802268744456,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.4908114635841918,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "1e31f43082203a7e10d8f5982e19e761",
"classification": {
"BBH": 0.0,
"BNS": 0.0026316312289025984,
"NSBH": 0.0,
"Terrestrial": 0.9973683687710974
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-02T14:06:00Z",
"superevent_id": "S250302av",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T14:06:01.366014Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T14:06:01.366040Z",
"modified": "2025-03-02T14:06:01.376561Z"
}
},
{
"id": 8200,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 184805,
"topic": "igwn.gwalert",
"uuid": "eef5a388-d7cf-4455-b91e-595994f31c92",
"title": "S250302av - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250302av/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250302av/view/"
},
"event": {
"far": 2.105436045881065e-05,
"time": "2025-03-02T14:05:35.156Z",
"group": "CBC",
"search": "AllSky",
"area_50": 419.22717578297795,
"area_90": 1686.9802268744456,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.4908114635841918,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "1e31f43082203a7e10d8f5982e19e761",
"classification": {
"BBH": 0.0,
"BNS": 0.0026316312289025984,
"NSBH": 0.0,
"Terrestrial": 0.9973683687710974
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-02T14:10:37Z",
"superevent_id": "S250302av",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-02T14:10:38.644210Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-02T14:10:38.644265Z",
"modified": "2025-03-02T14:10:38.657071Z"
}
}
],
"references": [
{
"id": 185242,
"topic": "gcn.circulars",
"uuid": "5b1caa6f-e36e-40d2-84fd-408525c779fe",
"title": "LIGO/Virgo/KAGRA S250302av: 2 counterpart neutrino candidate events from an IceCube neutrino search",
"submitter": "Zsuzsa Marka at IceCube/Columbia University <zsuzsa@astro.columbia.edu>",
"authors": "Zsuzsa Marka at IceCube/Columbia University <zsuzsa@astro.columbia.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39571"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250302av",
"subject": "LIGO/Virgo/KAGRA S250302av: 2 counterpart neutrino candidate events from an IceCube neutrino search",
"createdOn": 1741009897205,
"submitter": "Zsuzsa Marka at IceCube/Columbia University <zsuzsa@astro.columbia.edu>",
"circularId": 39571,
"submittedHow": "web"
},
"message_text": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nWe have performed a search for track-like muon neutrino candidate events detected by IceCube consistent with the sky localization of the low-significance gravitational-wave candidate event S250302av in a time range of 1000 seconds centered on the alert event time (2025-03-02 13:57:15 UTC to 2025-03-02 14:13:55 UTC) [1,2]. During this time period, IceCube was collecting good quality data. A single hypothesis test was conducted using a Bayesian approach to quantify the joint GW + neutrino event significance, which assumes a binary merger scenario and accounts for known astrophysical priors, such as GW source distance, in the statistical significance estimation [3]. \n\nTwo track-like events were found in spatial and temporal coincidence with the gravitational-wave candidate S250302av calculated from the map circulated in the S250302av-2-Preliminary notice. This represents an overall p-value of 0.0084 for the Bayesian search. The p-value measures the consistency of the observed track-like events with the known atmospheric backgrounds for this single map (not accounting for statistical trials from multiple GW events). \n\nFurther details are available at https://gcn.nasa.gov/missions/icecube and at https://roc.icecube.wisc.edu/public/LvkNuTrackSearch.\n\nProperties of the coincident event are shown below:\n\n dt(s) RA(deg) Dec(deg) Angular uncertainty(deg) p-value(Bayesian)\n-------------------------------------------------------------------------------------\n 76.86 114.87\t 3.25 \t1.16\t\t\t0.0298\n 211.98 191.11\t 58.45 \t5.39\t\t\t0.0137\n\nwhere:\ndt = Time of track event minus time of GW trigger (sec)\nAngular uncertainty = Angular uncertainty of track event: the radius of a circle \n representing 90% CL containment by area.\np-value = the individual p-value for the specific track event from this search.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the \ngeographic South Pole, Antarctica. The IceCube realtime alert point of contact can be \nreached at roc@icecube.wisc.edu\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n[3] I. Bartos et al. 2019 Phys. Rev. D 100, 083017\n",
"published": "2025-03-03T13:52:50.411468Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T13:52:50.411504Z",
"modified": "2025-03-03T13:52:50.459793Z",
"targets": []
}
]
},
{
"event_id": "S250303ec",
"sequences": [
{
"id": 8232,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185317,
"topic": "igwn.gwalert",
"uuid": "67be9221-b606-4125-88d9-3b8e1f0fa25b",
"title": "S250303ec - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303ec/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303ec/view/"
},
"event": {
"far": 2.061181e-05,
"time": "2025-03-03T19:49:31.420Z",
"group": "CBC",
"search": "AllSky",
"area_50": 391.84522060796365,
"area_90": 1503.3847419845026,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.1979346870959936,
"HasRemnant": 0.8529913917316075
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "d339a3b413bb7d2026180b47d7bed430",
"classification": {
"BBH": 0.0,
"BNS": 0.000100954,
"NSBH": 0.000513948,
"Terrestrial": 0.999385098
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-03T19:50:00Z",
"superevent_id": "S250303ec",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T19:50:01.579692Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T19:50:01.579744Z",
"modified": "2025-03-03T19:50:01.592478Z"
}
},
{
"id": 8233,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185318,
"topic": "igwn.gwalert",
"uuid": "6cb06901-06e0-4542-95c2-7274d2d9d992",
"title": "S250303ec - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303ec/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303ec/view/"
},
"event": {
"far": 2.061181e-05,
"time": "2025-03-03T19:49:31.420Z",
"group": "CBC",
"search": "AllSky",
"area_50": 391.84522060796365,
"area_90": 1503.3847419845026,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.1979346870959936,
"HasRemnant": 0.8529913917316075
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "d339a3b413bb7d2026180b47d7bed430",
"classification": {
"BBH": 0.0,
"BNS": 0.000100954,
"NSBH": 0.000513948,
"Terrestrial": 0.999385098
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-03T19:54:35Z",
"superevent_id": "S250303ec",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T19:54:36.643533Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T19:54:36.643580Z",
"modified": "2025-03-03T19:54:36.649254Z"
}
}
],
"references": []
},
{
"event_id": "S250223dk",
"sequences": [
{
"id": 8084,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 182151,
"topic": "igwn.gwalert",
"uuid": "29c3a64e-7d81-4284-8d69-f6c32c2670a2",
"title": "S250223dk - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250223dk/view/"
},
"event": {
"far": 1.31340700698367e-05,
"time": "2025-02-23T12:01:15.361Z",
"group": "CBC",
"search": "AllSky",
"area_50": 718.2255368894562,
"area_90": 3090.2792016675166,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "cb68b9326aabf0500245e8944d14b58f",
"classification": {
"BBH": 0.0854210967126608,
"BNS": 2.720232608718446e-16,
"NSBH": 1.9596802512612448e-14,
"Terrestrial": 0.9145789032873193
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-02-23T12:02:29Z",
"superevent_id": "S250223dk",
"external_coinc": null
},
"message_text": "",
"published": "2025-02-23T12:02:30.685578Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-02-23T12:02:30.685609Z",
"modified": "2025-02-23T12:02:30.697629Z"
}
},
{
"id": 8085,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 182152,
"topic": "igwn.gwalert",
"uuid": "a75695d2-6a3d-403d-b34f-232a68794342",
"title": "S250223dk - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250223dk/view/"
},
"event": {
"far": 1.443192990183262e-05,
"time": "2025-02-23T12:01:15.360Z",
"group": "CBC",
"search": "AllSky",
"area_50": 726.6184733415679,
"area_90": 3202.7445501258135,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "9c1588dc600f3ff7af7dc00a0f0d7cd1",
"classification": {
"BBH": 0.07988696763057104,
"BNS": 1.8525508826436897e-16,
"NSBH": 1.3367669431353486e-14,
"Terrestrial": 0.9201130323694154
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-02-23T12:07:05Z",
"superevent_id": "S250223dk",
"external_coinc": null
},
"message_text": "",
"published": "2025-02-23T12:07:05.894516Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-02-23T12:07:05.894548Z",
"modified": "2025-02-23T12:07:05.905449Z"
}
},
{
"id": 8102,
"sequence_number": 3,
"sequence_type": "PRELIMINARY",
"message": {
"id": 182373,
"topic": "igwn.gwalert",
"uuid": "203d3063-215b-4e65-9b8a-c49b605a96bb",
"title": "S250223dk - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250223dk/view/",
"combined_skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/combined-ext.multiorder.fits,2"
},
"event": {
"far": 1.443192990183262e-05,
"time": "2025-02-23T12:01:15.360Z",
"group": "CBC",
"search": "AllSky",
"area_50": 726.6184733415679,
"area_90": 3202.7445501258135,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": true,
"skymap_hash": "9c1588dc600f3ff7af7dc00a0f0d7cd1",
"classification": {
"BBH": 0.07988696763057104,
"BNS": 1.8525508826436897e-16,
"NSBH": 1.3367669431353486e-14,
"Terrestrial": 0.9201130323694154
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 3,
"time_created": "2025-02-24T00:24:06Z",
"superevent_id": "S250223dk",
"external_coinc": {
"ivorn": "ivo://lvk.internal/swift#targeted_subthreshold-2025-02-23T12:01:13.313Z",
"search": "SubGRBTargeted",
"observatory": "Swift",
"gcn_notice_id": 762004910,
"time_difference": 2.05,
"combined_skymap_hash": "54cb9c3477570c1e04947d486c5d84cb",
"time_coincidence_far": 1.9333346536574795e-07,
"combined_skymap_version": 2,
"time_sky_position_coincidence_far": -1.3348699856778114e-05
}
},
"message_text": "",
"published": "2025-02-24T00:24:08.331468Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-02-24T00:24:08.331513Z",
"modified": "2025-02-24T00:24:08.345489Z"
}
},
{
"id": 8103,
"sequence_number": 4,
"sequence_type": "PRELIMINARY",
"message": {
"id": 182383,
"topic": "igwn.gwalert",
"uuid": "8b20162f-74ca-4759-a47c-9f4f2623e3a7",
"title": "S250223dk - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250223dk/view/",
"combined_skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/combined-ext.multiorder.fits,2"
},
"event": {
"far": 1.443192990183262e-05,
"time": "2025-02-23T12:01:15.360Z",
"group": "CBC",
"search": "AllSky",
"area_50": 726.6184733415679,
"area_90": 3202.7445501258135,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": true,
"skymap_hash": "9c1588dc600f3ff7af7dc00a0f0d7cd1",
"classification": {
"BBH": 0.07988696763057104,
"BNS": 1.8525508826436897e-16,
"NSBH": 1.3367669431353486e-14,
"Terrestrial": 0.9201130323694154
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 4,
"time_created": "2025-02-24T00:28:48Z",
"superevent_id": "S250223dk",
"external_coinc": {
"ivorn": "ivo://lvk.internal/swift#targeted_subthreshold-2025-02-23T12:01:13.313Z",
"search": "SubGRBTargeted",
"observatory": "Swift",
"gcn_notice_id": 762004910,
"time_difference": 2.05,
"combined_skymap_hash": "54cb9c3477570c1e04947d486c5d84cb",
"time_coincidence_far": 1.9333346536574795e-07,
"combined_skymap_version": 2,
"time_sky_position_coincidence_far": -1.3348699856778114e-05
}
},
"message_text": "",
"published": "2025-02-24T00:28:50.095021Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-02-24T00:28:50.095067Z",
"modified": "2025-02-24T00:28:50.105241Z"
}
},
{
"id": 8104,
"sequence_number": 5,
"sequence_type": "PRELIMINARY",
"message": {
"id": 182397,
"topic": "igwn.gwalert",
"uuid": "63ea8771-fa59-4ab4-b6c7-6e3b093fba7e",
"title": "S250223dk - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250223dk/view/",
"combined_skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/combined-ext.multiorder.fits,2"
},
"event": {
"far": 1.443192990183262e-05,
"time": "2025-02-23T12:01:15.360Z",
"group": "CBC",
"search": "AllSky",
"area_50": 726.6184733415679,
"area_90": 3202.7445501258135,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": true,
"skymap_hash": "9c1588dc600f3ff7af7dc00a0f0d7cd1",
"classification": {
"BBH": 0.07988696763057104,
"BNS": 1.8525508826436897e-16,
"NSBH": 1.3367669431353486e-14,
"Terrestrial": 0.9201130323694154
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 5,
"time_created": "2025-02-24T01:11:00Z",
"superevent_id": "S250223dk",
"external_coinc": {
"ivorn": "ivo://lvk.internal/swift#targeted_subthreshold-2025-02-23T12:01:13.313Z",
"search": "SubGRBTargeted",
"observatory": "Swift",
"gcn_notice_id": 762004910,
"time_difference": 2.05,
"combined_skymap_hash": "54cb9c3477570c1e04947d486c5d84cb",
"time_coincidence_far": 1.9333346536574795e-07,
"combined_skymap_version": 2,
"time_sky_position_coincidence_far": 5.123426111237464e-09
}
},
"message_text": "",
"published": "2025-02-24T01:11:01.902554Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-02-24T01:11:01.905081Z",
"modified": "2025-02-24T01:11:01.910954Z"
}
},
{
"id": 8107,
"sequence_number": 6,
"sequence_type": "INITIAL",
"message": {
"id": 182411,
"topic": "igwn.gwalert",
"uuid": "86406f56-d6ed-4252-9c9e-1148f25e40ab",
"title": "S250223dk - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250223dk/view/",
"combined_skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/combined-ext.multiorder.fits,2"
},
"event": {
"far": 1.443192990183262e-05,
"time": "2025-02-23T12:01:15.360Z",
"group": "CBC",
"search": "AllSky",
"area_50": 726.6184733415679,
"area_90": 3202.7445501258135,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": true,
"skymap_hash": "9c1588dc600f3ff7af7dc00a0f0d7cd1",
"classification": {
"BBH": 0.07988696763057104,
"BNS": 1.8525508826436897e-16,
"NSBH": 1.3367669431353486e-14,
"Terrestrial": 0.9201130323694154
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 6,
"time_created": "2025-02-24T03:05:57Z",
"superevent_id": "S250223dk",
"external_coinc": {
"ivorn": "ivo://lvk.internal/swift#targeted_subthreshold-2025-02-23T12:01:13.313Z",
"search": "SubGRBTargeted",
"observatory": "Swift",
"gcn_notice_id": 762004910,
"time_difference": 2.05,
"combined_skymap_hash": "54cb9c3477570c1e04947d486c5d84cb",
"time_coincidence_far": 1.9333346536574795e-07,
"combined_skymap_version": 2,
"time_sky_position_coincidence_far": 5.123426111237464e-09
}
},
"message_text": "",
"published": "2025-02-24T03:05:58.466988Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-02-24T03:05:58.467019Z",
"modified": "2025-02-24T03:05:58.475540Z"
}
},
{
"id": 8128,
"sequence_number": 7,
"sequence_type": "UPDATE",
"message": {
"id": 183565,
"topic": "igwn.gwalert",
"uuid": "ed49655e-d8b7-4370-abbd-bc2cf8854b83",
"title": "S250223dk - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S250223dk/view/",
"combined_skymap": "https://gracedb.ligo.org/api/superevents/S250223dk/files/combined-ext.multiorder.fits,2"
},
"event": {
"far": 1.443192990183262e-05,
"time": "2025-02-23T12:01:15.360Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1329.8607808370941,
"area_90": 18316.74451308851,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": true,
"skymap_hash": "c27fe89d0ef78b9c8a6a2320dcad8f14",
"classification": {
"BBH": 0.07988696763057104,
"BNS": 1.8525508826436897e-16,
"NSBH": 1.3367669431353486e-14,
"Terrestrial": 0.9201130323694154
},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 7,
"time_created": "2025-02-26T16:57:35Z",
"superevent_id": "S250223dk",
"external_coinc": {
"ivorn": "ivo://lvk.internal/swift#targeted_subthreshold-2025-02-23T12:01:13.313Z",
"search": "SubGRBTargeted",
"observatory": "Swift",
"gcn_notice_id": 762004910,
"time_difference": 2.05,
"combined_skymap_hash": "d44864ae352ae6940e5cd16f20372645",
"time_coincidence_far": 1.9333346536574795e-07,
"combined_skymap_version": 2,
"time_sky_position_coincidence_far": 5.123426111237464e-09
}
},
"message_text": "",
"published": "2025-02-26T16:57:39.327970Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-02-26T16:57:39.328002Z",
"modified": "2025-02-26T16:57:39.337898Z"
}
}
],
"references": [
{
"id": 185319,
"topic": "gcn.circulars",
"uuid": "c50a41cb-a243-421a-9244-5760c8034841",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Swift/UVOT Upper Limits",
"submitter": "noelklin@umbc.edu",
"authors": "noelklin@umbc.edu",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39577"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Swift/UVOT Upper Limits",
"createdOn": 1741031729332,
"submitter": "noelklin@umbc.edu",
"circularId": 39577,
"submittedHow": "web"
},
"message_text": "Noel Klingler (NASA-GSFC / UMBC / CRESST II), Sam Shilling (Lancaster U.), P.A. Evans (U. Leicester), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), S.B. Cenko (NASA/GSFC), R.A.J. Eyles-Ferris (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), A.A. Breeveld (UCL-MSSL), S. Campana (INAF-OAB), J.J. Delaunay (PSU), M. De Pasquale (University of Messina), S. Dichiara (PSU), P. D'Avanzo (INAF-OAB), A. D'Aì (INAF-IASFPA) , V. D'Elia (ASI-SSDC & INAF-OAR), C. Gronwall (PSU), D. Hartmann (Clemson University), N. Klingler (NASA-GSFC / UMBC / CRESST II), N.P.M. Kuin (UCL-MSSL), S. Laha (NASA/GSFC), S.R. Oates (U. Birmingham), J.P. Osborne (U. Leicester), P. O'Brien (U. Leicester), M.J. Page (UCL-MSSL), S. Ronchini (PSU), T. Sbarrato (INAF-OAB), B. Sbarufatti (INAF-OAB), M.H. Siegel (PSU), G. Tagliaferri (INAF-OAB), E. Troja (U Tor Vergata, INAF) report on behalf of the Swift team:\n\nSwift/UVOT has carried out 1 observation of the combined LVK/Swift-BAT-GUANO error region for the GW trigger S250223dk (GCN 39443), centered on the most-probable location (RA,Dec = 85.4260, -47.5420 [J2000]; GCN 39485). UVOT collected 4.9 ks of data from 106 ks to 140 ks after the LVK trigger, using the White filter.\n\nFor the X-ray sources reported by Evans et al. (GCN 39485): X1, X5, and X6 are outside of the UVOT field of view. X2 is not detected, with a 3 sigma detection limit > 21.54 mag (AB). X3 is not detected, with a 3 sigma detection limit > 23.01 mag (AB). X7 is not detected, with a 3 sigma detection limit > 23.09 (AB). X4 is detected (20.14 +/- 0.03 mag, AB) but its position is coincident with a known source (classified as an AGN in the AllWISE catalog), WISEA J054219.27-473400.6.\n\nNo uncatalogued/transient sources are detected, with an average 3 sigma limit > 23.0 mag (AB) over the UVOT field of view.",
"published": "2025-03-03T19:56:47.340851Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T19:56:47.340873Z",
"modified": "2025-03-03T19:56:47.346087Z",
"targets": []
},
{
"id": 185131,
"topic": "gcn.circulars",
"uuid": "ac920737-ccf3-4452-a7c4-f208ae309db4",
"title": "LIGO/Virgo S250223dk: Swift XRT observations, 7 X-ray sources",
"submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39485"
},
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39485....1E",
"eventId": "LIGO/Virgo S250223dk",
"subject": "LIGO/Virgo S250223dk: Swift XRT observations, 7 X-ray sources",
"createdOn": 1740558785504,
"submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"circularId": 39485,
"submittedHow": "email"
},
"message_text": "P.A. Evans (U. Leicester), J.J. Delaunay (PSU), K.L. Page (U.\nLeicester), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), S.B. Cenko\n(NASA/GSFC), R.A.J. Eyles-Ferris (U. Leicester), A.P. Beardmore (U.\nLeicester), M.G. Bernardini (INAF-OAB), A.A. Breeveld (UCL-MSSL), S.\nCampana (INAF-OAB), M. De Pasquale (University of Messina), S. Dichiara\n(PSU), P. D’Avanzo (INAF-OAB), A. D’Aì (INAF-IASFPA) , V. D’Elia\n(ASI-SSDC & INAF-OAR), C. Gronwall (PSU), D. Hartmann (Clemson\nUniversity), N. Klingler (NASA-GSFC / UMBC / CRESST II), N.P.M. Kuin\n(UCL-MSSL), S. Laha (NASA/GSFC), S.R. Oates (U. Birmingham), J.P.\nOsborne (U. Leicester), P. O’Brien (U. Leicester), M.J. Page\n(UCL-MSSL), G. Raman (PSU) S. Ronchini (PSU), T. Sbarrato (INAF-OAB),\nB. Sbarufatti (INAF-OAB), M.H. Siegel (PSU), G. Tagliaferri (INAF-OAB),\nE. Troja (U Tor Vergata, INAF) report on behalf of the Swift team:\n\nSwift has carried out 1 observation of the combined LVK/Swift-BAT-GUANO\nerror region for the GW trigger S250223dk, centred on the most-probable\nlocation (RA,Dec = 85.4260, -47.5420 [J2000]). We gathered 5.5 ks of\ndata from 106 ks to 140 ks after the LVK trigger. This observations\ncovers 73% of the probability in the combined skymap.\n\nWe have detected 7 X-ray sources. Each source is assigned a rank of 1-4\nwhich describes how likely it is to be related to the GW trigger, with\n1 being the most likely and 4 being the least likely. The ranks are\ndescribed at https://www.swift.ac.uk/ranks.php.\n\nWe have found:\n\n * 0 sources of rank 1\n * 0 sources of rank 2\n * 7 sources of rank 3\n * 0 sources of rank 4\n\n\nRANK 3 sources\n==============\n\nThese are uncatalogued X-ray sources, however they are not brighter\nthan previous upper limits, so do not stand out as likely counterparts\nto the GW trigger.\n\n| Source ID\t | RA\t\t | Dec \t | Err90 |\n| S250223dk_X1 | 05h 41m 59.75s | -47d 21' 33.8\" |\t6.8\" |\n| S250223dk_X2 | 05h 42m 11.19s | -47d 23' 57.3\" |\t6.4\" |\n| S250223dk_X3 | 05h 41m 58.45s | -47d 33' 26.5\" |\t6.5\" |\n| S250223dk_X4 | 05h 42m 19.59s | -47d 34' 02.3\" |\t6.9\" |\n| S250223dk_X5 | 05h 42m 03.87s | -47d 42' 35.1\" |\t6.4\" |\n| S250223dk_X6 | 05h 42m 01.25s | -47d 43' 06.8\" |\t6.3\" |\n| S250223dk_X7 | 05h 41m 25.44s | -47d 26' 58.1\" |\t6.4\" |\n\nFor all flux conversions and comparisons with catalogues and upper\nlimits from other missions, we assumed a power-law spectrum with\nNH=3x10^20 cm^-2, and photon index (Gamma)=1.7, unless otherwise\nstated.\n\nThe results of the XRT automated analysis, including details of the\nsources listed above, are online at\nhttps://www.swift.ac.uk/LVC/S250223dk\n\nThis circular is an official product of the Swift XRT team.\n\n\n",
"published": "2025-03-03T08:08:34.413174Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:34.413191Z",
"modified": "2025-03-03T08:08:34.417553Z",
"targets": []
},
{
"id": 185127,
"topic": "gcn.circulars",
"uuid": "87b01e3a-39a3-43d8-af46-56a1e784d2af",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Updated Sky localization and Coincidence with External Event",
"submitter": "ethan.payne@ligo.org",
"authors": "ethan.payne@ligo.org",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39499"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39499....1L",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Updated Sky localization and Coincidence with External Event",
"createdOn": 1740594413278,
"submitter": "ethan.payne@ligo.org",
"circularId": 39499,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration along with the Swift/BAT-GUANO team report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250223dk (GCN Circular 39443). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S250223dk\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 18323 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 9589 +/- 6347 Mpc (a posteriori mean +/- standard deviation).\n\nA search performed by the RAVEN pipeline [2] found a temporal coincidence between S250223dk and a sub-threshold Swift/BAT trigger with ID 762004910 (GCN circular 39443). The GRB trigger time is 10.24 seconds before the GW candidate event. The estimated joint false alarm rate for the coincidence using just timing info is 1.9e-07 Hz, or about one in a month. The GRB candidate was found during a joint targeted search between the LIGO/Virgo/KAGRA collaboration and Swift/BAT-GUANO, and has a false alarm rate of 7.4e-05 Hz, or about one in 3 hours. RAVEN has also identified an additional detection from Fermi GBM.\n\nCombined sky maps are also available:\n * combined-ext.multiorder.fits,0, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,1, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,2, an initial localization, distributed via GCN notice about 13 hours after the candidate event time.\n * combined-ext.multiorder.fits,3, an initial localization, distributed via GCN notice about 15 hours after the candidate event time.\n * combined-ext.multiorder.fits,5, an updated localization, distributed via GCN notice about 3 days after the candidate event time.\n\nThe joint LVK-Swift/BAT localization probability map peaks at\nRA = 85.341 deg, \nDec = -47.554 deg. \nA circle with a radius of 10 arcmin around this position contains 52% of the integrated joint probability.\n\nFor the combined-ext.multiorder.fits,5 sky map, the 90% credible region is 1 deg2. Considering the overlap of the individual sky maps, the estimated joint false alarm rate for the spatial and temporal coincidence is 1.7e-08 Hz, or about one in 2 years. After considering trials factors, this means the joint FAR is larger than the ‘'high significance’' alert threshold and this joint event is no longer considered significant.\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. (2023) arXiv:2307.13380\n [2] Urban, A. L. 2016, Ph.D. Thesis https://dc.uwm.edu/etd/1218 and Piotrzkowski, B. J. 2022, Ph.D. Thesis https://dc.uwm.edu/etd/3060\n",
"published": "2025-03-03T08:08:34.351154Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:34.351183Z",
"modified": "2025-03-03T08:08:34.355597Z",
"targets": []
},
{
"id": 185125,
"topic": "gcn.circulars",
"uuid": "f4eb2e24-bebc-4f28-ab44-9a4e882ec2f4",
"title": "LIGO/Virgo/KAGRA S250223dk: Insight-HXMT/HE sub-threshold detection of a burst (HEB 250223501)",
"submitter": "yqzhang_cl@163.com",
"authors": "yqzhang_cl@163.com",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39508"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39508....1C",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk: Insight-HXMT/HE sub-threshold detection of a burst (HEB 250223501)",
"createdOn": 1740625618610,
"submitter": "yqzhang_cl@163.com",
"circularId": 39508,
"submittedHow": "web"
},
"message_text": "Ce Cai (HEBNU), Shao-Lin Xiong, Xiao-Bo Li, Shu-Xu Yi, Shuang-Nan Zhang (IHEP) report on behalf of the Insight-HXMT team:\n\nAt the event time (T0 = 2025-02-23T12:01:15.360 UTC) of the LIGO/Virgo/KAGRA S250223dk event, which was reported to be possibly associated with a sub-threshold burst candidate by Swift/BAT (GCN 39443, 39499), Insight-HXMT was observing 99.97% of the localization probability region based on the combined skymap and there is no Insight-HXMT/HE triggers from the on-ground automated blind search around this event. \n\nThus, we implemented a targeted search [1] for sub-threshold burst signals within the window of T0+/-30 s using the central region of the joint LVK-Swift/BAT localization probability map (i.e. RA = 85.341 deg, Dec = -47.554 deg) and three types of GRB spectra. Our targeted search detected a burst candidate (named as HEB 250223501) with about 4 sigma on the 1-second timescale, starting at T0 - 9.50 s. We note that the time of this Insight-HXMT/HE burst candidate is well consistent with the start time of the Swift/BAT candidate (T0 - 10.240 s, GCN 39443), but the duration is much shorter, which could be explained as the detection energy band of Insight-HXMT/HE is higher than that of Swift/BAT in terms of GRB observation.\n\nWe note that these results are very preliminary. Refined analysis will be reported later.\n\nInsight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://hxmten.ihep.ac.cn/.\n\n[1] Cai, C., Xiong, S. L., Li, C. K., et al. 2021, MNRAS, 508, 3910S\n",
"published": "2025-03-03T08:08:34.318470Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:34.318488Z",
"modified": "2025-03-03T08:08:34.322639Z",
"targets": []
},
{
"id": 185119,
"topic": "gcn.circulars",
"uuid": "af32919a-1aec-4dcc-b869-5716cd8f5b68",
"title": "LIGO/Virgo/KAGRA S250223dk: DECam DESGW Candidates",
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39462"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39462....1M",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk: DECam DESGW Candidates",
"createdOn": 1740436576252,
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"circularId": 39462,
"submittedHow": "web"
},
"message_text": "I. McMahon (UZH), S. MacBride (UZH), H. T. Diehl (FNAL), S. Kaur (UZH), L. Joseph (Benedictine U.), N. Sherman (Boston U.), K. Herner (Fermilab), M. Soares-Santos (UZH), reporting on behalf of the Dark Energy Survey Gravitational Wave (DESGW) Team:\n\nAt 03:45:38 UTC, the Dark Energy Camera (DECam) began observing in response to the joint LVK/Swift-BAT RAVEN alert issued for the candidate gravitational-wave event S250223dk (GCN 39443). We observed two fields centered on the following ICRS coordinates\n(85.80,-47.60)\n(85.83,-47.63)\nBoth fields were observed in DECam g, r, i, and z filters with 360 second exposures. The limiting magnitude achieved is 23.36 in r-band. \n\nImages were processed by our difference imaging pipeline (Herner et al. 2020) using DES and public DECam images as templates. We employ the autoscan machine learning code (Goldstein et al. 2015) to reject subtraction artifacts. Candidates were initially selected by requiring at least two high signal to noise detections, which were separated in time in order to reject moving objects. We also require an autoscan score of at least 0.7 on at least one of those detections. \n\nAfter candidate selection, we report five high confidence candidates (listed below). After vetting and identification, four candidates were classified as nuclear candidates (likely AGNs), one candidate (2017239) has been labeled as a possible supernova. All candidates have a host galaxy match within 1 arcsecond. None of the candidate hosts are included in the ALLWISE and MILLIQUAS AGN catalogs (Secrest et. al 2015, Flesch 2023). No other candidates were found in the area. We encourage followup of the five candidates identified herein. \n\n| id | AT name | ra | dec | discovery_date (UT) | mag_g | mag_g_err | mag_r | mag_r_err | mag_i | mag_i_err | mag_z | mag_z_err |\n| --------------- | ---------- | ---------- | ---------- | ----------------------- | ------ | ----- | ------ | ----- | ------ | ----- | ------ | ----- |\n| 2014974 | AT2025cpl | 86.327994 | -47.827215 | 2025-02-24 03:45:38.271 | 22.487 | 0.043 | 22.151 | 0.031 | 21.744 | 0.053 | 21.894 | 0.106 |\n| 2014991 | AT2025cpm | 86.516403 | -47.893872 | 2025-02-24 03:45:38.271 | 23.448 | 0.107 | 22.905 | 0.060 | 22.453 | 0.103 | 22.308 | 0.153 |\n| 2015571 | AT2025cpo | 86.105565 | -47.689987 | 2025-02-24 03:45:38.271 | 22.972 | 0.053 | N/A | N/A | 22.423 | 0.084 | 22.765 | 0.203 |\n| 2015600 | AT2025cpp | 86.176728 | -47.763957 | 2025-02-24 03:52:10.108 | 21.980 | 0.024 | N/A | N/A | 22.097 | 0.061 | 22.312 | 0.132 |\n| 2017239 | AT2025cpq | 85.552523 | -47.577823 | 2025-02-24 03:58:42.138 | 24.503 | 0.268 | 23.980 | 0.161 | 23.972 | 0.320 | 24.265 | 0.851 |\n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations.",
"published": "2025-03-03T08:08:34.225959Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:34.225978Z",
"modified": "2025-03-03T08:08:34.230118Z",
"targets": []
},
{
"id": 185112,
"topic": "gcn.circulars",
"uuid": "f2071187-e8ca-4214-ae1d-04d3098c23d9",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: DECam GW-MMADS candidates",
"submitter": "xjh@andrew.cmu.edu",
"authors": "xjh@andrew.cmu.edu",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39468"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39468....1H",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: DECam GW-MMADS candidates",
"createdOn": 1740466010500,
"submitter": "xjh@andrew.cmu.edu",
"circularId": 39468,
"submittedHow": "web"
},
"message_text": "Lei Hu (CMU), Xander J. Hall (CMU), Tomás Cabrera (CMU), Antonella Palmese (CMU), Igor Andreoni (UNC), Brendan O’Connor (CMU), Keerthi Kunnumkai (CMU), on behalf of the GW-MMADS team\n\nThe high probability area of the joint LVK/Swift-GUANO alert for the gravitational wave candidate S250223dk (GCN 39443) was observed using the wide-field Dark Energy Camera (DECam) on the 4m Blanco telescope by the Dark Energy Survey Gravitational Wave (DESGW) program (PI: Soares-Santos; GCN 39462). Observations started at 2025-02-24T03:45:38 on the night of the alert, and at 2025-02-25T00:50:13 on the following night. We find that the median 5sigma depths of the exposures are r\\~24.7 mag on the first night and r\\~24.9 mag on the second night. \n\nAs part of the Gravitational Wave Multi-Messenger Astronomy DECam Survey (GW-MMADS), we run the SFFT difference imaging (Hu et al. 2022) on the available images using templates from DES, filter out likely stars and moving objects, visually inspect the remaining transients. We posted on TNS new transients from this analysis and report here the most likely extragalactic transients we find within the joint LVK-GUANO skymap 95% credible interval area:\n\n| id | AT name | ra | dec | discovery_date (UT) | mag_r | mag_r_err | mag_r-mag_i |\n\n| ------------------------ | ---------- | ---------- | ---------- | ----------------------- | ------ | ----- | ----- |\n| C202502240542297m473928 | AT 2025cqb | 85.623700 | -47.657680 | 2025-02-24T03:58:42 | 23.04 | 0.05 | 0.20\n| C202502240549253m474247 | AT 2025cqf | 87.355530 | -47.713117 | 2025-02-24T03:58:42 | 24.44 | 0.20 | N/A\n| A202502240541155m473906* | AT 2025cpv | 85.314435 | -47.651722 | 2025-02-24T03:45:38 | 23.55 | 0.08 | 0.21\n| C202502240541459m473517 | AT 2025cql | 85.441205 | -47.588088 | 2025-02-24T04:24:50 | 24.77 | 0.25 | N/A\n| C202502240545203m483410 | AT 2025cqm | 86.334777 | -48.569306 | 2025-02-24T03:58:42 | 24.00 | 0.13 | N/A\n| T202502240543468m475332 | AT 2025cqc | 85.944938 | -47.892308 | 2025-02-24T03:45:38 | 23.00 | 0.05 | 0.21\n| C202502240544410m483014 | AT 2025cqe | 86.170896 | -48.503829 | 2025-02-24T03:58:42 | 23.75 | 0.10 | 0.49\n| A202502240546005m475901* | AT 2025cqd | 86.502090 | -47.983653 | 2025-02-24T03:45:38 | 22.48 | 0.03 | 0.23\n\n* Possible stellar origin\n\nMagnitudes reported are from the discovery date and not corrected from Milky Way extinction.\n\nFurther analysis is underway.\n\nWe thank the CTIO and NOIRLab staff for supporting observations and data calibration.\n\n\n",
"published": "2025-03-03T08:08:34.126532Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:34.126550Z",
"modified": "2025-03-03T08:08:34.130965Z",
"targets": []
},
{
"id": 185111,
"topic": "gcn.circulars",
"uuid": "914fb1ba-c07c-4a80-b454-68939dd799c6",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO trigger with ID 762004910: Identification of a GW compact binary merger candidate possibly associated with a sub-threshold Swift/BAT-GUANO trigger",
"submitter": "minghuidu1993@gmail.com",
"authors": "minghuidu1993@gmail.com",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39443"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39443....1L",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO trigger with ID 762004910: Identification of a GW compact binary merger candidate possibly associated with a sub-threshold Swift/BAT-GUANO trigger",
"version": 3,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Samuele Ronchini at PSU <sjs8171@psu.edu>",
"editedOn": 1740423239074,
"createdOn": 1740366735127,
"submitter": "minghuidu1993@gmail.com",
"circularId": 39443,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration along with the Swift/BAT-GUANO team report:\n\nWe identified the compact binary merger candidate S250223dk during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at T0 = 2025-02-23 12:01:15.360 UTC (GPS time: 1424347293.360). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS250223dk is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.4e-05 Hz, or about one in 19 hours. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250223dk\n\nThe classification of the GW signal, in order of descending probability, is Terrestrial (92%), BBH (8%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nFive GW-only sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN notice about a minute after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 5 minutes after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 12 hours after the candidate event time.\n * bayestar.multiorder.fits,3, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 12 hours after the candidate event time.\n * bayestar.multiorder.fits,4, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 13 hours after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,4. For the bayestar.multiorder.fits,4 sky map, the 90% credible region is 3203 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 6033 +/- 1778 Mpc (a posteriori mean +/- standard deviation).\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; [4]). \n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-45,+45] seconds around the time of the GW alert. All the requested event mode data was delivered to the ground. \n\nThe BAT likelihood search, NITRATES [5], performed on the temporal window [T0-20 s, T0+20 s], detects a burst candidate with a sqrt(TS) of 8.0 in a 8.192 s analysis time bin, starting at T0 - 10.240 s \n\nThe 90% credible area is 2666 deg2 and the 50% credible area is <1 deg2.\nThe integrated probability inside the coded field of view is 83%. \n\nThe joint LVK-Swift/BAT localization probability map peaks at \nRA = 85.341 deg,\nDec = -47.554 deg.\nA circle with a radius of 10 arcmin around this position contains 74% of the integrated joint probability.\n\nSwift has already initiated TOO followup of this position with XRT and UVOT. Results will be reported in future circulars. We encourage followup by other, more sensitive, facilities.\n\nA plot of the Swift/BAT probability skymap can be viewed here:\n\n[https://guano.swift.psu.edu/trigger_report?id=762004910/#:~:text=Probability%20Skymap](https://guano.swift.psu.edu/trigger_report?id=762004910/#:~:text=Probability%20Skymap)\n\nThe Swift/BAT probability skymap file can be downloaded from the link here:\n\n[https://guano.swift.psu.edu/files/762004910/0_n_PROBMAP](https://guano.swift.psu.edu/files/762004910/0_n_PROBMAP)\n\nInstructions on how to read and manipulate this map can be found here:\n\n[https://guano.swift.psu.edu/documentation](https://guano.swift.psu.edu/documentation)\n\nMore details about this burst can be found on the trigger report page here:\n\n[https://guano.swift.psu.edu/trigger_report?id=762004910](https://guano.swift.psu.edu/trigger_report?id=762004910)\n\n\nA search performed by the RAVEN pipeline [6] found a temporal coincidence between S250223dk and a sub-threshold Swift/BAT trigger with ID 762004910. The GRB trigger time is 10.24 seconds before the GW candidate event. The estimated joint false alarm rate for the coincidence using just timing info is 1.9e-07 Hz, or about one in a month. The GRB candidate was found during a joint targeted search between the LIGO/Virgo/KAGRA collaboration and Swift/BAT-GUANO, and has a false alarm rate of 7.4e-05 Hz, or about one in 3 hours.Combined sky maps are also available:\n * combined-ext.multiorder.fits,0, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,1, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,2, an initial localization, distributed via GCN notice about 13 hours after the candidate event time.\n\nFor the combined-ext.multiorder.fits,2 sky map, the 90% credible region is <1 deg2. The joint localization is dominated by the Swift/BAT-GUANO candidate. Considering the overlap of the individual sky maps, the estimated joint false alarm rate for the spatial and temporal coincidence is 5.1e-09 Hz, or about one in 6 years.\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625\n \n [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n \n [3] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n \n [4] Tohuvavohu et al. ApJ, 900, 1 (2020)\n \n [5] DeLaunay & Tohuvavohu, ApJ, 941, 169 (2022)\n \n [6] Urban, A. L. 2016, Ph.D. Thesis https://dc.uwm.edu/etd/1218 and Piotrzkowski, B. J. 2022, Ph.D. Thesis https://dc.uwm.edu/etd/3060\n\n",
"published": "2025-03-03T08:08:34.101816Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:34.101834Z",
"modified": "2025-03-03T08:08:34.106668Z",
"targets": []
},
{
"id": 185110,
"topic": "gcn.circulars",
"uuid": "0b97e3dd-7134-4611-af81-e2b429700c2c",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: AstroSat CZTI non-detection and upper limits",
"submitter": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39466"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39466....1W",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: AstroSat CZTI non-detection and upper limits",
"createdOn": 1740459113640,
"submitter": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"circularId": 39466,
"submittedHow": "web"
},
"message_text": "G. Waratkar (IITB), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (TIFR), S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nWe have carried a search [1] for X-ray candidates in Astrosat CZTI data in a 100 sec window around the trigger time of the event S250223dk (UTC 2025-02-23 12:01:15). We use the combined-ext.multiorder.fits map (https://gracedb.ligo.org/api/superevents/S250223dk/files/combined-ext.multiorder.fits,3) for our analysis. CZTI is a coded aperture mask instrument that has considerable effective area for about 29% of the entire sky, but is also sensitive to brighter transients from the entire sky. At the time of the merger, Astrosat's nominal pointing is RA,DEC = 15:49:17.1, 70:18:47.9 (237.32, 70.31), which is ~153 deg away from the maximum probability location. At the time of the merger event, the Earth-satellite-transient angle corresponding to the BAT location is ~126 deg and hence is not occulted by Earth in satellite's frame. In a time interval of 100 sec around the event, the region of the localisation map which is not occulted by Earth in the satellite's frame has a total probability of 1.0 (100%).\n\nCZTI data were de-trended to remove orbit-wise background variation. We then searched data from the four independent, identical quadrants to look for coincident spikes in the count rates. Searches were undertaken by binning the data in 0.1s, 1s, and 10s respectively. Statistical fluctuations in background count rates were estimated by using data from 5 preceding orbits. We selected confidence levels such that the probability of a false trigger in a 100 sec window is 10^-4. We do not find any evidence for any hard X-ray transient in this window, in the CZTI energy range of 20-200 keV.\n\nWe use a detailed mass model of the satellite to calculate the direction-dependent instrument response for points in the visible sky. We then assume the source is modelled as a power law with photon index alpha = -1, and convert our count rate upper limits to direction-dependent flux limits. We obtain the following upper limits for source flux in the 20-200 keV band by taking a probability weighted mean over the visible sky:\n\n| Bin (s) | Flux Limit (ergs/cm^2/s) | Fluence Limit (ergs/cm^2) |\n| ------------ | ------------ | ------------ |\n| 0.1 | 7.01e-06 | 7.01e-07 |\n| 1.0 | 1.73e-06 | 1.73e-06 |\n| 10.0 | 3.01e-07 | 3.01e-06 |\n\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI EMGW detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=emgw\n\n[1] Waratkar et al. ApJ 976, 123 (2024) doi:10.3847/1538-4357/ad84e6\n",
"published": "2025-03-03T08:08:34.078194Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:34.078213Z",
"modified": "2025-03-03T08:08:34.082666Z",
"targets": []
},
{
"id": 185099,
"topic": "gcn.circulars",
"uuid": "b5fe4032-0f48-4e10-b5b8-1a4155b66d31",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Upper limits from Fermi-GBM Observations",
"submitter": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"authors": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39461"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39461....1S",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Upper limits from Fermi-GBM Observations",
"createdOn": 1740426319570,
"submitter": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"circularId": 39461,
"submittedHow": "web"
},
"message_text": "L. Scotton (UAH) reports on behalf of the Fermi-GBM Team:\n\nFor S250223dk and the Swift/BAT-GUANO ID 762004910 (The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration along with the Swift/BAT-GUANO team, GCN 39443) and using the combined skymap combined-ext.multiorder.fits,3, Fermi-GBM was observing 100% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo/KAGRA (LVK) detection of GW trigger S250223dk, neither for the Swift/BAT-GUANO trigger ID 762004910. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates.\n\nPart of the joint localization region is behind the Earth for Fermi, located at RA=267.1, Dec=-5.5 with a radius of 68.0 degrees. We therefore set upper limits on impulsive gamma-ray emission for the joint localization region visible to Fermi at merger time. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV, weighted by the joint LVK-Swift/BAT localization probability (in units of 10^-7 erg/s/cm^2):\n\nTimescale Soft Normal Hard \n------------------------------------\n0.128 s: 2.00 2.90 6.40\n1.024 s: 0.69 0.95 1.90\n8.192 s: 0.23 0.32 0.63\n\nAssuming the median luminosity distance of 6033 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^50 erg/s):\n\nTimescale Soft Normal Hard \n------------------------------------\n0.128s: 14.15 16.94 64.06 \n1.024s: 4.88 5.55 19.02\n8.192s: 1.63 1.87 6.31",
"published": "2025-03-03T08:08:33.885595Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:33.885613Z",
"modified": "2025-03-03T08:08:33.890833Z",
"targets": []
},
{
"id": 185081,
"topic": "gcn.circulars",
"uuid": "9d0959fb-1e10-437d-895d-4a025d7cb66f",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Magellan upper limits.",
"submitter": "Harsh Kumar at Center for Astrophysics | Harvard & Smithsonian <harshkosli13@gmail.com>",
"authors": "Harsh Kumar at Center for Astrophysics | Harvard & Smithsonian <harshkosli13@gmail.com>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39465"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39465....1K",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Magellan upper limits.",
"createdOn": 1740451495939,
"submitter": "Harsh Kumar at Center for Astrophysics | Harvard & Smithsonian <harshkosli13@gmail.com>",
"circularId": 39465,
"submittedHow": "web"
},
"message_text": "H. Kumar, E. Berger, A. Villar, D. Hiramatsu, P. K. Blanchard, K. D. Soto, S. K. Yadavalli, A. Gagliano, C. Ransome, Anya Nugent, Y. Dong (Harvard) report:\n\nWe obtained imaging with the IMACS imager on the 6.5m Magellan Baade telescope to search for an optical counterpart following the announcement of Swift/BAT-GUANO 762004910 (GCN #39443) event, coincident with gravitational wave event S250223dk. We obtained 4 x 120-second images in each of g- and r-band, starting about 16.6 hours after the GW trigger, targeting the Swift/BAT-GUANO localization of 5 arcmin around RA(J2000)= 85.341 deg, Dec(J2000)= -47.554, covering ~95% of the joint LVK-Swift/BAT localization 50% credible region.\n\nWe do not detect new transients above 5-sigma level up to ~23.7 mag in the g-band and ~23.5 mag in the r-band after performing image subtraction with Legacy Survey-DECam images as a reference. \n\n\nWe checked for the DECam DESGW candidates (GCN #39462) in our images. One source (AT2025cpq) falls in the area covered by Magellan. The source is marginally detected at <3 Sigma. We performed forced photometry and obtained the following magnitudes:\n\n—------------------------------------------\nName | Filter | Magnitude +/- e_magnitude\n—------------------------------------------\nAT2025cpq | g | 24.04 +/- 0.48\nAT2025cpq | r | 23.78 +/- 0.28\n—-------------------------------------------\n\n\n\nWe thank Yuri Beletsky for the rapid execution of these observations.\n",
"published": "2025-03-03T08:08:32.667102Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:32.667135Z",
"modified": "2025-03-03T08:08:32.671776Z",
"targets": []
},
{
"id": 185075,
"topic": "gcn.circulars",
"uuid": "bf564b87-973f-4238-ad82-8cca529527be",
"title": "LIGO/Virgo/KAGRA S250223dk: DECam optical detections of Swift X-ray sources",
"submitter": "Antonella Palmese at Carnegie Mellon University <apalmese@andrew.cmu.edu>",
"authors": "Antonella Palmese at Carnegie Mellon University <apalmese@andrew.cmu.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39497"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39497....1P",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk: DECam optical detections of Swift X-ray sources",
"createdOn": 1740592198393,
"submitter": "Antonella Palmese at Carnegie Mellon University <apalmese@andrew.cmu.edu>",
"circularId": 39497,
"submittedHow": "web"
},
"message_text": "Antonella Palmese (CMU), Lei Hu (CMU), Xander J. Hall (CMU), Tomás Cabrera (CMU), Igor Andreoni (UNC), Brendan O’Connor (CMU), Keerthi Kunnumkai (CMU), report on behalf of the GW-MMADS team:\n\nThe high probability area of the joint LVK/Swift-GUANO alert for the gravitational wave candidate S250223dk (GCN 39443) was observed using the wide-field Dark Energy Camera (DECam) on the 4m Blanco telescope (GCN 39462), and we analyzed the data from observations starting 2025-02-24T03:45:38 and 2025-02-25T00:50:13 (GCN 39468).\n\nWe detect a variable source consistent with the location of the Swift XRT source S250223dk_X1 (GCN 39485) at the position of a Quaia (Storey-Fisher et al. 2024) likely quasar source (unWISE source id 0850m470o0042962, RA, dec=85.499,-47.358 [J2000]) with a photometric redshift of 1.4+-0.2, consistent with the distance of the GW alert. Stacked difference imaging with respect to templates from the Dark Energy Survey data reveals a clear source (AT 2025csi) in the griz bands. Our preliminary photometry on the difference imaging results in the following magnitudes: \n\n| MJD | Band | mag | \n| ---------- | ---- | -------------- | \n| 60730.1567 | g | 20.90 +- 0.01 | \n| 60730.1748 | i | 20.38 +- 0.01 |\n| 60731.0349 | g | 20.82 +- 0.007 | \n| 60731.0530 | i | 20.41 +- 0.009 |\n\nWe also inspected archival DECam data at this location and note that this possible quasar showed a steady ~1 mag increase in brightness in all bands between 2013 and 2018. Some archival detections are also present from ATLAS forced photometry over the past two years. The archival detections suggest that the source variability may be unrelated to the GW alert, although we encourage follow-up observations to establish the nature of this object and whether it is currently experiencing flaring activity.\n\nWe also detect a transient (AT 2025cpu) in the griz bands consistent with the location of S250223dk_X5 at position RA, dec= 85.51643, -47.70934 [J2000], with the following magnitudes:\n\n| MJD | Band | mag | \n| ---------- | ---- | ------------- | \n| 60730.1569 | g | 22.71 +- 0.03 | \n| 60730.1748 | i | 22.63 +- 0.07 |\n| 60731.0349 | g | 22.55 +- 0.03 | \n| 60731.0530 | i | 22.74 +- 0.05 |\n\nWe note that this source appears as a nuclear transient in a possible galaxy with photometric redshift of 0.797+-0.088 (from the DESI Legacy Survey photometric redshift catalog). The archival DECam observations for this source show variability of up to a magnitude, thus we cannot exclude that these detections are due to AGN variability.\n\nFurther analysis of these sources is planned and follow-up observations are encouraged. \n\nWe thank the CTIO and NOIRLab staff for supporting observations and data calibration.\n",
"published": "2025-03-03T08:08:32.569067Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:32.569085Z",
"modified": "2025-03-03T08:08:32.573488Z",
"targets": []
},
{
"id": 185060,
"topic": "gcn.circulars",
"uuid": "045d4b52-e50d-4680-9f11-7fbf8a337fe3",
"title": "LIGO/Virgo/KAGRA S250223dk: DDOTI Upper Limits on the Optical Counterpart",
"submitter": "Alan Watson at UNAM <alan@astro.unam.mx>",
"authors": "Alan Watson at UNAM <alan@astro.unam.mx>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39444"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39444....1W",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk: DDOTI Upper Limits on the Optical Counterpart",
"createdOn": 1740372801303,
"submitter": "Alan Watson at UNAM <alan@astro.unam.mx>",
"circularId": 39444,
"submittedHow": "web"
},
"message_text": "Alan M. Watson (UNAM), William H. Lee (UNAM), Océlotl López (UNAM), Camila Angulo Valdez (UNAM), Rosa L. Becerra (U Roma), Nat Butler (ASU), Simone Dichiara (Penn State University), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), and Margarita Pereyra (UNAM), and Eleonora Troja (U Roma) report:\n\nWe imaged the field of the Swift/BAT-GUANO trigger possibly associated with LIGO/Virgo/KAGRA S250223dk (GCN Circ. 39443) with the DDOTI wide-field imager at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir in Mexico (http://ddoti.astroscu.unam.mx).\n\nWe observed the whole BAT error region from 2025-02-24 03:56 UTC to 04:24 UTC (15.9 to 16.4 hours after the GW event) at extremely high airmass. We obtained a total exposure of 24 minutes.\n\nComparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogues, we detect no uncatalogued sources within the observed BAT error region to a 5-sigma AB limiting magnitude of \n\nw > 20.0.\n\nOur photometry is in the AB system and is not corrected for Galactic extinction.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.\n\n",
"published": "2025-03-03T08:08:32.396412Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-03T08:08:32.396435Z",
"modified": "2025-03-03T08:08:32.400559Z",
"targets": []
},
{
"id": 183710,
"topic": "gcn.circulars",
"uuid": "abc4fa9b-ecc5-41fb-b27a-9ca8a9ebd64d",
"title": "LIGO/Virgo/KAGRA S250223dk: Insight-HXMT/HE sub-threshold detection of a burst (HEB 250223501)",
"submitter": "yqzhang_cl@163.com",
"authors": "yqzhang_cl@163.com",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39508"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk: Insight-HXMT/HE sub-threshold detection of a burst (HEB 250223501)",
"createdOn": 1740625618610,
"submitter": "yqzhang_cl@163.com",
"circularId": 39508,
"submittedHow": "web"
},
"message_text": "Ce Cai (HEBNU), Shao-Lin Xiong, Xiao-Bo Li, Shu-Xu Yi, Shuang-Nan Zhang (IHEP) report on behalf of the Insight-HXMT team:\n\nAt the event time (T0 = 2025-02-23T12:01:15.360 UTC) of the LIGO/Virgo/KAGRA S250223dk event, which was reported to be possibly associated with a sub-threshold burst candidate by Swift/BAT (GCN 39443, 39499), Insight-HXMT was observing 99.97% of the localization probability region based on the combined skymap and there is no Insight-HXMT/HE triggers from the on-ground automated blind search around this event. \n\nThus, we implemented a targeted search [1] for sub-threshold burst signals within the window of T0+/-30 s using the central region of the joint LVK-Swift/BAT localization probability map (i.e. RA = 85.341 deg, Dec = -47.554 deg) and three types of GRB spectra. Our targeted search detected a burst candidate (named as HEB 250223501) with about 4 sigma on the 1-second timescale, starting at T0 - 9.50 s. We note that the time of this Insight-HXMT/HE burst candidate is well consistent with the start time of the Swift/BAT candidate (T0 - 10.240 s, GCN 39443), but the duration is much shorter, which could be explained as the detection energy band of Insight-HXMT/HE is higher than that of Swift/BAT in terms of GRB observation.\n\nWe note that these results are very preliminary. Refined analysis will be reported later.\n\nInsight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://hxmten.ihep.ac.cn/.\n\n[1] Cai, C., Xiong, S. L., Li, C. K., et al. 2021, MNRAS, 508, 3910S\n",
"published": "2025-02-27T03:07:23.323844Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-27T03:07:23.323874Z",
"modified": "2025-02-27T03:07:23.338196Z",
"targets": []
},
{
"id": 183580,
"topic": "gcn.circulars",
"uuid": "e7c70584-015a-4398-a79b-54334c99e772",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Updated Sky localization and Coincidence with External Event",
"submitter": "ethan.payne@ligo.org",
"authors": "ethan.payne@ligo.org",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39499"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Updated Sky localization and Coincidence with External Event",
"createdOn": 1740594413278,
"submitter": "ethan.payne@ligo.org",
"circularId": 39499,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration along with the Swift/BAT-GUANO team report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250223dk (GCN Circular 39443). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S250223dk\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 18323 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 9589 +/- 6347 Mpc (a posteriori mean +/- standard deviation).\n\nA search performed by the RAVEN pipeline [2] found a temporal coincidence between S250223dk and a sub-threshold Swift/BAT trigger with ID 762004910 (GCN circular 39443). The GRB trigger time is 10.24 seconds before the GW candidate event. The estimated joint false alarm rate for the coincidence using just timing info is 1.9e-07 Hz, or about one in a month. The GRB candidate was found during a joint targeted search between the LIGO/Virgo/KAGRA collaboration and Swift/BAT-GUANO, and has a false alarm rate of 7.4e-05 Hz, or about one in 3 hours. RAVEN has also identified an additional detection from Fermi GBM.\n\nCombined sky maps are also available:\n * combined-ext.multiorder.fits,0, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,1, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,2, an initial localization, distributed via GCN notice about 13 hours after the candidate event time.\n * combined-ext.multiorder.fits,3, an initial localization, distributed via GCN notice about 15 hours after the candidate event time.\n * combined-ext.multiorder.fits,5, an updated localization, distributed via GCN notice about 3 days after the candidate event time.\n\nThe joint LVK-Swift/BAT localization probability map peaks at\nRA = 85.341 deg, \nDec = -47.554 deg. \nA circle with a radius of 10 arcmin around this position contains 52% of the integrated joint probability.\n\nFor the combined-ext.multiorder.fits,5 sky map, the 90% credible region is 1 deg2. Considering the overlap of the individual sky maps, the estimated joint false alarm rate for the spatial and temporal coincidence is 1.7e-08 Hz, or about one in 2 years. After considering trials factors, this means the joint FAR is larger than the ‘'high significance’' alert threshold and this joint event is no longer considered significant.\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. (2023) arXiv:2307.13380\n [2] Urban, A. L. 2016, Ph.D. Thesis https://dc.uwm.edu/etd/1218 and Piotrzkowski, B. J. 2022, Ph.D. Thesis https://dc.uwm.edu/etd/3060\n",
"published": "2025-02-26T18:27:16.375082Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-26T18:27:16.375132Z",
"modified": "2025-02-26T18:27:16.386043Z",
"targets": []
},
{
"id": 183569,
"topic": "gcn.circulars",
"uuid": "fc8a5810-e392-477c-95bb-9b3a422077bb",
"title": "LIGO/Virgo/KAGRA S250223dk: DECam optical detections of Swift X-ray sources",
"submitter": "Antonella Palmese at Carnegie Mellon University <apalmese@andrew.cmu.edu>",
"authors": "Antonella Palmese at Carnegie Mellon University <apalmese@andrew.cmu.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39497"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk: DECam optical detections of Swift X-ray sources",
"createdOn": 1740592198393,
"submitter": "Antonella Palmese at Carnegie Mellon University <apalmese@andrew.cmu.edu>",
"circularId": 39497,
"submittedHow": "web"
},
"message_text": "Antonella Palmese (CMU), Lei Hu (CMU), Xander J. Hall (CMU), Tomás Cabrera (CMU), Igor Andreoni (UNC), Brendan O’Connor (CMU), Keerthi Kunnumkai (CMU), report on behalf of the GW-MMADS team:\n\nThe high probability area of the joint LVK/Swift-GUANO alert for the gravitational wave candidate S250223dk (GCN 39443) was observed using the wide-field Dark Energy Camera (DECam) on the 4m Blanco telescope (GCN 39462), and we analyzed the data from observations starting 2025-02-24T03:45:38 and 2025-02-25T00:50:13 (GCN 39468).\n\nWe detect a variable source consistent with the location of the Swift XRT source S250223dk_X1 (GCN 39485) at the position of a Quaia (Storey-Fisher et al. 2024) likely quasar source (unWISE source id 0850m470o0042962, RA, dec=85.499,-47.358 [J2000]) with a photometric redshift of 1.4+-0.2, consistent with the distance of the GW alert. Stacked difference imaging with respect to templates from the Dark Energy Survey data reveals a clear source (AT 2025csi) in the griz bands. Our preliminary photometry on the difference imaging results in the following magnitudes: \n\n| MJD | Band | mag | \n| ---------- | ---- | -------------- | \n| 60730.1567 | g | 20.90 +- 0.01 | \n| 60730.1748 | i | 20.38 +- 0.01 |\n| 60731.0349 | g | 20.82 +- 0.007 | \n| 60731.0530 | i | 20.41 +- 0.009 |\n\nWe also inspected archival DECam data at this location and note that this possible quasar showed a steady ~1 mag increase in brightness in all bands between 2013 and 2018. Some archival detections are also present from ATLAS forced photometry over the past two years. The archival detections suggest that the source variability may be unrelated to the GW alert, although we encourage follow-up observations to establish the nature of this object and whether it is currently experiencing flaring activity.\n\nWe also detect a transient (AT 2025cpu) in the griz bands consistent with the location of S250223dk_X5 at position RA, dec= 85.51643, -47.70934 [J2000], with the following magnitudes:\n\n| MJD | Band | mag | \n| ---------- | ---- | ------------- | \n| 60730.1569 | g | 22.71 +- 0.03 | \n| 60730.1748 | i | 22.63 +- 0.07 |\n| 60731.0349 | g | 22.55 +- 0.03 | \n| 60731.0530 | i | 22.74 +- 0.05 |\n\nWe note that this source appears as a nuclear transient in a possible galaxy with photometric redshift of 0.797+-0.088 (from the DESI Legacy Survey photometric redshift catalog). The archival DECam observations for this source show variability of up to a magnitude, thus we cannot exclude that these detections are due to AGN variability.\n\nFurther analysis of these sources is planned and follow-up observations are encouraged. \n\nWe thank the CTIO and NOIRLab staff for supporting observations and data calibration.\n",
"published": "2025-02-26T17:57:13.724408Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-26T17:57:13.724438Z",
"modified": "2025-02-26T17:57:13.732740Z",
"targets": []
},
{
"id": 183444,
"topic": "gcn.circulars",
"uuid": "2f920185-d02b-41ea-8d54-4aa39642cd47",
"title": "LIGO/Virgo S250223dk: Swift XRT observations, 7 X-ray sources",
"submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39485"
},
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo S250223dk",
"subject": "LIGO/Virgo S250223dk: Swift XRT observations, 7 X-ray sources",
"createdOn": 1740558785504,
"submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"circularId": 39485,
"submittedHow": "email"
},
"message_text": "P.A. Evans (U. Leicester), J.J. Delaunay (PSU), K.L. Page (U.\nLeicester), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), S.B. Cenko\n(NASA/GSFC), R.A.J. Eyles-Ferris (U. Leicester), A.P. Beardmore (U.\nLeicester), M.G. Bernardini (INAF-OAB), A.A. Breeveld (UCL-MSSL), S.\nCampana (INAF-OAB), M. De Pasquale (University of Messina), S. Dichiara\n(PSU), P. D’Avanzo (INAF-OAB), A. D’Aì (INAF-IASFPA) , V. D’Elia\n(ASI-SSDC & INAF-OAR), C. Gronwall (PSU), D. Hartmann (Clemson\nUniversity), N. Klingler (NASA-GSFC / UMBC / CRESST II), N.P.M. Kuin\n(UCL-MSSL), S. Laha (NASA/GSFC), S.R. Oates (U. Birmingham), J.P.\nOsborne (U. Leicester), P. O’Brien (U. Leicester), M.J. Page\n(UCL-MSSL), G. Raman (PSU) S. Ronchini (PSU), T. Sbarrato (INAF-OAB),\nB. Sbarufatti (INAF-OAB), M.H. Siegel (PSU), G. Tagliaferri (INAF-OAB),\nE. Troja (U Tor Vergata, INAF) report on behalf of the Swift team:\n\nSwift has carried out 1 observation of the combined LVK/Swift-BAT-GUANO\nerror region for the GW trigger S250223dk, centred on the most-probable\nlocation (RA,Dec = 85.4260, -47.5420 [J2000]). We gathered 5.5 ks of\ndata from 106 ks to 140 ks after the LVK trigger. This observations\ncovers 73% of the probability in the combined skymap.\n\nWe have detected 7 X-ray sources. Each source is assigned a rank of 1-4\nwhich describes how likely it is to be related to the GW trigger, with\n1 being the most likely and 4 being the least likely. The ranks are\ndescribed at https://www.swift.ac.uk/ranks.php.\n\nWe have found:\n\n * 0 sources of rank 1\n * 0 sources of rank 2\n * 7 sources of rank 3\n * 0 sources of rank 4\n\n\nRANK 3 sources\n==============\n\nThese are uncatalogued X-ray sources, however they are not brighter\nthan previous upper limits, so do not stand out as likely counterparts\nto the GW trigger.\n\n| Source ID\t | RA\t\t | Dec \t | Err90 |\n| S250223dk_X1 | 05h 41m 59.75s | -47d 21' 33.8\" |\t6.8\" |\n| S250223dk_X2 | 05h 42m 11.19s | -47d 23' 57.3\" |\t6.4\" |\n| S250223dk_X3 | 05h 41m 58.45s | -47d 33' 26.5\" |\t6.5\" |\n| S250223dk_X4 | 05h 42m 19.59s | -47d 34' 02.3\" |\t6.9\" |\n| S250223dk_X5 | 05h 42m 03.87s | -47d 42' 35.1\" |\t6.4\" |\n| S250223dk_X6 | 05h 42m 01.25s | -47d 43' 06.8\" |\t6.3\" |\n| S250223dk_X7 | 05h 41m 25.44s | -47d 26' 58.1\" |\t6.4\" |\n\nFor all flux conversions and comparisons with catalogues and upper\nlimits from other missions, we assumed a power-law spectrum with\nNH=3x10^20 cm^-2, and photon index (Gamma)=1.7, unless otherwise\nstated.\n\nThe results of the XRT automated analysis, including details of the\nsources listed above, are online at\nhttps://www.swift.ac.uk/LVC/S250223dk\n\nThis circular is an official product of the Swift XRT team.\n\n\n",
"published": "2025-02-26T08:33:17.597439Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-26T08:33:17.597471Z",
"modified": "2025-02-26T08:33:17.604120Z",
"targets": []
},
{
"id": 182904,
"topic": "gcn.circulars",
"uuid": "2054aba5-35a5-47ba-b28a-94f0c4577427",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: DECam GW-MMADS candidates",
"submitter": "xjh@andrew.cmu.edu",
"authors": "xjh@andrew.cmu.edu",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39468"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: DECam GW-MMADS candidates",
"createdOn": 1740466010500,
"submitter": "xjh@andrew.cmu.edu",
"circularId": 39468,
"submittedHow": "web"
},
"message_text": "Lei Hu (CMU), Xander J. Hall (CMU), Tomás Cabrera (CMU), Antonella Palmese (CMU), Igor Andreoni (UNC), Brendan O’Connor (CMU), Keerthi Kunnumkai (CMU), on behalf of the GW-MMADS team\n\nThe high probability area of the joint LVK/Swift-GUANO alert for the gravitational wave candidate S250223dk (GCN 39443) was observed using the wide-field Dark Energy Camera (DECam) on the 4m Blanco telescope by the Dark Energy Survey Gravitational Wave (DESGW) program (PI: Soares-Santos; GCN 39462). Observations started at 2025-02-24T03:45:38 on the night of the alert, and at 2025-02-25T00:50:13 on the following night. We find that the median 5sigma depths of the exposures are r\\~24.7 mag on the first night and r\\~24.9 mag on the second night. \n\nAs part of the Gravitational Wave Multi-Messenger Astronomy DECam Survey (GW-MMADS), we run the SFFT difference imaging (Hu et al. 2022) on the available images using templates from DES, filter out likely stars and moving objects, visually inspect the remaining transients. We posted on TNS new transients from this analysis and report here the most likely extragalactic transients we find within the joint LVK-GUANO skymap 95% credible interval area:\n\n| id | AT name | ra | dec | discovery_date (UT) | mag_r | mag_r_err | mag_r-mag_i |\n\n| ------------------------ | ---------- | ---------- | ---------- | ----------------------- | ------ | ----- | ----- |\n| C202502240542297m473928 | AT 2025cqb | 85.623700 | -47.657680 | 2025-02-24T03:58:42 | 23.04 | 0.05 | 0.20\n| C202502240549253m474247 | AT 2025cqf | 87.355530 | -47.713117 | 2025-02-24T03:58:42 | 24.44 | 0.20 | N/A\n| A202502240541155m473906* | AT 2025cpv | 85.314435 | -47.651722 | 2025-02-24T03:45:38 | 23.55 | 0.08 | 0.21\n| C202502240541459m473517 | AT 2025cql | 85.441205 | -47.588088 | 2025-02-24T04:24:50 | 24.77 | 0.25 | N/A\n| C202502240545203m483410 | AT 2025cqm | 86.334777 | -48.569306 | 2025-02-24T03:58:42 | 24.00 | 0.13 | N/A\n| T202502240543468m475332 | AT 2025cqc | 85.944938 | -47.892308 | 2025-02-24T03:45:38 | 23.00 | 0.05 | 0.21\n| C202502240544410m483014 | AT 2025cqe | 86.170896 | -48.503829 | 2025-02-24T03:58:42 | 23.75 | 0.10 | 0.49\n| A202502240546005m475901* | AT 2025cqd | 86.502090 | -47.983653 | 2025-02-24T03:45:38 | 22.48 | 0.03 | 0.23\n\n* Possible stellar origin\n\nMagnitudes reported are from the discovery date and not corrected from Milky Way extinction.\n\nFurther analysis is underway.\n\nWe thank the CTIO and NOIRLab staff for supporting observations and data calibration.\n\n\n",
"published": "2025-02-25T06:49:53.336343Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-25T06:49:53.336407Z",
"modified": "2025-02-25T06:49:53.346464Z",
"targets": []
},
{
"id": 182902,
"topic": "gcn.circulars",
"uuid": "648272d3-5325-4182-aa45-8ed0985f1245",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: AstroSat CZTI non-detection and upper limits",
"submitter": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39466"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: AstroSat CZTI non-detection and upper limits",
"createdOn": 1740459113640,
"submitter": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"circularId": 39466,
"submittedHow": "web"
},
"message_text": "G. Waratkar (IITB), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (TIFR), S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nWe have carried a search [1] for X-ray candidates in Astrosat CZTI data in a 100 sec window around the trigger time of the event S250223dk (UTC 2025-02-23 12:01:15). We use the combined-ext.multiorder.fits map (https://gracedb.ligo.org/api/superevents/S250223dk/files/combined-ext.multiorder.fits,3) for our analysis. CZTI is a coded aperture mask instrument that has considerable effective area for about 29% of the entire sky, but is also sensitive to brighter transients from the entire sky. At the time of the merger, Astrosat's nominal pointing is RA,DEC = 15:49:17.1, 70:18:47.9 (237.32, 70.31), which is ~153 deg away from the maximum probability location. At the time of the merger event, the Earth-satellite-transient angle corresponding to the BAT location is ~126 deg and hence is not occulted by Earth in satellite's frame. In a time interval of 100 sec around the event, the region of the localisation map which is not occulted by Earth in the satellite's frame has a total probability of 1.0 (100%).\n\nCZTI data were de-trended to remove orbit-wise background variation. We then searched data from the four independent, identical quadrants to look for coincident spikes in the count rates. Searches were undertaken by binning the data in 0.1s, 1s, and 10s respectively. Statistical fluctuations in background count rates were estimated by using data from 5 preceding orbits. We selected confidence levels such that the probability of a false trigger in a 100 sec window is 10^-4. We do not find any evidence for any hard X-ray transient in this window, in the CZTI energy range of 20-200 keV.\n\nWe use a detailed mass model of the satellite to calculate the direction-dependent instrument response for points in the visible sky. We then assume the source is modelled as a power law with photon index alpha = -1, and convert our count rate upper limits to direction-dependent flux limits. We obtain the following upper limits for source flux in the 20-200 keV band by taking a probability weighted mean over the visible sky:\n\n| Bin (s) | Flux Limit (ergs/cm^2/s) | Fluence Limit (ergs/cm^2) |\n| ------------ | ------------ | ------------ |\n| 0.1 | 7.01e-06 | 7.01e-07 |\n| 1.0 | 1.73e-06 | 1.73e-06 |\n| 10.0 | 3.01e-07 | 3.01e-06 |\n\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI EMGW detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=emgw\n\n[1] Waratkar et al. ApJ 976, 123 (2024) doi:10.3847/1538-4357/ad84e6\n",
"published": "2025-02-25T04:55:05.842102Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-25T04:55:05.842134Z",
"modified": "2025-02-25T04:55:05.853692Z",
"targets": []
},
{
"id": 182846,
"topic": "gcn.circulars",
"uuid": "f9de087e-3b4e-466e-a496-9c278760342e",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Magellan upper limits.",
"submitter": "Harsh Kumar at Center for Astrophysics | Harvard & Smithsonian <harshkosli13@gmail.com>",
"authors": "Harsh Kumar at Center for Astrophysics | Harvard & Smithsonian <harshkosli13@gmail.com>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39465"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Magellan upper limits.",
"createdOn": 1740451495939,
"submitter": "Harsh Kumar at Center for Astrophysics | Harvard & Smithsonian <harshkosli13@gmail.com>",
"circularId": 39465,
"submittedHow": "web"
},
"message_text": "H. Kumar, E. Berger, A. Villar, D. Hiramatsu, P. K. Blanchard, K. D. Soto, S. K. Yadavalli, A. Gagliano, C. Ransome, Anya Nugent, Y. Dong (Harvard) report:\n\nWe obtained imaging with the IMACS imager on the 6.5m Magellan Baade telescope to search for an optical counterpart following the announcement of Swift/BAT-GUANO 762004910 (GCN #39443) event, coincident with gravitational wave event S250223dk. We obtained 4 x 120-second images in each of g- and r-band, starting about 16.6 hours after the GW trigger, targeting the Swift/BAT-GUANO localization of 5 arcmin around RA(J2000)= 85.341 deg, Dec(J2000)= -47.554, covering ~95% of the joint LVK-Swift/BAT localization 50% credible region.\n\nWe do not detect new transients above 5-sigma level up to ~23.7 mag in the g-band and ~23.5 mag in the r-band after performing image subtraction with Legacy Survey-DECam images as a reference. \n\n\nWe checked for the DECam DESGW candidates (GCN #39462) in our images. One source (AT2025cpq) falls in the area covered by Magellan. The source is marginally detected at <3 Sigma. We performed forced photometry and obtained the following magnitudes:\n\n—------------------------------------------\nName | Filter | Magnitude +/- e_magnitude\n—------------------------------------------\nAT2025cpq | g | 24.04 +/- 0.48\nAT2025cpq | r | 23.78 +/- 0.28\n—-------------------------------------------\n\n\n\nWe thank Yuri Beletsky for the rapid execution of these observations.\n",
"published": "2025-02-25T02:46:32.622557Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-25T02:46:32.623206Z",
"modified": "2025-02-25T02:46:32.640252Z",
"targets": []
},
{
"id": 182775,
"topic": "gcn.circulars",
"uuid": "5d05c4fe-ea54-4585-ad37-fd30c1eec39e",
"title": "LIGO/Virgo/KAGRA S250223dk: DECam DESGW Candidates",
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39462"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk: DECam DESGW Candidates",
"createdOn": 1740436576252,
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"circularId": 39462,
"submittedHow": "web"
},
"message_text": "I. McMahon (UZH), S. MacBride (UZH), H. T. Diehl (FNAL), S. Kaur (UZH), L. Joseph (Benedictine U.), N. Sherman (Boston U.), K. Herner (Fermilab), M. Soares-Santos (UZH), reporting on behalf of the Dark Energy Survey Gravitational Wave (DESGW) Team:\n\nAt 03:45:38 UTC, the Dark Energy Camera (DECam) began observing in response to the joint LVK/Swift-BAT RAVEN alert issued for the candidate gravitational-wave event S250223dk (GCN 39443). We observed two fields centered on the following ICRS coordinates\n(85.80,-47.60)\n(85.83,-47.63)\nBoth fields were observed in DECam g, r, i, and z filters with 360 second exposures. The limiting magnitude achieved is 23.36 in r-band. \n\nImages were processed by our difference imaging pipeline (Herner et al. 2020) using DES and public DECam images as templates. We employ the autoscan machine learning code (Goldstein et al. 2015) to reject subtraction artifacts. Candidates were initially selected by requiring at least two high signal to noise detections, which were separated in time in order to reject moving objects. We also require an autoscan score of at least 0.7 on at least one of those detections. \n\nAfter candidate selection, we report five high confidence candidates (listed below). After vetting and identification, four candidates were classified as nuclear candidates (likely AGNs), one candidate (2017239) has been labeled as a possible supernova. All candidates have a host galaxy match within 1 arcsecond. None of the candidate hosts are included in the ALLWISE and MILLIQUAS AGN catalogs (Secrest et. al 2015, Flesch 2023). No other candidates were found in the area. We encourage followup of the five candidates identified herein. \n\n| id | AT name | ra | dec | discovery_date (UT) | mag_g | mag_g_err | mag_r | mag_r_err | mag_i | mag_i_err | mag_z | mag_z_err |\n| --------------- | ---------- | ---------- | ---------- | ----------------------- | ------ | ----- | ------ | ----- | ------ | ----- | ------ | ----- |\n| 2014974 | AT2025cpl | 86.327994 | -47.827215 | 2025-02-24 03:45:38.271 | 22.487 | 0.043 | 22.151 | 0.031 | 21.744 | 0.053 | 21.894 | 0.106 |\n| 2014991 | AT2025cpm | 86.516403 | -47.893872 | 2025-02-24 03:45:38.271 | 23.448 | 0.107 | 22.905 | 0.060 | 22.453 | 0.103 | 22.308 | 0.153 |\n| 2015571 | AT2025cpo | 86.105565 | -47.689987 | 2025-02-24 03:45:38.271 | 22.972 | 0.053 | N/A | N/A | 22.423 | 0.084 | 22.765 | 0.203 |\n| 2015600 | AT2025cpp | 86.176728 | -47.763957 | 2025-02-24 03:52:10.108 | 21.980 | 0.024 | N/A | N/A | 22.097 | 0.061 | 22.312 | 0.132 |\n| 2017239 | AT2025cpq | 85.552523 | -47.577823 | 2025-02-24 03:58:42.138 | 24.503 | 0.268 | 23.980 | 0.161 | 23.972 | 0.320 | 24.265 | 0.851 |\n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations.",
"published": "2025-02-24T22:37:05.378597Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-24T22:37:05.378622Z",
"modified": "2025-02-24T22:37:05.395796Z",
"targets": []
},
{
"id": 182729,
"topic": "gcn.circulars",
"uuid": "a78d7a05-1062-4423-91b6-9828948d4942",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Upper limits from Fermi-GBM Observations",
"submitter": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"authors": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39461"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO ID 762004910: Upper limits from Fermi-GBM Observations",
"createdOn": 1740426319570,
"submitter": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"circularId": 39461,
"submittedHow": "web"
},
"message_text": "L. Scotton (UAH) reports on behalf of the Fermi-GBM Team:\n\nFor S250223dk and the Swift/BAT-GUANO ID 762004910 (The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration along with the Swift/BAT-GUANO team, GCN 39443) and using the combined skymap combined-ext.multiorder.fits,3, Fermi-GBM was observing 100% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo/KAGRA (LVK) detection of GW trigger S250223dk, neither for the Swift/BAT-GUANO trigger ID 762004910. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates.\n\nPart of the joint localization region is behind the Earth for Fermi, located at RA=267.1, Dec=-5.5 with a radius of 68.0 degrees. We therefore set upper limits on impulsive gamma-ray emission for the joint localization region visible to Fermi at merger time. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV, weighted by the joint LVK-Swift/BAT localization probability (in units of 10^-7 erg/s/cm^2):\n\nTimescale Soft Normal Hard \n------------------------------------\n0.128 s: 2.00 2.90 6.40\n1.024 s: 0.69 0.95 1.90\n8.192 s: 0.23 0.32 0.63\n\nAssuming the median luminosity distance of 6033 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^50 erg/s):\n\nTimescale Soft Normal Hard \n------------------------------------\n0.128s: 14.15 16.94 64.06 \n1.024s: 4.88 5.55 19.02\n8.192s: 1.63 1.87 6.31",
"published": "2025-02-24T19:45:37.843858Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-24T19:45:37.843903Z",
"modified": "2025-02-24T19:45:37.863495Z",
"targets": []
},
{
"id": 182710,
"topic": "gcn.circulars",
"uuid": "63db6a19-acf4-4d5d-87b4-bb2cf16f3810",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO trigger with ID 762004910: Identification of a GW compact binary merger candidate possibly associated with a sub-threshold Swift/BAT-GUANO trigger",
"submitter": "minghuidu1993@gmail.com",
"authors": "minghuidu1993@gmail.com",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39443"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO trigger with ID 762004910: Identification of a GW compact binary merger candidate possibly associated with a sub-threshold Swift/BAT-GUANO trigger",
"version": 3,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Samuele Ronchini at PSU <sjs8171@psu.edu>",
"editedOn": 1740423239074,
"createdOn": 1740366735127,
"submitter": "minghuidu1993@gmail.com",
"circularId": 39443,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration along with the Swift/BAT-GUANO team report:\n\nWe identified the compact binary merger candidate S250223dk during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at T0 = 2025-02-23 12:01:15.360 UTC (GPS time: 1424347293.360). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS250223dk is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.4e-05 Hz, or about one in 19 hours. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250223dk\n\nThe classification of the GW signal, in order of descending probability, is Terrestrial (92%), BBH (8%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nFive GW-only sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN notice about a minute after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 5 minutes after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 12 hours after the candidate event time.\n * bayestar.multiorder.fits,3, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 12 hours after the candidate event time.\n * bayestar.multiorder.fits,4, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 13 hours after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,4. For the bayestar.multiorder.fits,4 sky map, the 90% credible region is 3203 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 6033 +/- 1778 Mpc (a posteriori mean +/- standard deviation).\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; [4]). \n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-45,+45] seconds around the time of the GW alert. All the requested event mode data was delivered to the ground. \n\nThe BAT likelihood search, NITRATES [5], performed on the temporal window [T0-20 s, T0+20 s], detects a burst candidate with a sqrt(TS) of 8.0 in a 8.192 s analysis time bin, starting at T0 - 10.240 s \n\nThe 90% credible area is 2666 deg2 and the 50% credible area is <1 deg2.\nThe integrated probability inside the coded field of view is 83%. \n\nThe joint LVK-Swift/BAT localization probability map peaks at \nRA = 85.341 deg,\nDec = -47.554 deg.\nA circle with a radius of 10 arcmin around this position contains 74% of the integrated joint probability.\n\nSwift has already initiated TOO followup of this position with XRT and UVOT. Results will be reported in future circulars. We encourage followup by other, more sensitive, facilities.\n\nA plot of the Swift/BAT probability skymap can be viewed here:\n\n[https://guano.swift.psu.edu/trigger_report?id=762004910/#:~:text=Probability%20Skymap](https://guano.swift.psu.edu/trigger_report?id=762004910/#:~:text=Probability%20Skymap)\n\nThe Swift/BAT probability skymap file can be downloaded from the link here:\n\n[https://guano.swift.psu.edu/files/762004910/0_n_PROBMAP](https://guano.swift.psu.edu/files/762004910/0_n_PROBMAP)\n\nInstructions on how to read and manipulate this map can be found here:\n\n[https://guano.swift.psu.edu/documentation](https://guano.swift.psu.edu/documentation)\n\nMore details about this burst can be found on the trigger report page here:\n\n[https://guano.swift.psu.edu/trigger_report?id=762004910](https://guano.swift.psu.edu/trigger_report?id=762004910)\n\n\nA search performed by the RAVEN pipeline [6] found a temporal coincidence between S250223dk and a sub-threshold Swift/BAT trigger with ID 762004910. The GRB trigger time is 10.24 seconds before the GW candidate event. The estimated joint false alarm rate for the coincidence using just timing info is 1.9e-07 Hz, or about one in a month. The GRB candidate was found during a joint targeted search between the LIGO/Virgo/KAGRA collaboration and Swift/BAT-GUANO, and has a false alarm rate of 7.4e-05 Hz, or about one in 3 hours.Combined sky maps are also available:\n * combined-ext.multiorder.fits,0, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,1, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,2, an initial localization, distributed via GCN notice about 13 hours after the candidate event time.\n\nFor the combined-ext.multiorder.fits,2 sky map, the 90% credible region is <1 deg2. The joint localization is dominated by the Swift/BAT-GUANO candidate. Considering the overlap of the individual sky maps, the estimated joint false alarm rate for the spatial and temporal coincidence is 5.1e-09 Hz, or about one in 6 years.\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625\n \n [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n \n [3] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n \n [4] Tohuvavohu et al. ApJ, 900, 1 (2020)\n \n [5] DeLaunay & Tohuvavohu, ApJ, 941, 169 (2022)\n \n [6] Urban, A. L. 2016, Ph.D. Thesis https://dc.uwm.edu/etd/1218 and Piotrzkowski, B. J. 2022, Ph.D. Thesis https://dc.uwm.edu/etd/3060\n\n",
"published": "2025-02-24T18:55:32.048047Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-24T18:55:32.048093Z",
"modified": "2025-02-24T18:55:32.062117Z",
"targets": []
},
{
"id": 182671,
"topic": "gcn.circulars",
"uuid": "f0b0c354-c638-42a2-b7be-1f766178c8fe",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO trigger with ID 762004910: Identification of a GW compact binary merger candidate possibly associated with a sub-threshold Swift/BAT-GUANO trigger",
"submitter": "minghuidu1993@gmail.com",
"authors": "minghuidu1993@gmail.com",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39443"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO trigger with ID 762004910: Identification of a GW compact binary merger candidate possibly associated with a sub-threshold Swift/BAT-GUANO trigger",
"version": 2,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Samuele Ronchini at PSU <sjs8171@psu.edu>",
"editedOn": 1740409005339,
"createdOn": 1740366735127,
"submitter": "minghuidu1993@gmail.com",
"circularId": 39443,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration along with the Swift/BAT-GUANO team report:\n\nWe identified the compact binary merger candidate S250223dk during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at T0 = 2025-02-23 12:01:15.360 UTC (GPS time: 1424347293.360). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS250223dk is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.4e-05 Hz, or about one in 19 hours. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250223dk\n\nThe classification of the GW signal, in order of descending probability, is Terrestrial (92%), BBH (8%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nFive GW-only sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN notice about a minute after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 5 minutes after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 12 hours after the candidate event time.\n * bayestar.multiorder.fits,3, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 12 hours after the candidate event time.\n * bayestar.multiorder.fits,4, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 13 hours after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,4. For the bayestar.multiorder.fits,4 sky map, the 90% credible region is 3203 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 6033 +/- 1778 Mpc (a posteriori mean +/- standard deviation).\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; [4]). \n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-45,+45] seconds around the time of the GW alert. All the requested event mode data was delivered to the ground. \n\nThe BAT likelihood search, NITRATES [5], performed on the temporal window [T0-20 s, T0+20 s], detects a burst candidate with a sqrt(TS) of 8.0 in a 8.192 s analysis time bin, starting at T0 - 10.240 s \n\nThe 90% credible area is 2666 deg2 and the 50% credible area is <1 deg2.\nThe integrated probability inside the coded field of view is 83%. \n\nThe joint LVK-Swift/BAT localization probability map peaks at \nRA = 85.341 deg,\nDec = -47.554 deg.\nA circle with a radius of 5 arcmin around this position contains 52% of the integrated joint probability.\n\nSwift has already initiated TOO followup of this position with XRT and UVOT. Results will be reported in future circulars. We encourage followup by other, more sensitive, facilities.\n\nA plot of the Swift/BAT probability skymap can be viewed here:\n\n[https://guano.swift.psu.edu/trigger_report?id=762004910/#:~:text=Probability%20Skymap](https://guano.swift.psu.edu/trigger_report?id=762004910/#:~:text=Probability%20Skymap)\n\nThe Swift/BAT probability skymap file can be downloaded from the link here:\n\n[https://guano.swift.psu.edu/files/762004910/0_n_PROBMAP](https://guano.swift.psu.edu/files/762004910/0_n_PROBMAP)\n\nInstructions on how to read and manipulate this map can be found here:\n\n[https://guano.swift.psu.edu/documentation](https://guano.swift.psu.edu/documentation)\n\nMore details about this burst can be found on the trigger report page here:\n\n[https://guano.swift.psu.edu/trigger_report?id=762004910](https://guano.swift.psu.edu/trigger_report?id=762004910)\n\n\nA search performed by the RAVEN pipeline [6] found a temporal coincidence between S250223dk and a sub-threshold Swift/BAT trigger with ID 762004910. The GRB trigger time is 10.24 seconds before the GW candidate event. The estimated joint false alarm rate for the coincidence using just timing info is 1.9e-07 Hz, or about one in a month. The GRB candidate was found during a joint targeted search between the LIGO/Virgo/KAGRA collaboration and Swift/BAT-GUANO, and has a false alarm rate of 7.4e-05 Hz, or about one in 3 hours.Combined sky maps are also available:\n * combined-ext.multiorder.fits,0, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,1, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,2, an initial localization, distributed via GCN notice about 13 hours after the candidate event time.\n\nFor the combined-ext.multiorder.fits,2 sky map, the 90% credible region is <1 deg2. The joint localization is dominated by the Swift/BAT-GUANO candidate. Considering the overlap of the individual sky maps, the estimated joint false alarm rate for the spatial and temporal coincidence is 5.1e-09 Hz, or about one in 6 years.\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625\n \n [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n \n [3] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n \n [4] Tohuvavohu et al. ApJ, 900, 1 (2020)\n \n [5] DeLaunay & Tohuvavohu, ApJ, 941, 169 (2022)\n \n [6] Urban, A. L. 2016, Ph.D. Thesis https://dc.uwm.edu/etd/1218 and Piotrzkowski, B. J. 2022, Ph.D. Thesis https://dc.uwm.edu/etd/3060\n\n",
"published": "2025-02-24T14:59:07.865378Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-24T14:59:07.865428Z",
"modified": "2025-02-24T14:59:07.873179Z",
"targets": []
},
{
"id": 182445,
"topic": "gcn.circulars",
"uuid": "6ffbf52f-b596-447f-b260-c37107bfdc8b",
"title": "LIGO/Virgo/KAGRA S250223dk: DDOTI Upper Limits on the Optical Counterpart",
"submitter": "Alan Watson at UNAM <alan@astro.unam.mx>",
"authors": "Alan Watson at UNAM <alan@astro.unam.mx>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39444"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk: DDOTI Upper Limits on the Optical Counterpart",
"createdOn": 1740372801303,
"submitter": "Alan Watson at UNAM <alan@astro.unam.mx>",
"circularId": 39444,
"submittedHow": "web"
},
"message_text": "Alan M. Watson (UNAM), William H. Lee (UNAM), Océlotl López (UNAM), Camila Angulo Valdez (UNAM), Rosa L. Becerra (U Roma), Nat Butler (ASU), Simone Dichiara (Penn State University), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), and Margarita Pereyra (UNAM), and Eleonora Troja (U Roma) report:\n\nWe imaged the field of the Swift/BAT-GUANO trigger possibly associated with LIGO/Virgo/KAGRA S250223dk (GCN Circ. 39443) with the DDOTI wide-field imager at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir in Mexico (http://ddoti.astroscu.unam.mx).\n\nWe observed the whole BAT error region from 2025-02-24 03:56 UTC to 04:24 UTC (15.9 to 16.4 hours after the GW event) at extremely high airmass. We obtained a total exposure of 24 minutes.\n\nComparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogues, we detect no uncatalogued sources within the observed BAT error region to a 5-sigma AB limiting magnitude of \n\nw > 20.0.\n\nOur photometry is in the AB system and is not corrected for Galactic extinction.\n\nWe thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.\n\n",
"published": "2025-02-24T04:55:57.536434Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-24T04:55:57.536459Z",
"modified": "2025-02-24T04:55:57.548398Z",
"targets": []
},
{
"id": 182412,
"topic": "gcn.circulars",
"uuid": "269a52f7-dde3-4eb2-9403-4fbd80446521",
"title": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO trigger with ID 762004910: Identification of a GW compact binary merger candidate possibly associated with a sub-threshold Swift/BAT-GUANO trigger",
"submitter": "minghuidu1993@gmail.com",
"authors": "minghuidu1993@gmail.com",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39443"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250223dk",
"subject": "LIGO/Virgo/KAGRA S250223dk and Swift/BAT-GUANO trigger with ID 762004910: Identification of a GW compact binary merger candidate possibly associated with a sub-threshold Swift/BAT-GUANO trigger",
"createdOn": 1740366735127,
"submitter": "minghuidu1993@gmail.com",
"circularId": 39443,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration along with the Swift/BAT-GUANO team report:\n\nWe identified the compact binary merger candidate S250223dk during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at T0 = 2025-02-23 12:01:15.360 UTC (GPS time: 1424347293.360). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS250223dk is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.4e-05 Hz, or about one in 19 hours. The event's properties can be found at this URL:\nhttps://gracedb.ligo.org/superevents/S250223dk\n\nThe classification of the GW signal, in order of descending probability, is Terrestrial (92%), BBH (8%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nFive GW-only sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN notice about a minute after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 5 minutes after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 12 hours after the candidate event time.\n * bayestar.multiorder.fits,3, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 12 hours after the candidate event time.\n * bayestar.multiorder.fits,4, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 13 hours after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,4. For the bayestar.multiorder.fits,4 sky map, the 90% credible region is 3203 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 6033 +/- 1778 Mpc (a posteriori mean +/- standard deviation).\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; [4]). \n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-45,+45] seconds around the time of the GW alert. All the requested event mode data was delivered to the ground. \n\nThe BAT likelihood search, NITRATES [5], performed on the temporal window [T0-20 s, T0+20 s], detects a burst candidate with a sqrt(TS) of 8.0 in a 8.192 s analysis time bin, starting at T0 - 10.240 s \n\nThe 90% credible area is 2666 deg2 and the 50% credible area is <1 deg2.\nThe integrated probability inside the coded field of view is 83%. \n\nThe joint LVK-Swift/BAT localization probability map peaks at \nRA = 85.341 deg,\nDec = -47.554 deg.\nA circle with a radius of 5 arcmin around this position contains 52% of the integrated joint probability.\n\nSwift has already initiated TOO followup of this position with XRT and UVOT. Results will be reported in future circulars. We encourage followup by other, more sensitive, facilities.\n\nA plot of the Swift/BAT probability skymap can be viewed here: https://guano.swift.psu.edu/trigger_report?id=762004910/#:~:text=Probability%20Skymap\n\nThe Swift/BAT probability skymap file can be downloaded from the link here:\nhttps://guano.swift.psu.edu/files/762004910/0_n_PROBMAP\n\nInstructions on how to read and manipulate this map can be found here:\nhttps://guano.swift.psu.edu/documentation\n\nMore details about this burst can be found on the trigger report page here:\nhttps://guano.swift.psu.edu/trigger_report?id=762004910\n\n\nA search performed by the RAVEN pipeline [6] found a temporal coincidence between S250223dk and a sub-threshold Swift/BAT trigger with ID 762004910. The GRB trigger time is 10.24 seconds before the GW candidate event. The estimated joint false alarm rate for the coincidence using just timing info is 1.9e-07 Hz, or about one in a month. The GRB candidate was found during a joint targeted search between the LIGO/Virgo/KAGRA collaboration and Swift/BAT-GUANO, and has a false alarm rate of 7.4e-05 Hz, or about one in 3 hours.Combined sky maps are also available:\n * combined-ext.multiorder.fits,0, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,1, an initial localization, distributed via GCN notice about 12 hours after the candidate event time.\n * combined-ext.multiorder.fits,2, an initial localization, distributed via GCN notice about 13 hours after the candidate event time.\n\nFor the combined-ext.multiorder.fits,2 sky map, the 90% credible region is <1 deg2. The joint localization is dominated by the Swift/BAT-GUANO candidate. Considering the overlap of the individual sky maps, the estimated joint false alarm rate for the spatial and temporal coincidence is 5.1e-09 Hz, or about one in 6 years.\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625\n [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [3] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n [4] Tohuvavohu et al. ApJ, 900, 1 (2020)\n [5] DeLaunay & Tohuvavohu, ApJ, 941, 169 (2022)\n [6] Urban, A. L. 2016, Ph.D. Thesis https://dc.uwm.edu/etd/1218 and Piotrzkowski, B. J. 2022, Ph.D. Thesis https://dc.uwm.edu/etd/3060\n\n",
"published": "2025-02-24T03:12:27.435976Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-02-24T03:12:27.436004Z",
"modified": "2025-02-24T03:12:27.447883Z",
"targets": []
}
]
},
{
"event_id": "S250303fg",
"sequences": [
{
"id": 8234,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185355,
"topic": "igwn.gwalert",
"uuid": "89760980-cb15-42ae-8714-31c6516d7572",
"title": "S250303fg - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303fg/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303fg/view/"
},
"event": {
"far": 1.96063e-05,
"time": "2025-03-03T22:43:51.590Z",
"group": "CBC",
"search": "BBH",
"area_50": 1046.5991755783252,
"area_90": 3227.0840658369375,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "91a8dbdf5682770dbbd0896ffe08aaba",
"classification": {
"BBH": 0.0008506594750748997,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9991493405249251
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-03T22:45:17Z",
"superevent_id": "S250303fg",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T22:45:18.437790Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T22:45:18.437840Z",
"modified": "2025-03-03T22:45:18.450864Z"
}
},
{
"id": 8236,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185357,
"topic": "igwn.gwalert",
"uuid": "f3f97b98-8ce2-43b6-b33e-7793a4133eac",
"title": "S250303fg - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303fg/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303fg/view/"
},
"event": {
"far": 1.96063e-05,
"time": "2025-03-03T22:43:51.590Z",
"group": "CBC",
"search": "BBH",
"area_50": 1046.5991755783252,
"area_90": 3227.0840658369375,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "91a8dbdf5682770dbbd0896ffe08aaba",
"classification": {
"BBH": 0.0008506594750748997,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9991493405249251
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-03T22:49:51Z",
"superevent_id": "S250303fg",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T22:49:52.718765Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T22:49:52.718812Z",
"modified": "2025-03-03T22:49:52.733070Z"
}
}
],
"references": []
},
{
"event_id": "S250303fn",
"sequences": [
{
"id": 8238,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185359,
"topic": "igwn.gwalert",
"uuid": "0a4dbea7-f209-411e-be9e-3f1aa3b462a4",
"title": "S250303fn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303fn/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303fn/view/"
},
"event": {
"far": 6.735931037837872e-06,
"time": "2025-03-03T22:53:35.951Z",
"group": "CBC",
"search": "AllSky",
"area_50": 5977.449341193931,
"area_90": 28170.05190786761,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "2b8ab867266897b094773fa0299ebb42",
"classification": {
"BBH": 0.0,
"BNS": 0.003805860954470483,
"NSBH": 0.001930322860799099,
"Terrestrial": 0.9942638161847304
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-03T22:54:01Z",
"superevent_id": "S250303fn",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T22:54:02.844753Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T22:54:02.844784Z",
"modified": "2025-03-03T22:54:02.853810Z"
}
},
{
"id": 8239,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185360,
"topic": "igwn.gwalert",
"uuid": "731dc794-9add-46bf-806c-82b03fa3090e",
"title": "S250303fn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250303fn/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250303fn/view/"
},
"event": {
"far": 6.735931037837872e-06,
"time": "2025-03-03T22:53:35.951Z",
"group": "CBC",
"search": "AllSky",
"area_50": 5977.449341193931,
"area_90": 28170.05190786761,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "2b8ab867266897b094773fa0299ebb42",
"classification": {
"BBH": 0.0,
"BNS": 0.003805860954470483,
"NSBH": 0.001930322860799099,
"Terrestrial": 0.9942638161847304
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-03T22:58:36Z",
"superevent_id": "S250303fn",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-03T22:58:38.211657Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-03T22:58:38.211690Z",
"modified": "2025-03-03T22:58:38.218411Z"
}
}
],
"references": []
},
{
"event_id": "S250304c",
"sequences": [
{
"id": 8240,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185374,
"topic": "igwn.gwalert",
"uuid": "7e53b5cc-d608-4d03-9109-7478c6a45d6b",
"title": "S250304c - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304c/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304c/view/"
},
"event": {
"far": 1.182134241095953e-05,
"time": "2025-03-04T00:23:43.667Z",
"group": "CBC",
"search": "AllSky",
"area_50": 791.4539074341305,
"area_90": 3076.0112096989265,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "42158f029aa9d37e88dbd0bb9a208bf0",
"classification": {
"BBH": 0.09754587498883384,
"BNS": 1.0472822677198416e-15,
"NSBH": 7.519994041807323e-14,
"Terrestrial": 0.9024541250110899
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-04T00:24:12Z",
"superevent_id": "S250304c",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T00:24:13.025274Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T00:24:13.025329Z",
"modified": "2025-03-04T00:24:13.040655Z"
}
},
{
"id": 8241,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185375,
"topic": "igwn.gwalert",
"uuid": "565b2ea1-418a-43bf-8e7e-9f8617e2cd2e",
"title": "S250304c - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304c/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250304c/view/"
},
"event": {
"far": 1.321875982724316e-05,
"time": "2025-03-04T00:23:43.665Z",
"group": "CBC",
"search": "AllSky",
"area_50": 790.1949669663137,
"area_90": 3036.564408374002,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6beda3055770a98ef40c9ac6a7785588",
"classification": {
"BBH": 0.08484249675929831,
"BNS": 1.0679310139259976e-15,
"NSBH": 7.671453852411583e-14,
"Terrestrial": 0.915157503240624
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-04T00:28:48Z",
"superevent_id": "S250304c",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T00:28:49.229594Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T00:28:49.229626Z",
"modified": "2025-03-04T00:28:49.238123Z"
}
}
],
"references": []
},
{
"event_id": "S250304d",
"sequences": [
{
"id": 8242,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185376,
"topic": "igwn.gwalert",
"uuid": "127ffe56-0d79-4140-8e34-a968d6922a08",
"title": "S250304d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250304d/view/"
},
"event": {
"far": 1.0562248520596778e-05,
"time": "2025-03-04T00:30:07.342Z",
"group": "Burst",
"search": "AllSky",
"area_50": 6751.2780820786265,
"area_90": 21962.63610788582,
"duration": 0.125,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "47fab254c6bd687e6fbdc05c2511307d",
"classification": {},
"skymap_version": 0,
"central_frequency": 440.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-04T00:30:55Z",
"superevent_id": "S250304d",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T00:30:55.562936Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T00:30:55.562990Z",
"modified": "2025-03-04T00:30:55.573641Z"
}
},
{
"id": 8243,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185377,
"topic": "igwn.gwalert",
"uuid": "58e08723-4bd9-4765-b9d2-e2987256661f",
"title": "S250304d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250304d/view/"
},
"event": {
"far": 1.0562248520596778e-05,
"time": "2025-03-04T00:30:07.342Z",
"group": "Burst",
"search": "AllSky",
"area_50": 6751.2780820786265,
"area_90": 21962.63610788582,
"duration": 0.125,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "47fab254c6bd687e6fbdc05c2511307d",
"classification": {},
"skymap_version": 0,
"central_frequency": 440.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-04T00:35:30Z",
"superevent_id": "S250304d",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T00:35:31.786695Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T00:35:31.786740Z",
"modified": "2025-03-04T00:35:31.798507Z"
}
}
],
"references": []
},
{
"event_id": "S250304j",
"sequences": [
{
"id": 8244,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185378,
"topic": "igwn.gwalert",
"uuid": "324fb1dc-4c2c-446a-b418-dba409714bbc",
"title": "S250304j - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250304j/view/"
},
"event": {
"far": 3.283235770639056e-06,
"time": "2025-03-04T01:02:54.926Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7445.373926668263,
"area_90": 22827.94785609853,
"duration": 0.09375,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "c66c6ad8b794969063b9d247a70e2f6f",
"classification": {},
"skymap_version": 0,
"central_frequency": 112.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-04T01:03:40Z",
"superevent_id": "S250304j",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T01:03:41.232898Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T01:03:41.232929Z",
"modified": "2025-03-04T01:03:41.245752Z"
}
},
{
"id": 8245,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185379,
"topic": "igwn.gwalert",
"uuid": "95340ab7-aec7-4896-ac8d-0e080919c71c",
"title": "S250304j - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250304j/view/"
},
"event": {
"far": 3.283235770639056e-06,
"time": "2025-03-04T01:02:54.926Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7445.373926668263,
"area_90": 22827.94785609853,
"duration": 0.09375,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "c66c6ad8b794969063b9d247a70e2f6f",
"classification": {},
"skymap_version": 0,
"central_frequency": 112.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-04T01:08:14Z",
"superevent_id": "S250304j",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T01:08:15.409707Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T01:08:15.409741Z",
"modified": "2025-03-04T01:08:15.420377Z"
}
}
],
"references": []
},
{
"event_id": "S250304s",
"sequences": [
{
"id": 8246,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185380,
"topic": "igwn.gwalert",
"uuid": "58a5d95b-1fb2-4d80-9525-225dc7a55058",
"title": "S250304s - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304s/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304s/view/"
},
"event": {
"far": 2.025689846909704e-06,
"time": "2025-03-04T01:41:31.699Z",
"group": "CBC",
"search": "AllSky",
"area_50": 409.1031961876182,
"area_90": 1443.585069763207,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004656290674439494,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "c4eb23051ddadc9e119ff1b5b0853f6a",
"classification": {
"BBH": 0.45194501690959543,
"BNS": 2.0840298851848893e-17,
"NSBH": 1.3337296102110268e-15,
"Terrestrial": 0.5480549830904032
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-04T01:41:52Z",
"superevent_id": "S250304s",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T01:41:53.994124Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T01:41:53.994157Z",
"modified": "2025-03-04T01:41:54.013477Z"
}
},
{
"id": 8247,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185381,
"topic": "igwn.gwalert",
"uuid": "c1e28817-c45d-46f6-969f-f5a2745d64a8",
"title": "S250304s - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304s/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250304s/view/"
},
"event": {
"far": 3.269475373004283e-06,
"time": "2025-03-04T01:41:31.696Z",
"group": "CBC",
"search": "AllSky",
"area_50": 366.45658784032577,
"area_90": 1319.9990805058626,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0005497076023391813,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6c0580713c6fa918783aacc1b9a657fb",
"classification": {
"BBH": 0.35964310164750035,
"BNS": 3.808864966431752e-17,
"NSBH": 2.4224836764438367e-15,
"Terrestrial": 0.6403568983524972
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-04T01:46:29Z",
"superevent_id": "S250304s",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T01:46:30.265686Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T01:46:30.265740Z",
"modified": "2025-03-04T01:46:30.280496Z"
}
}
],
"references": []
},
{
"event_id": "S250304t",
"sequences": [
{
"id": 8248,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185382,
"topic": "igwn.gwalert",
"uuid": "7fb1162f-8b71-47da-aab3-d6fc5ffe3817",
"title": "S250304t - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304t/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304t/view/"
},
"event": {
"far": 1.32792e-05,
"time": "2025-03-04T01:47:47.125Z",
"group": "CBC",
"search": "BBH",
"area_50": 2432.272983821962,
"area_90": 7747.519638944283,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "007cded1dcc23a1e4ca05dfc89202de4",
"classification": {
"BBH": 0.001969656602822001,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.998030343397178
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-04T01:48:59Z",
"superevent_id": "S250304t",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T01:48:59.926541Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T01:48:59.926575Z",
"modified": "2025-03-04T01:48:59.936263Z"
}
},
{
"id": 8249,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185383,
"topic": "igwn.gwalert",
"uuid": "84e74e95-ffb2-4abd-9e4e-e86da07d04f8",
"title": "S250304t - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304t/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304t/view/"
},
"event": {
"far": 1.32792e-05,
"time": "2025-03-04T01:47:47.125Z",
"group": "CBC",
"search": "BBH",
"area_50": 2432.272983821962,
"area_90": 7747.519638944283,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "007cded1dcc23a1e4ca05dfc89202de4",
"classification": {
"BBH": 0.001969656602822001,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.998030343397178
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-04T01:53:35Z",
"superevent_id": "S250304t",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T01:53:37.266455Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T01:53:37.266490Z",
"modified": "2025-03-04T01:53:37.276198Z"
}
}
],
"references": []
},
{
"event_id": "S250304cb",
"sequences": [
{
"id": 8250,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185486,
"topic": "igwn.gwalert",
"uuid": "dd54da14-fba2-4e0b-8821-76abe9b90b1f",
"title": "S250304cb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304cb/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304cb/view/"
},
"event": {
"far": 5.620929127386178e-08,
"time": "2025-03-04T06:22:45.563Z",
"group": "CBC",
"search": "AllSky",
"area_50": 346.05126109112933,
"area_90": 1526.6751406391127,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.007425851524485515,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": true,
"skymap_hash": "38bdc6943e6197a45fa21eee108a2f2b",
"classification": {
"BBH": 0.9616631168128694,
"BNS": 1.6666395415462835e-18,
"NSBH": 1.0566842709351674e-16,
"Terrestrial": 0.038336883187130466
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-04T06:23:14Z",
"superevent_id": "S250304cb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T06:23:16.261691Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T06:23:16.261724Z",
"modified": "2025-03-04T06:23:16.269869Z"
}
},
{
"id": 8251,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185487,
"topic": "igwn.gwalert",
"uuid": "7f3aadc3-4e74-46d7-8659-32d1aad554f7",
"title": "S250304cb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304cb/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250304cb/view/"
},
"event": {
"far": 5.620929127386178e-08,
"time": "2025-03-04T06:22:45.568Z",
"group": "CBC",
"search": "AllSky",
"area_50": 406.84759451611325,
"area_90": 1568.8496463109736,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.01873767752715121,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": true,
"skymap_hash": "b0821a2cea5755a405b089ddbe3d8067",
"classification": {
"BBH": 0.9616631168128694,
"BNS": 1.6666395415462835e-18,
"NSBH": 1.0566842709351674e-16,
"Terrestrial": 0.038336883187130466
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-04T06:27:52Z",
"superevent_id": "S250304cb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T06:27:53.441853Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T06:27:53.441885Z",
"modified": "2025-03-04T06:27:53.449748Z"
}
},
{
"id": 8252,
"sequence_number": 3,
"sequence_type": "INITIAL",
"message": {
"id": 185543,
"topic": "igwn.gwalert",
"uuid": "7bd0d040-d1a2-4df7-9a76-855e474f2ae3",
"title": "S250304cb - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304cb/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250304cb/view/"
},
"event": {
"far": 5.620929127386178e-08,
"time": "2025-03-04T06:22:45.568Z",
"group": "CBC",
"search": "AllSky",
"area_50": 406.84759451611325,
"area_90": 1568.8496463109736,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.01873767752715121,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": true,
"skymap_hash": "b0821a2cea5755a405b089ddbe3d8067",
"classification": {
"BBH": 0.9616631168128694,
"BNS": 1.6666395415462835e-18,
"NSBH": 1.0566842709351674e-16,
"Terrestrial": 0.038336883187130466
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2025-03-04T06:53:09Z",
"superevent_id": "S250304cb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T06:53:11.397811Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T06:53:11.397842Z",
"modified": "2025-03-04T06:53:11.408619Z"
}
}
],
"references": [
{
"id": 185544,
"topic": "gcn.circulars",
"uuid": "925d9c1d-e150-4016-ada2-b78a4ab01012",
"title": "LIGO/Virgo/KAGRA S250304cb: Identification of a GW compact binary merger candidate",
"submitter": "Pan Guo at KAGRA <panguocas@gmail.com>",
"authors": "Pan Guo at KAGRA <panguocas@gmail.com>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39582"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250304cb",
"subject": "LIGO/Virgo/KAGRA S250304cb: Identification of a GW compact binary merger candidate",
"createdOn": 1741071531509,
"submitter": "Pan Guo at KAGRA <panguocas@gmail.com>",
"circularId": 39582,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250304cb during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-03-04 06:22:45.568 UTC (GPS time: 1425104583.568). The candidate was found by the GstLAL [1] and MBTA [2] analysis pipelines.\n\nS250304cb is an event of interest because its false alarm rate, as estimated by the online analysis, is 5.6e-08 Hz, or about one in 6 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250304cb\n\nThe classification of the GW signal, in order of descending probability, is BBH (96%), Terrestrial (4%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [3] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [3] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is 2%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [4], distributed via GCN notice about 28 seconds after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [4], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 1569 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1768 +/- 541 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625\n [2] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913\n [3] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [4] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
"published": "2025-03-04T07:01:34.616897Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-03-04T07:01:34.616927Z",
"modified": "2025-03-04T07:01:34.631361Z",
"targets": []
}
]
},
{
"event_id": "S250304ck",
"sequences": [
{
"id": 8253,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185545,
"topic": "igwn.gwalert",
"uuid": "b6ebcf5f-e027-4614-8d0a-34705111b7a4",
"title": "S250304ck - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304ck/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304ck/view/"
},
"event": {
"far": 1.374398140949607e-06,
"time": "2025-03-04T07:11:02.602Z",
"group": "CBC",
"search": "AllSky",
"area_50": 511.1298299336007,
"area_90": 1948.0005505351187,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.48284072317804516,
"HasMassGap": 0.8023148034729537,
"HasRemnant": 6.493530610034361e-06
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "5d2a272baf03dfbcde0969597de426c6",
"classification": {
"BBH": 0.011509015754636089,
"BNS": 0.0,
"NSBH": 0.022082893493090092,
"Terrestrial": 0.9664080907522739
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-04T07:11:27Z",
"superevent_id": "S250304ck",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T07:11:28.348184Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T07:11:28.348236Z",
"modified": "2025-03-04T07:11:28.360887Z"
}
},
{
"id": 8254,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185552,
"topic": "igwn.gwalert",
"uuid": "45d594c7-7368-4aef-97f0-41fc8ec0ecaa",
"title": "S250304ck - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304ck/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250304ck/view/"
},
"event": {
"far": 1.374398140949607e-06,
"time": "2025-03-04T07:11:02.601Z",
"group": "CBC",
"search": "AllSky",
"area_50": 537.3577563464497,
"area_90": 1895.125050886815,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.06734884807185774,
"HasMassGap": 0.8649724553933065,
"HasRemnant": 6.10564925640235e-05
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "6a029236f839a5f2b3a031c119e60ed9",
"classification": {
"BBH": 0.011580253878795466,
"BNS": 0.0,
"NSBH": 0.022011655368930683,
"Terrestrial": 0.9664080907522739
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-04T07:16:04Z",
"superevent_id": "S250304ck",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T07:16:05.624111Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T07:16:05.624144Z",
"modified": "2025-03-04T07:16:05.631350Z"
}
}
],
"references": []
},
{
"event_id": "S250304dc",
"sequences": [
{
"id": 8255,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185560,
"topic": "igwn.gwalert",
"uuid": "5e6a3313-9a98-48fe-a11f-581897c88427",
"title": "S250304dc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304dc/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304dc/view/"
},
"event": {
"far": 1.840285280586203e-05,
"time": "2025-03-04T09:21:02.412Z",
"group": "CBC",
"search": "AllSky",
"area_50": 943.3660572173517,
"area_90": 4219.968448121747,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "b9ba8c65efe222f7e5024defd26253df",
"classification": {
"BBH": 0.06086933364081993,
"BNS": 5.260763598130699e-14,
"NSBH": 3.6603370041561714e-12,
"Terrestrial": 0.9391306663554672
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-04T09:21:28Z",
"superevent_id": "S250304dc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T09:21:30.337846Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T09:21:30.337878Z",
"modified": "2025-03-04T09:21:30.349894Z"
}
},
{
"id": 8256,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185561,
"topic": "igwn.gwalert",
"uuid": "e395a069-1439-4842-a687-cb0c871eaa19",
"title": "S250304dc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304dc/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250304dc/view/"
},
"event": {
"far": 1.556361722719764e-05,
"time": "2025-03-04T09:21:02.411Z",
"group": "CBC",
"search": "AllSky",
"area_50": 963.9287515250253,
"area_90": 4185.55740866809,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "5517be7dd61447fa236c5db37072e337",
"classification": {
"BBH": 0.07012647199812677,
"BNS": 8.500636296999509e-14,
"NSBH": 5.906114366252306e-12,
"Terrestrial": 0.9298735279958821
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-04T09:26:05Z",
"superevent_id": "S250304dc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T09:26:05.494276Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T09:26:05.494307Z",
"modified": "2025-03-04T09:26:05.503380Z"
}
}
],
"references": []
},
{
"event_id": "S250304df",
"sequences": [
{
"id": 8257,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185562,
"topic": "igwn.gwalert",
"uuid": "bf26fa3a-e3ca-4564-81f6-25e0340c84e1",
"title": "S250304df - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304df/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304df/view/"
},
"event": {
"far": 4.155902e-07,
"time": "2025-03-04T09:36:02.103Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1367.8388182828994,
"area_90": 4658.079730921977,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.05367326492825584,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "9b59c4b126dd1fb00fa53ce3f6a99c68",
"classification": {
"BBH": 0.731066137,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.268933863
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-04T09:36:32Z",
"superevent_id": "S250304df",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T09:36:33.426255Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T09:36:33.426285Z",
"modified": "2025-03-04T09:36:33.435679Z"
}
},
{
"id": 8258,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185563,
"topic": "igwn.gwalert",
"uuid": "fb39473a-b489-479b-b4ac-b8bbbd9a2a0b",
"title": "S250304df - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304df/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304df/view/"
},
"event": {
"far": 4.155902e-07,
"time": "2025-03-04T09:36:02.103Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1367.8388182828994,
"area_90": 4658.079730921977,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.05367326492825584,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "9b59c4b126dd1fb00fa53ce3f6a99c68",
"classification": {
"BBH": 0.731066137,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.268933863
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-04T09:41:08Z",
"superevent_id": "S250304df",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T09:41:09.602553Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T09:41:09.602585Z",
"modified": "2025-03-04T09:41:09.609526Z"
}
}
],
"references": []
},
{
"event_id": "S250304dj",
"sequences": [
{
"id": 8259,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185699,
"topic": "igwn.gwalert",
"uuid": "ad20092a-6635-4d3d-9a55-9ad7357be1e3",
"title": "S250304dj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304dj/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304dj/view/"
},
"event": {
"far": 2.204608e-05,
"time": "2025-03-04T14:44:50.129Z",
"group": "CBC",
"search": "AllSky",
"area_50": 5116.334061207274,
"area_90": 15803.06004568106,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.09986857508788455,
"HasRemnant": 0.6464560044471385
},
"instruments": [
"H1",
"V1"
],
"significant": false,
"skymap_hash": "0e59a64020ee5fa5d2c38ec851fa1a5f",
"classification": {
"BBH": 0.0,
"BNS": 0.0,
"NSBH": 0.000577895,
"Terrestrial": 0.999422105
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-04T14:45:19Z",
"superevent_id": "S250304dj",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T14:45:21.200590Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T14:45:21.200615Z",
"modified": "2025-03-04T14:45:21.208397Z"
}
},
{
"id": 8260,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185700,
"topic": "igwn.gwalert",
"uuid": "16905f2c-7811-4fce-a61c-2358dabed17f",
"title": "S250304dj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250304dj/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250304dj/view/"
},
"event": {
"far": 2.204608e-05,
"time": "2025-03-04T14:44:50.129Z",
"group": "CBC",
"search": "AllSky",
"area_50": 5116.334061207274,
"area_90": 15803.06004568106,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.09986857508788455,
"HasRemnant": 0.6464560044471385
},
"instruments": [
"H1",
"V1"
],
"significant": false,
"skymap_hash": "0e59a64020ee5fa5d2c38ec851fa1a5f",
"classification": {
"BBH": 0.0,
"BNS": 0.0,
"NSBH": 0.000577895,
"Terrestrial": 0.999422105
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-04T14:49:54Z",
"superevent_id": "S250304dj",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-04T14:49:55.409413Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-04T14:49:55.409462Z",
"modified": "2025-03-04T14:49:55.418484Z"
}
}
],
"references": []
},
{
"event_id": "S250305b",
"sequences": [
{
"id": 8261,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185710,
"topic": "igwn.gwalert",
"uuid": "2278eaf6-2ad3-4566-a4d4-9c581940de5a",
"title": "S250305b - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250305b/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250305b/view/"
},
"event": {
"far": 2.150284672097769e-05,
"time": "2025-03-05T04:00:56.575Z",
"group": "CBC",
"search": "AllSky",
"area_50": 3752.481887739127,
"area_90": 16789.230078804183,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.10387806435804496,
"HasRemnant": 0.0
},
"instruments": [
"L1",
"V1"
],
"significant": false,
"skymap_hash": "8b0cee31095643ce6f61d75fe6540890",
"classification": {
"BBH": 0.0020069470330295967,
"BNS": 0.0,
"NSBH": 0.0014651466258610102,
"Terrestrial": 0.9965279063411094
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-05T04:01:25Z",
"superevent_id": "S250305b",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-05T04:01:26.345830Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-05T04:01:26.345851Z",
"modified": "2025-03-05T04:01:26.372024Z"
}
},
{
"id": 8262,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185711,
"topic": "igwn.gwalert",
"uuid": "889da914-4a6d-411b-81e6-24a08bfddc8a",
"title": "S250305b - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250305b/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250305b/view/"
},
"event": {
"far": 2.150284672097769e-05,
"time": "2025-03-05T04:00:56.575Z",
"group": "CBC",
"search": "AllSky",
"area_50": 3752.481887739127,
"area_90": 16789.230078804183,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.10387806435804496,
"HasRemnant": 0.0
},
"instruments": [
"L1",
"V1"
],
"significant": false,
"skymap_hash": "8b0cee31095643ce6f61d75fe6540890",
"classification": {
"BBH": 0.0020069470330295967,
"BNS": 0.0,
"NSBH": 0.0014651466258610102,
"Terrestrial": 0.9965279063411094
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-05T04:06:00Z",
"superevent_id": "S250305b",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-05T04:06:01.051883Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-05T04:06:01.051898Z",
"modified": "2025-03-05T04:06:01.062268Z"
}
}
],
"references": []
},
{
"event_id": "S250305c",
"sequences": [
{
"id": 8263,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185712,
"topic": "igwn.gwalert",
"uuid": "289909a4-2b0d-4dc4-bee2-2dc803345350",
"title": "S250305c - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250305c/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250305c/view/"
},
"event": {
"far": 1.435562e-05,
"time": "2025-03-05T04:44:53.301Z",
"group": "CBC",
"search": "AllSky",
"area_50": 4789.84883322013,
"area_90": 14867.247631270611,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.02333333333333333,
"HasRemnant": 1.0
},
"instruments": [
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6f11a546ba836ddd2cc93c55c921559e",
"classification": {
"BBH": 0.0,
"BNS": 0.000916441,
"NSBH": 0.00013092,
"Terrestrial": 0.998952639
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-05T04:45:25Z",
"superevent_id": "S250305c",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-05T04:45:26.145782Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-05T04:45:26.145806Z",
"modified": "2025-03-05T04:45:26.158805Z"
}
},
{
"id": 8264,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185713,
"topic": "igwn.gwalert",
"uuid": "ab611273-f240-406b-ab11-956732807c9c",
"title": "S250305c - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250305c/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250305c/view/"
},
"event": {
"far": 1.435562e-05,
"time": "2025-03-05T04:44:53.301Z",
"group": "CBC",
"search": "AllSky",
"area_50": 4789.84883322013,
"area_90": 14867.247631270611,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.02333333333333333,
"HasRemnant": 1.0
},
"instruments": [
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6f11a546ba836ddd2cc93c55c921559e",
"classification": {
"BBH": 0.0,
"BNS": 0.000916441,
"NSBH": 0.00013092,
"Terrestrial": 0.998952639
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-05T04:50:00Z",
"superevent_id": "S250305c",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-05T04:50:01.855881Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-05T04:50:01.855899Z",
"modified": "2025-03-05T04:50:01.864635Z"
}
}
],
"references": []
},
{
"event_id": "S250306ab",
"sequences": [
{
"id": 8265,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185714,
"topic": "igwn.gwalert",
"uuid": "4d40c1b2-f03a-46bd-9328-d30a92977057",
"title": "S250306ab - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306ab/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306ab/view/"
},
"event": {
"far": 3.09927e-06,
"time": "2025-03-06T04:06:38.039Z",
"group": "CBC",
"search": "BBH",
"area_50": 642.898932231754,
"area_90": 2101.5912876087623,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "db8a3e59255876e0f4322b0cdd1f3915",
"classification": {
"BBH": 0.006512482028375954,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.993487517971624
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T04:10:02Z",
"superevent_id": "S250306ab",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T04:10:02.268790Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T04:10:02.268817Z",
"modified": "2025-03-06T04:10:02.284614Z"
}
},
{
"id": 8266,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185715,
"topic": "igwn.gwalert",
"uuid": "3410f78b-6177-4fa6-b8ba-680f47a03923",
"title": "S250306ab - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306ab/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306ab/view/"
},
"event": {
"far": 3.09927e-06,
"time": "2025-03-06T04:06:38.039Z",
"group": "CBC",
"search": "BBH",
"area_50": 642.898932231754,
"area_90": 2101.5912876087623,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "db8a3e59255876e0f4322b0cdd1f3915",
"classification": {
"BBH": 0.006512482028375954,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.993487517971624
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T04:14:36Z",
"superevent_id": "S250306ab",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T04:14:37.177313Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T04:14:37.177330Z",
"modified": "2025-03-06T04:14:37.183857Z"
}
}
],
"references": []
},
{
"event_id": "S250306ao",
"sequences": [
{
"id": 8267,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185716,
"topic": "igwn.gwalert",
"uuid": "75794d0f-9bc8-4ad7-a4ab-d01ac4e5f2ed",
"title": "S250306ao - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306ao/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306ao/view/"
},
"event": {
"far": 1.00427e-05,
"time": "2025-03-06T05:35:13.449Z",
"group": "CBC",
"search": "BBH",
"area_50": 1787.6954642997857,
"area_90": 6084.03963413575,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "8a2daa6c72a83cde4f15600c4e66baf7",
"classification": {
"BBH": 0.0025230172483544644,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9974769827516455
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T05:37:36Z",
"superevent_id": "S250306ao",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T05:37:38.301282Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T05:37:38.301305Z",
"modified": "2025-03-06T05:37:38.309471Z"
}
},
{
"id": 8268,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185717,
"topic": "igwn.gwalert",
"uuid": "50e08b53-fb3f-4ed0-a2ec-e3f8573e6ec0",
"title": "S250306ao - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306ao/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306ao/view/"
},
"event": {
"far": 1.00427e-05,
"time": "2025-03-06T05:35:13.449Z",
"group": "CBC",
"search": "BBH",
"area_50": 1787.6954642997857,
"area_90": 6084.03963413575,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "8a2daa6c72a83cde4f15600c4e66baf7",
"classification": {
"BBH": 0.0025230172483544644,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9974769827516455
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T05:42:10Z",
"superevent_id": "S250306ao",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T05:42:10.931917Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T05:42:10.931934Z",
"modified": "2025-03-06T05:42:10.937909Z"
}
}
],
"references": []
},
{
"event_id": "S250306aw",
"sequences": [
{
"id": 8269,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185718,
"topic": "igwn.gwalert",
"uuid": "1150a069-e924-4e5d-9d62-35c13e09a0f8",
"title": "S250306aw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306aw/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306aw/view/"
},
"event": {
"far": 1.85111e-05,
"time": "2025-03-06T06:20:15.461Z",
"group": "CBC",
"search": "BBH",
"area_50": 1916.9466856623048,
"area_90": 7334.587165500388,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "e77d8ab88b49e9126fa484e706cb5ddf",
"classification": {
"BBH": 0.0014451795693388725,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9985548204306611
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T06:23:35Z",
"superevent_id": "S250306aw",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T06:23:36.875085Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T06:23:36.875102Z",
"modified": "2025-03-06T06:23:36.894425Z"
}
},
{
"id": 8271,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185720,
"topic": "igwn.gwalert",
"uuid": "fb71c3bb-6b5c-4b10-90a6-1468f6402e17",
"title": "S250306aw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306aw/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306aw/view/"
},
"event": {
"far": 1.85111e-05,
"time": "2025-03-06T06:20:15.461Z",
"group": "CBC",
"search": "BBH",
"area_50": 1916.9466856623048,
"area_90": 7334.587165500388,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "e77d8ab88b49e9126fa484e706cb5ddf",
"classification": {
"BBH": 0.0014451795693388725,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9985548204306611
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T06:28:10Z",
"superevent_id": "S250306aw",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T06:28:10.635920Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T06:28:10.635937Z",
"modified": "2025-03-06T06:28:10.646642Z"
}
}
],
"references": []
},
{
"event_id": "S250306ax",
"sequences": [
{
"id": 8270,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185719,
"topic": "igwn.gwalert",
"uuid": "3496a0e0-6016-48da-9024-8cdcefd8c9fa",
"title": "S250306ax - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306ax/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306ax/view/"
},
"event": {
"far": 3.732636020500153e-06,
"time": "2025-03-06T06:24:57.037Z",
"group": "CBC",
"search": "AllSky",
"area_50": 421.16804233752873,
"area_90": 1299.0167393755835,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "45347a1bd92cb20ed09918edc7661428",
"classification": {
"BBH": 0.000249600663260272,
"BNS": 0.0,
"NSBH": 0.0057057204174331385,
"Terrestrial": 0.9940446789193066
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T06:25:19Z",
"superevent_id": "S250306ax",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T06:25:21.240506Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T06:25:21.240523Z",
"modified": "2025-03-06T06:25:21.250879Z"
}
},
{
"id": 8272,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185721,
"topic": "igwn.gwalert",
"uuid": "05ecb1a0-d3b1-49f3-b2a9-f3fce7f0fdd7",
"title": "S250306ax - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306ax/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250306ax/view/"
},
"event": {
"far": 3.732636020500153e-06,
"time": "2025-03-06T06:24:57.037Z",
"group": "CBC",
"search": "AllSky",
"area_50": 415.76508949648195,
"area_90": 1250.5475313646386,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "b5ae665fb1aa42a5156d7183c1bb4c46",
"classification": {
"BBH": 0.00024195335753453276,
"BNS": 0.0,
"NSBH": 0.005713367723158877,
"Terrestrial": 0.9940446789193066
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T06:29:54Z",
"superevent_id": "S250306ax",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T06:29:56.112306Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T06:29:56.112331Z",
"modified": "2025-03-06T06:29:56.126467Z"
}
}
],
"references": []
},
{
"event_id": "S250306bg",
"sequences": [
{
"id": 8273,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185722,
"topic": "igwn.gwalert",
"uuid": "2a42c0a0-314a-49e7-8348-1211b9f70ac4",
"title": "S250306bg - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306bg/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306bg/view/"
},
"event": {
"far": 1.658675897939787e-05,
"time": "2025-03-06T07:12:48.603Z",
"group": "CBC",
"search": "AllSky",
"area_50": 462.6606219226558,
"area_90": 2702.5255375799575,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.002857142857142857,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "81bd795ee230bddb9c4334012bc16e0a",
"classification": {
"BBH": 0.06518025191450334,
"BNS": 8.200417151296149e-25,
"NSBH": 7.004260059200662e-23,
"Terrestrial": 0.9348197480854966
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T07:13:15Z",
"superevent_id": "S250306bg",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T07:13:16.150727Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T07:13:16.150744Z",
"modified": "2025-03-06T07:13:16.158920Z"
}
},
{
"id": 8274,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185723,
"topic": "igwn.gwalert",
"uuid": "3df846a4-797e-4c78-88d8-8aaf88501bfe",
"title": "S250306bg - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306bg/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250306bg/view/"
},
"event": {
"far": 1.658675897939787e-05,
"time": "2025-03-06T07:12:48.583Z",
"group": "CBC",
"search": "AllSky",
"area_50": 547.4292800889837,
"area_90": 2576.631490798283,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "71b2623de177ff03ade11d364b6630ad",
"classification": {
"BBH": 0.06518025191450334,
"BNS": 8.200417151296149e-25,
"NSBH": 7.004260059200662e-23,
"Terrestrial": 0.9348197480854966
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T07:17:50Z",
"superevent_id": "S250306bg",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T07:17:51.830020Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T07:17:51.830051Z",
"modified": "2025-03-06T07:17:51.839890Z"
}
}
],
"references": []
},
{
"event_id": "S250306bi",
"sequences": [
{
"id": 8275,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185724,
"topic": "igwn.gwalert",
"uuid": "18235246-b36b-4d91-b568-c39918da32f9",
"title": "S250306bi - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306bi/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306bi/view/"
},
"event": {
"far": 6.736736497284222e-06,
"time": "2025-03-06T07:36:43.668Z",
"group": "CBC",
"search": "AllSky",
"area_50": 763.9670405534648,
"area_90": 3321.9242477457983,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.027503605593944103,
"HasMassGap": 0.24039858109415516,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "268966a89d6b8c7216f425c7883fa5a5",
"classification": {
"BBH": 0.27013715627974316,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.7298628437202568
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T07:37:13Z",
"superevent_id": "S250306bi",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T07:37:13.797661Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T07:37:13.797679Z",
"modified": "2025-03-06T07:37:13.809124Z"
}
},
{
"id": 8276,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185725,
"topic": "igwn.gwalert",
"uuid": "35108906-8f11-4e82-8034-9397893fb28c",
"title": "S250306bi - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306bi/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250306bi/view/"
},
"event": {
"far": 3.198358895936999e-06,
"time": "2025-03-06T07:36:43.675Z",
"group": "CBC",
"search": "AllSky",
"area_50": 352.3984192830387,
"area_90": 2379.397484173658,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 8.566977518838792e-05,
"HasMassGap": 0.048637450269029214,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "f4e18909afb5982a546c12ed8ac477f7",
"classification": {
"BBH": 0.36327578348192957,
"BNS": 4.44680294161061e-21,
"NSBH": 2.7163949957365485e-19,
"Terrestrial": 0.6367242165180704
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T07:41:48Z",
"superevent_id": "S250306bi",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T07:41:49.550582Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T07:41:49.550601Z",
"modified": "2025-03-06T07:41:49.562270Z"
}
}
],
"references": []
},
{
"event_id": "S250306bl",
"sequences": [
{
"id": 8277,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185726,
"topic": "igwn.gwalert",
"uuid": "6e936425-5fb4-43af-9beb-8c5810eb4086",
"title": "S250306bl - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306bl/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306bl/view/"
},
"event": {
"far": 9.883373e-06,
"time": "2025-03-06T07:43:21.231Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1040.514296650544,
"area_90": 3687.0169834126564,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 7.248643913766079e-05,
"HasMassGap": 0.6549521023153759,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "bcd75ae0c92d9f0b41fab1b1fefaee7b",
"classification": {
"BBH": 0.079288654,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.920711346
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T07:43:52Z",
"superevent_id": "S250306bl",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T07:43:52.831203Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T07:43:52.831219Z",
"modified": "2025-03-06T07:43:52.839845Z"
}
},
{
"id": 8278,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185727,
"topic": "igwn.gwalert",
"uuid": "62c78104-c6a6-4c45-9fa2-aa8208001fc1",
"title": "S250306bl - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306bl/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306bl/view/"
},
"event": {
"far": 9.883373e-06,
"time": "2025-03-06T07:43:21.231Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1040.514296650544,
"area_90": 3687.0169834126564,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 7.248643913766079e-05,
"HasMassGap": 0.6549521023153759,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "bcd75ae0c92d9f0b41fab1b1fefaee7b",
"classification": {
"BBH": 0.079288654,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.920711346
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T07:48:27Z",
"superevent_id": "S250306bl",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T07:48:28.579949Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T07:48:28.579972Z",
"modified": "2025-03-06T07:48:28.590230Z"
}
}
],
"references": []
},
{
"event_id": "S250306bo",
"sequences": [
{
"id": 8279,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185728,
"topic": "igwn.gwalert",
"uuid": "ef4f2b2b-34d8-49ea-b215-3871ff21b8fc",
"title": "S250306bo - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250306bo/view/"
},
"event": {
"far": 5.473537735009178e-07,
"time": "2025-03-06T08:08:51.392Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7163.371261877311,
"area_90": 22531.67719933899,
"duration": 0.125,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "2ba11b677db10a1bcd7db2d430482c14",
"classification": {},
"skymap_version": 0,
"central_frequency": 296.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T08:09:30Z",
"superevent_id": "S250306bo",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T08:09:31.919825Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T08:09:31.919844Z",
"modified": "2025-03-06T08:09:31.930084Z"
}
},
{
"id": 8280,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185729,
"topic": "igwn.gwalert",
"uuid": "99c62236-0841-48fe-bfc8-bee80842d3e0",
"title": "S250306bo - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250306bo/view/"
},
"event": {
"far": 5.473537735009178e-07,
"time": "2025-03-06T08:08:51.392Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7163.371261877311,
"area_90": 22531.67719933899,
"duration": 0.125,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "2ba11b677db10a1bcd7db2d430482c14",
"classification": {},
"skymap_version": 0,
"central_frequency": 296.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T08:14:05Z",
"superevent_id": "S250306bo",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T08:14:05.617225Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T08:14:05.617247Z",
"modified": "2025-03-06T08:14:05.625084Z"
}
}
],
"references": []
},
{
"event_id": "S250306cc",
"sequences": [
{
"id": 8281,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185730,
"topic": "igwn.gwalert",
"uuid": "92c50e8a-7c5b-44f4-8083-cdece00a2371",
"title": "S250306cc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306cc/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306cc/view/"
},
"event": {
"far": 5.44137e-06,
"time": "2025-03-06T10:36:19.364Z",
"group": "Burst",
"search": "AllSky",
"area_50": 1911.0716301458267,
"area_90": 8015.254311766645,
"duration": 0.018355,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f31d7dd63e1e9e6cb1051ce0667eca1d",
"classification": {},
"skymap_version": 0,
"central_frequency": 52.638371
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T10:38:46Z",
"superevent_id": "S250306cc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T10:38:47.570496Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T10:38:47.570515Z",
"modified": "2025-03-06T10:38:47.590090Z"
}
},
{
"id": 8282,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185731,
"topic": "igwn.gwalert",
"uuid": "31a07b5c-d615-48ae-b546-979d7e95f75c",
"title": "S250306cc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306cc/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306cc/view/"
},
"event": {
"far": 5.44137e-06,
"time": "2025-03-06T10:36:19.364Z",
"group": "Burst",
"search": "AllSky",
"area_50": 1911.0716301458267,
"area_90": 8015.254311766645,
"duration": 0.018355,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f31d7dd63e1e9e6cb1051ce0667eca1d",
"classification": {},
"skymap_version": 0,
"central_frequency": 52.638371
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T10:43:21Z",
"superevent_id": "S250306cc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T10:43:21.275772Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T10:43:21.275790Z",
"modified": "2025-03-06T10:43:21.283189Z"
}
}
],
"references": []
},
{
"event_id": "S250306cr",
"sequences": [
{
"id": 8283,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185732,
"topic": "igwn.gwalert",
"uuid": "9eb5dbe3-24e2-4e6d-af56-6d2264f6a48e",
"title": "S250306cr - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250306cr/view/"
},
"event": {
"far": 1.9167048901639883e-05,
"time": "2025-03-06T11:49:57.188Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7273.318729399973,
"area_90": 22775.91165009544,
"duration": 0.0625,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "cb993814f9090050e04dfd3349cabb25",
"classification": {},
"skymap_version": 0,
"central_frequency": 272.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T11:50:36Z",
"superevent_id": "S250306cr",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T11:50:38.018525Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T11:50:38.018542Z",
"modified": "2025-03-06T11:50:38.030004Z"
}
},
{
"id": 8284,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185733,
"topic": "igwn.gwalert",
"uuid": "9c7381cf-82cb-4c12-8730-848c6f4052aa",
"title": "S250306cr - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250306cr/view/"
},
"event": {
"far": 1.9167048901639883e-05,
"time": "2025-03-06T11:49:57.188Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7273.318729399973,
"area_90": 22775.91165009544,
"duration": 0.0625,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "cb993814f9090050e04dfd3349cabb25",
"classification": {},
"skymap_version": 0,
"central_frequency": 272.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T11:55:12Z",
"superevent_id": "S250306cr",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T11:55:13.744258Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T11:55:13.744275Z",
"modified": "2025-03-06T11:55:13.753791Z"
}
}
],
"references": []
},
{
"event_id": "S250306ej",
"sequences": [
{
"id": 8285,
"sequence_number": 1,
"sequence_type": "EARLY_WARNING",
"message": {
"id": 185734,
"topic": "igwn.gwalert",
"uuid": "cc4c2464-5bcc-4ee3-9fc2-ab878fb2bc86",
"title": "S250306ej - EARLYWARNING",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306ej/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306ej/view/"
},
"event": {
"far": 9.271082e-08,
"time": "2025-03-06T15:00:44.771Z",
"group": "CBC",
"search": "EarlyWarning",
"area_50": 769.6322726586401,
"area_90": 3373.1211601036803,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "4299aab7124c21bf38530d035e36ace6",
"classification": {
"BBH": 0.0,
"BNS": 0.003158278,
"NSBH": 0.0,
"Terrestrial": 0.996841722
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "EARLYWARNING",
"sequence_num": 1,
"time_created": "2025-03-06T15:00:52Z",
"superevent_id": "S250306ej",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T15:00:53.325380Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T15:00:53.325398Z",
"modified": "2025-03-06T15:00:53.340846Z"
}
},
{
"id": 8287,
"sequence_number": 2,
"sequence_type": "RETRACTION",
"message": {
"id": 185736,
"topic": "igwn.gwalert",
"uuid": "9bafc7b7-1b50-47e9-bb1a-0e708f31a000",
"title": "S250306ej - RETRACTION",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250306ej/view/"
},
"event": null,
"alert_type": "RETRACTION",
"sequence_num": 2,
"time_created": "2025-03-06T15:09:32Z",
"superevent_id": "S250306ej",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T15:09:33.576246Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T15:09:33.576263Z",
"modified": "2025-03-06T15:09:33.584124Z"
}
}
],
"references": []
},
{
"event_id": "S250306em",
"sequences": [
{
"id": 8286,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185735,
"topic": "igwn.gwalert",
"uuid": "b2a2de6f-b796-458e-b2ac-06743c188917",
"title": "S250306em - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250306em/view/"
},
"event": {
"far": 1.6802402453378707e-05,
"time": "2025-03-06T15:05:49.737Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7130.638809714074,
"area_90": 22540.070135791102,
"duration": 0.09375,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "88cd2da6d53d33cbc9b215410cc42852",
"classification": {},
"skymap_version": 0,
"central_frequency": 232.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T15:06:28Z",
"superevent_id": "S250306em",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T15:06:29.140361Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T15:06:29.140378Z",
"modified": "2025-03-06T15:06:29.154450Z"
}
},
{
"id": 8288,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185737,
"topic": "igwn.gwalert",
"uuid": "511d0d82-98bf-4294-9290-900ad9fcf2c5",
"title": "S250306em - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250306em/view/"
},
"event": {
"far": 1.6802402453378707e-05,
"time": "2025-03-06T15:05:49.737Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7130.638809714074,
"area_90": 22540.070135791102,
"duration": 0.09375,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "88cd2da6d53d33cbc9b215410cc42852",
"classification": {},
"skymap_version": 0,
"central_frequency": 232.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T15:11:03Z",
"superevent_id": "S250306em",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T15:11:03.916906Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T15:11:03.916928Z",
"modified": "2025-03-06T15:11:03.928093Z"
}
}
],
"references": []
},
{
"event_id": "S250306ev",
"sequences": [
{
"id": 8289,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185738,
"topic": "igwn.gwalert",
"uuid": "08bbb0e0-a34e-44fb-b7a1-fda778723d34",
"title": "S250306ev - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306ev/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306ev/view/"
},
"event": {
"far": 1.835022657328707e-05,
"time": "2025-03-06T15:32:56.896Z",
"group": "CBC",
"search": "AllSky",
"area_50": 445.1928229316984,
"area_90": 1571.3675272466073,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.666514489140276,
"HasRemnant": 0.07490192626541008
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "8d69a74443780b0270a66b512894aa3c",
"classification": {
"BBH": 0.0,
"BNS": 0.0006836527001574147,
"NSBH": 0.0007955540624983943,
"Terrestrial": 0.9985207932373442
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T15:33:24Z",
"superevent_id": "S250306ev",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T15:33:25.154492Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T15:33:25.154510Z",
"modified": "2025-03-06T15:33:25.162258Z"
}
},
{
"id": 8290,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185739,
"topic": "igwn.gwalert",
"uuid": "992f1144-5a9f-40c1-8945-e1d6d47b7cc2",
"title": "S250306ev - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306ev/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250306ev/view/"
},
"event": {
"far": 1.835022657328707e-05,
"time": "2025-03-06T15:32:56.896Z",
"group": "CBC",
"search": "AllSky",
"area_50": 394.04836642664293,
"area_90": 1442.745776117996,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.5274568131979855,
"HasRemnant": 0.10714129001336334
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "18cb72fc1a011f3b1ad1856ba7bada7b",
"classification": {
"BBH": 0.0,
"BNS": 0.0006687531884019171,
"NSBH": 0.0008104535742538654,
"Terrestrial": 0.9985207932373442
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T15:38:00Z",
"superevent_id": "S250306ev",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T15:38:00.849923Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T15:38:00.849954Z",
"modified": "2025-03-06T15:38:00.861648Z"
}
}
],
"references": []
},
{
"event_id": "S250306fg",
"sequences": [
{
"id": 8292,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185741,
"topic": "igwn.gwalert",
"uuid": "d908ff90-ae7d-4cdb-a53b-cb368f1bfafa",
"title": "S250306fg - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306fg/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250306fg/view/"
},
"event": {
"far": 1.88419063231176e-05,
"time": "2025-03-06T22:10:44.509Z",
"group": "CBC",
"search": "AllSky",
"area_50": 737.3194673180101,
"area_90": 2557.3277369584252,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.026260429225946468,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "3a466b09d4a55de81c8cd2996f4728ce",
"classification": {
"BBH": 0.0566006238677575,
"BNS": 1.569624430601763e-15,
"NSBH": 1.1298725906561106e-13,
"Terrestrial": 0.943399376132128
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-06T22:11:08Z",
"superevent_id": "S250306fg",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T22:11:09.458374Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T22:11:09.458400Z",
"modified": "2025-03-06T22:11:09.477381Z"
}
},
{
"id": 8293,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185742,
"topic": "igwn.gwalert",
"uuid": "d6e756ad-2799-40a2-91bd-9ddc671f873e",
"title": "S250306fg - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250306fg/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250306fg/view/"
},
"event": {
"far": 2.200903976562751e-05,
"time": "2025-03-06T22:10:44.509Z",
"group": "CBC",
"search": "AllSky",
"area_50": 741.7257589553689,
"area_90": 2580.8279590243383,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.026260429225946468,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "af23aa2163047db172d034b06d9c842d",
"classification": {
"BBH": 0.048127451836092065,
"BNS": 1.0491939755758798e-15,
"NSBH": 7.55717886107111e-14,
"Terrestrial": 0.9518725481638313
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-06T22:15:46Z",
"superevent_id": "S250306fg",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-06T22:15:47.311855Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-06T22:15:47.311878Z",
"modified": "2025-03-06T22:15:47.322235Z"
}
}
],
"references": []
},
{
"event_id": "S250307i",
"sequences": [
{
"id": 8294,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185743,
"topic": "igwn.gwalert",
"uuid": "70e5564e-8572-489e-959d-e2bbb3db8b7a",
"title": "S250307i - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307i/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307i/view/"
},
"event": {
"far": 1.830849e-05,
"time": "2025-03-07T00:22:53.793Z",
"group": "CBC",
"search": "AllSky",
"area_50": 712.9799516068864,
"area_90": 2224.1281598095925,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.3454435588715439,
"HasRemnant": 0.2255397284268298
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "bed35ea0e33c10079c05d347471bbbc6",
"classification": {
"BBH": 0.0,
"BNS": 0.000491926,
"NSBH": 0.000341847,
"Terrestrial": 0.999166227
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-07T00:23:24Z",
"superevent_id": "S250307i",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T00:23:25.569670Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T00:23:25.569694Z",
"modified": "2025-03-07T00:23:25.591138Z"
}
},
{
"id": 8295,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185744,
"topic": "igwn.gwalert",
"uuid": "93621c8f-690c-43f5-bddb-4839e13f9665",
"title": "S250307i - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307i/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307i/view/"
},
"event": {
"far": 1.830849e-05,
"time": "2025-03-07T00:22:53.793Z",
"group": "CBC",
"search": "AllSky",
"area_50": 712.9799516068864,
"area_90": 2224.1281598095925,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.3454435588715439,
"HasRemnant": 0.2255397284268298
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "bed35ea0e33c10079c05d347471bbbc6",
"classification": {
"BBH": 0.0,
"BNS": 0.000491926,
"NSBH": 0.000341847,
"Terrestrial": 0.999166227
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-07T00:27:59Z",
"superevent_id": "S250307i",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T00:28:01.276673Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T00:28:01.276693Z",
"modified": "2025-03-07T00:28:01.289455Z"
}
}
],
"references": []
},
{
"event_id": "S250307an",
"sequences": [
{
"id": 8296,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185745,
"topic": "igwn.gwalert",
"uuid": "8dda83a2-94f3-4473-a804-2822c9a3347d",
"title": "S250307an - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307an/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307an/view/"
},
"event": {
"far": 5.79215e-06,
"time": "2025-03-07T04:10:52.303Z",
"group": "Burst",
"search": "AllSky",
"area_50": 146.03709426674308,
"area_90": 605.1307181972514,
"duration": 0.001677,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f41b94b64f95f71db5ad57874014cc62",
"classification": {},
"skymap_version": 0,
"central_frequency": 639.054443
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-07T04:13:32Z",
"superevent_id": "S250307an",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T04:13:33.359404Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T04:13:33.359427Z",
"modified": "2025-03-07T04:13:33.377556Z"
}
},
{
"id": 8297,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185746,
"topic": "igwn.gwalert",
"uuid": "bf8f286b-32dc-4ba5-a4c0-541284100933",
"title": "S250307an - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307an/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307an/view/"
},
"event": {
"far": 5.79215e-06,
"time": "2025-03-07T04:10:52.303Z",
"group": "Burst",
"search": "AllSky",
"area_50": 146.03709426674308,
"area_90": 605.1307181972514,
"duration": 0.001677,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f41b94b64f95f71db5ad57874014cc62",
"classification": {},
"skymap_version": 0,
"central_frequency": 639.054443
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-07T04:18:07Z",
"superevent_id": "S250307an",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T04:18:08.094074Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T04:18:08.094091Z",
"modified": "2025-03-07T04:18:08.104496Z"
}
}
],
"references": []
},
{
"event_id": "S250307ba",
"sequences": [
{
"id": 8298,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185747,
"topic": "igwn.gwalert",
"uuid": "ad144b0e-a316-4a36-ac49-6149a6fd1e4f",
"title": "S250307ba - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307ba/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307ba/view/"
},
"event": {
"far": 1.88738114533636e-05,
"time": "2025-03-07T04:58:21.712Z",
"group": "CBC",
"search": "AllSky",
"area_50": 517.8441790952901,
"area_90": 2701.686243934746,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "f4f3f1f499dfc58eef0519a2774bb513",
"classification": {
"BBH": 0.05841237872508926,
"BNS": 1.2016634805303235e-16,
"NSBH": 7.922780596527643e-15,
"Terrestrial": 0.9415876212749027
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-07T04:58:49Z",
"superevent_id": "S250307ba",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T04:58:50.149879Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T04:58:50.149896Z",
"modified": "2025-03-07T04:58:50.166472Z"
}
},
{
"id": 8299,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185748,
"topic": "igwn.gwalert",
"uuid": "b1f68218-8528-4917-af92-d28a4fbaa916",
"title": "S250307ba - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307ba/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250307ba/view/"
},
"event": {
"far": 1.88738114533636e-05,
"time": "2025-03-07T04:58:21.717Z",
"group": "CBC",
"search": "AllSky",
"area_50": 549.7373376133145,
"area_90": 2908.1524806566936,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6094667bbdf295a45f410dc65d983367",
"classification": {
"BBH": 0.05841237872508926,
"BNS": 1.2016634805303235e-16,
"NSBH": 7.922780596527643e-15,
"Terrestrial": 0.9415876212749027
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-07T05:03:25Z",
"superevent_id": "S250307ba",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T05:03:27.016983Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T05:03:27.017002Z",
"modified": "2025-03-07T05:03:27.034026Z"
}
}
],
"references": []
},
{
"event_id": "S250307bn",
"sequences": [
{
"id": 8300,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185749,
"topic": "igwn.gwalert",
"uuid": "07b22584-69f4-4a70-b1f7-968967413e81",
"title": "S250307bn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307bn/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307bn/view/"
},
"event": {
"far": 1.655364758335054e-05,
"time": "2025-03-07T05:30:57.409Z",
"group": "CBC",
"search": "AllSky",
"area_50": 12446.724758481605,
"area_90": 32507.52146631892,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.000689655172413793,
"HasRemnant": 0.0
},
"instruments": [
"L1",
"V1"
],
"significant": false,
"skymap_hash": "b6413a2718fdc86e20270b2d5569932b",
"classification": {
"BBH": 0.043400247394582744,
"BNS": 0.0,
"NSBH": 0.0037426344245740043,
"Terrestrial": 0.9528571181808433
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-07T05:31:21Z",
"superevent_id": "S250307bn",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T05:31:22.593670Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T05:31:22.593689Z",
"modified": "2025-03-07T05:31:22.606485Z"
}
},
{
"id": 8301,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185750,
"topic": "igwn.gwalert",
"uuid": "4d55b878-57c4-4aca-a68a-8daf356b71b9",
"title": "S250307bn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307bn/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307bn/view/"
},
"event": {
"far": 1.655364758335054e-05,
"time": "2025-03-07T05:30:57.409Z",
"group": "CBC",
"search": "AllSky",
"area_50": 12446.724758481605,
"area_90": 32507.52146631892,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.000689655172413793,
"HasRemnant": 0.0
},
"instruments": [
"L1",
"V1"
],
"significant": false,
"skymap_hash": "b6413a2718fdc86e20270b2d5569932b",
"classification": {
"BBH": 0.043400247394582744,
"BNS": 0.0,
"NSBH": 0.0037426344245740043,
"Terrestrial": 0.9528571181808433
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-07T05:35:57Z",
"superevent_id": "S250307bn",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T05:35:58.323024Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T05:35:58.323042Z",
"modified": "2025-03-07T05:35:58.333998Z"
}
}
],
"references": []
},
{
"event_id": "S250307dc",
"sequences": [
{
"id": 8302,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185751,
"topic": "igwn.gwalert",
"uuid": "11d1961a-6b40-40c4-86bc-9ce30ea949c7",
"title": "S250307dc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307dc/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307dc/view/"
},
"event": {
"far": 6.13962e-07,
"time": "2025-03-07T09:52:59.673Z",
"group": "CBC",
"search": "AllSky",
"area_50": 222.15053671683077,
"area_90": 1231.6634243473873,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "62ad31b8e58a2e15c24810e5844f6ae1",
"classification": {
"BBH": 0.0,
"BNS": 0.020120218,
"NSBH": 0.0,
"Terrestrial": 0.979879782
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-07T09:53:30Z",
"superevent_id": "S250307dc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T09:53:31.513468Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T09:53:31.513485Z",
"modified": "2025-03-07T09:53:31.525298Z"
}
},
{
"id": 8303,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185752,
"topic": "igwn.gwalert",
"uuid": "91cc6eca-0019-4b7b-b57f-bb499f2647ec",
"title": "S250307dc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307dc/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250307dc/view/"
},
"event": {
"far": 1.807940140377523e-05,
"time": "2025-03-07T09:52:59.680Z",
"group": "CBC",
"search": "AllSky",
"area_50": 267.787128675188,
"area_90": 1224.9490751856981,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "7d2f6ca204baa8dbaff587c275475e16",
"classification": {
"BBH": 0.0,
"BNS": 0.0018753383926680262,
"NSBH": 6.678687958698707e-05,
"Terrestrial": 0.998057874727745
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-07T09:58:06Z",
"superevent_id": "S250307dc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T09:58:07.154038Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T09:58:07.154056Z",
"modified": "2025-03-07T09:58:07.164003Z"
}
}
],
"references": []
},
{
"event_id": "S250307eu",
"sequences": [
{
"id": 8304,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185753,
"topic": "igwn.gwalert",
"uuid": "4d4b162d-8644-498a-8e9c-39c53e016679",
"title": "S250307eu - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307eu/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307eu/view/"
},
"event": {
"far": 8.492662e-06,
"time": "2025-03-07T12:26:57.800Z",
"group": "CBC",
"search": "AllSky",
"area_50": 314.158102573105,
"area_90": 1160.1136410931356,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.7416809454999179,
"HasMassGap": 0.05528467108375296,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "78765ecb5cd8c0ba1ff2f49c12f772da",
"classification": {
"BBH": 0.023726122,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.976273878
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-07T12:27:29Z",
"superevent_id": "S250307eu",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T12:27:30.395718Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T12:27:30.395745Z",
"modified": "2025-03-07T12:27:30.408878Z"
}
},
{
"id": 8305,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185754,
"topic": "igwn.gwalert",
"uuid": "bed83d92-5256-4b04-aba5-48a1277c78ca",
"title": "S250307eu - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307eu/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307eu/view/"
},
"event": {
"far": 8.492662e-06,
"time": "2025-03-07T12:26:57.800Z",
"group": "CBC",
"search": "AllSky",
"area_50": 314.158102573105,
"area_90": 1160.1136410931356,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.7416809454999179,
"HasMassGap": 0.05528467108375296,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "78765ecb5cd8c0ba1ff2f49c12f772da",
"classification": {
"BBH": 0.023726122,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.976273878
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-07T12:32:04Z",
"superevent_id": "S250307eu",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T12:32:04.998491Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T12:32:04.998507Z",
"modified": "2025-03-07T12:32:05.017073Z"
}
}
],
"references": []
},
{
"event_id": "S250307fh",
"sequences": [
{
"id": 8306,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185755,
"topic": "igwn.gwalert",
"uuid": "b4a905e3-68f7-4a5a-b7f2-f72d631db17f",
"title": "S250307fh - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307fh/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307fh/view/"
},
"event": {
"far": 1.722619344945997e-06,
"time": "2025-03-07T13:33:49.648Z",
"group": "CBC",
"search": "AllSky",
"area_50": 694.3056680009378,
"area_90": 15654.505070478685,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "05ffa6d6cb701b78da0517f7f1083ad7",
"classification": {
"BBH": 0.0,
"BNS": 0.01844486440816849,
"NSBH": 0.0,
"Terrestrial": 0.9815551355918315
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-07T13:34:16Z",
"superevent_id": "S250307fh",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T13:34:17.554689Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T13:34:17.554708Z",
"modified": "2025-03-07T13:34:17.569640Z"
}
},
{
"id": 8307,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185756,
"topic": "igwn.gwalert",
"uuid": "37f45b56-3264-4d59-a80b-f2e05ab6d01c",
"title": "S250307fh - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307fh/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307fh/view/"
},
"event": {
"far": 1.722619344945997e-06,
"time": "2025-03-07T13:33:49.648Z",
"group": "CBC",
"search": "AllSky",
"area_50": 694.3056680009378,
"area_90": 15654.505070478685,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "05ffa6d6cb701b78da0517f7f1083ad7",
"classification": {
"BBH": 0.0,
"BNS": 0.01844486440816849,
"NSBH": 0.0,
"Terrestrial": 0.9815551355918315
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-07T13:38:52Z",
"superevent_id": "S250307fh",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T13:38:53.215924Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T13:38:53.215942Z",
"modified": "2025-03-07T13:38:53.227362Z"
}
}
],
"references": []
},
{
"event_id": "S250307fm",
"sequences": [
{
"id": 8308,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185757,
"topic": "igwn.gwalert",
"uuid": "36ed7c93-755f-41d9-96f0-503a7e9ac003",
"title": "S250307fm - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307fm/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307fm/view/"
},
"event": {
"far": 9.058e-06,
"time": "2025-03-07T13:52:05.398Z",
"group": "CBC",
"search": "BBH",
"area_50": 732.7033522693488,
"area_90": 2450.7374440166072,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "0cf814ce011111dcc4e7090b87bfe671",
"classification": {
"BBH": 0.004668480946119269,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9953315190538807
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-07T13:53:15Z",
"superevent_id": "S250307fm",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T13:53:17.114581Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T13:53:17.114599Z",
"modified": "2025-03-07T13:53:17.124131Z"
}
},
{
"id": 8309,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185758,
"topic": "igwn.gwalert",
"uuid": "7cb46477-0143-4771-a68d-03c0845ca7ed",
"title": "S250307fm - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307fm/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307fm/view/"
},
"event": {
"far": 9.058e-06,
"time": "2025-03-07T13:52:05.398Z",
"group": "CBC",
"search": "BBH",
"area_50": 732.7033522693488,
"area_90": 2450.7374440166072,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "0cf814ce011111dcc4e7090b87bfe671",
"classification": {
"BBH": 0.004668480946119269,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9953315190538807
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-07T13:57:50Z",
"superevent_id": "S250307fm",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T13:57:51.753676Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T13:57:51.753693Z",
"modified": "2025-03-07T13:57:51.764735Z"
}
}
],
"references": []
},
{
"event_id": "S250307gc",
"sequences": [
{
"id": 8310,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185759,
"topic": "igwn.gwalert",
"uuid": "dd4894aa-151c-4884-ac7f-a65527aee1ba",
"title": "S250307gc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307gc/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307gc/view/"
},
"event": {
"far": 1.435448829693568e-05,
"time": "2025-03-07T17:09:12.727Z",
"group": "CBC",
"search": "AllSky",
"area_50": 548.058750322892,
"area_90": 2348.343619300845,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "337c47cbeeccfb36e2a0a97751679555",
"classification": {
"BBH": 0.07731968590953944,
"BNS": 2.565470960190586e-15,
"NSBH": 1.774270713732808e-13,
"Terrestrial": 0.9226803140902806
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-07T17:09:38Z",
"superevent_id": "S250307gc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T17:09:39.014510Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T17:09:39.014529Z",
"modified": "2025-03-07T17:09:39.037449Z"
}
},
{
"id": 8311,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185760,
"topic": "igwn.gwalert",
"uuid": "5c0d5a94-4ed0-40ab-847c-db83aa8b1232",
"title": "S250307gc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250307gc/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250307gc/view/"
},
"event": {
"far": 1.435448829693568e-05,
"time": "2025-03-07T17:09:12.727Z",
"group": "CBC",
"search": "AllSky",
"area_50": 548.058750322892,
"area_90": 2348.343619300845,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "337c47cbeeccfb36e2a0a97751679555",
"classification": {
"BBH": 0.07731968590953944,
"BNS": 2.565470960190586e-15,
"NSBH": 1.774270713732808e-13,
"Terrestrial": 0.9226803140902806
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-07T17:14:13Z",
"superevent_id": "S250307gc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T17:14:13.656654Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T17:14:13.656676Z",
"modified": "2025-03-07T17:14:13.667457Z"
}
}
],
"references": []
},
{
"event_id": "S250307hy",
"sequences": [
{
"id": 8312,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185761,
"topic": "igwn.gwalert",
"uuid": "31d99be5-0d26-40df-ac1a-2bc510249e18",
"title": "S250307hy - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250307hy/view/"
},
"event": {
"far": 1.528181573717162e-05,
"time": "2025-03-07T21:34:25.577Z",
"group": "Burst",
"search": "AllSky",
"area_50": 6443.257314286129,
"area_90": 21997.047147339475,
"duration": 0.21875,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "09affec8124b7d63650856568ba44ad8",
"classification": {},
"skymap_version": 0,
"central_frequency": 144.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-07T21:35:05Z",
"superevent_id": "S250307hy",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T21:35:06.455650Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T21:35:06.455668Z",
"modified": "2025-03-07T21:35:06.474254Z"
}
},
{
"id": 8313,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185762,
"topic": "igwn.gwalert",
"uuid": "828992eb-0ca9-4042-b137-e7b332e138c4",
"title": "S250307hy - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250307hy/view/"
},
"event": {
"far": 1.528181573717162e-05,
"time": "2025-03-07T21:34:25.577Z",
"group": "Burst",
"search": "AllSky",
"area_50": 6443.257314286129,
"area_90": 21997.047147339475,
"duration": 0.21875,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "09affec8124b7d63650856568ba44ad8",
"classification": {},
"skymap_version": 0,
"central_frequency": 144.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-07T21:39:39Z",
"superevent_id": "S250307hy",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-07T21:39:41.132972Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-07T21:39:41.132990Z",
"modified": "2025-03-07T21:39:41.146840Z"
}
}
],
"references": []
},
{
"event_id": "S250308t",
"sequences": [
{
"id": 8314,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185763,
"topic": "igwn.gwalert",
"uuid": "a3fe03b6-d8aa-4a51-8f36-1f33ba18926d",
"title": "S250308t - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308t/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308t/view/"
},
"event": {
"far": 1.6757e-05,
"time": "2025-03-08T03:40:39.455Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1188.859448441618,
"area_90": 3796.964450935319,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0926066792721965,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "9d01d7d121ac1cf61e44707ed2f5f959",
"classification": {
"BBH": 0.041980888,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.958019112
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T03:41:09Z",
"superevent_id": "S250308t",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T03:41:10.501329Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T03:41:10.501345Z",
"modified": "2025-03-08T03:41:10.529365Z"
}
},
{
"id": 8315,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185764,
"topic": "igwn.gwalert",
"uuid": "6ed28eff-3e97-4813-be6d-3b8c937a0034",
"title": "S250308t - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308t/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308t/view/"
},
"event": {
"far": 1.6757e-05,
"time": "2025-03-08T03:40:39.455Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1188.859448441618,
"area_90": 3796.964450935319,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0926066792721965,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "9d01d7d121ac1cf61e44707ed2f5f959",
"classification": {
"BBH": 0.041980888,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.958019112
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T03:45:47Z",
"superevent_id": "S250308t",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T03:45:48.195807Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T03:45:48.195826Z",
"modified": "2025-03-08T03:45:48.208648Z"
}
}
],
"references": []
},
{
"event_id": "S250308bc",
"sequences": [
{
"id": 8316,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185765,
"topic": "igwn.gwalert",
"uuid": "0154ad04-1d77-469c-9c41-3a8198a7a77b",
"title": "S250308bc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250308bc/view/"
},
"event": {
"far": 1.8919662964699513e-07,
"time": "2025-03-08T05:19:33.421Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7193.585833104913,
"area_90": 23473.364669265917,
"duration": 0.28125,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "c7f169b5ad886380d1038882999cf2ee",
"classification": {},
"skymap_version": 0,
"central_frequency": 72.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T05:20:13Z",
"superevent_id": "S250308bc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T05:20:13.643872Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T05:20:13.643887Z",
"modified": "2025-03-08T05:20:13.657999Z"
}
},
{
"id": 8317,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185766,
"topic": "igwn.gwalert",
"uuid": "4cfcf613-e254-463d-a5aa-6d5ba9c9c0ff",
"title": "S250308bc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250308bc/view/"
},
"event": {
"far": 1.8919662964699513e-07,
"time": "2025-03-08T05:19:33.421Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7193.585833104913,
"area_90": 23473.364669265917,
"duration": 0.28125,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "c7f169b5ad886380d1038882999cf2ee",
"classification": {},
"skymap_version": 0,
"central_frequency": 72.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T05:24:47Z",
"superevent_id": "S250308bc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T05:24:48.317526Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T05:24:48.317542Z",
"modified": "2025-03-08T05:24:48.330643Z"
}
}
],
"references": []
},
{
"event_id": "S250308cb",
"sequences": [
{
"id": 8318,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185767,
"topic": "igwn.gwalert",
"uuid": "81b31291-2531-424c-89c7-176110126a9c",
"title": "S250308cb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250308cb/view/"
},
"event": {
"far": 1.0902144273383789e-05,
"time": "2025-03-08T06:36:12.628Z",
"group": "Burst",
"search": "AllSky",
"area_50": 6941.797739541562,
"area_90": 22617.28515115053,
"duration": 0.15625,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "c55c610bf990051e0f86716258702a3f",
"classification": {},
"skymap_version": 0,
"central_frequency": 240.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T06:36:52Z",
"superevent_id": "S250308cb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T06:36:53.145950Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T06:36:53.145968Z",
"modified": "2025-03-08T06:36:53.162183Z"
}
},
{
"id": 8319,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185768,
"topic": "igwn.gwalert",
"uuid": "02aa24e6-1f6d-4a59-a6e0-71950260e72b",
"title": "S250308cb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250308cb/view/"
},
"event": {
"far": 1.0902144273383789e-05,
"time": "2025-03-08T06:36:12.628Z",
"group": "Burst",
"search": "AllSky",
"area_50": 6941.797739541562,
"area_90": 22617.28515115053,
"duration": 0.15625,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "c55c610bf990051e0f86716258702a3f",
"classification": {},
"skymap_version": 0,
"central_frequency": 240.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T06:41:27Z",
"superevent_id": "S250308cb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T06:41:27.775772Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T06:41:27.775790Z",
"modified": "2025-03-08T06:41:27.786032Z"
}
}
],
"references": []
},
{
"event_id": "S250308dn",
"sequences": [
{
"id": 8320,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185769,
"topic": "igwn.gwalert",
"uuid": "d1ed41c6-2f01-4a37-9888-7f84995ef72a",
"title": "S250308dn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250308dn/view/"
},
"event": {
"far": 2.148861180232826e-05,
"time": "2025-03-08T10:30:30.643Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7386.6233715034805,
"area_90": 22796.89399122572,
"duration": 0.1875,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "586cc08d5f4681db1eda8ef331219518",
"classification": {},
"skymap_version": 0,
"central_frequency": 80.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T10:31:08Z",
"superevent_id": "S250308dn",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T10:31:09.855501Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T10:31:09.855520Z",
"modified": "2025-03-08T10:31:09.868278Z"
}
},
{
"id": 8321,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185770,
"topic": "igwn.gwalert",
"uuid": "2ecc6af8-c107-4d26-9e4c-25987979cb00",
"title": "S250308dn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250308dn/view/"
},
"event": {
"far": 2.148861180232826e-05,
"time": "2025-03-08T10:30:30.643Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7386.6233715034805,
"area_90": 22796.89399122572,
"duration": 0.1875,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "586cc08d5f4681db1eda8ef331219518",
"classification": {},
"skymap_version": 0,
"central_frequency": 80.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T10:35:47Z",
"superevent_id": "S250308dn",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T10:35:48.582809Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T10:35:48.582832Z",
"modified": "2025-03-08T10:35:48.592287Z"
}
}
],
"references": []
},
{
"event_id": "S250308dw",
"sequences": [
{
"id": 8322,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185771,
"topic": "igwn.gwalert",
"uuid": "9cd3c1b9-a83c-440c-a589-8568c9d6d43b",
"title": "S250308dw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308dw/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308dw/view/"
},
"event": {
"far": 9.196133e-06,
"time": "2025-03-08T10:58:37.724Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1072.197631757266,
"area_90": 5194.388370211913,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.28688645667584295,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "2bee9b0276140f4d11a9e5fd9c8604e9",
"classification": {
"BBH": 0.08584638,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.91415362
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T10:59:09Z",
"superevent_id": "S250308dw",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T10:59:09.403145Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T10:59:09.403162Z",
"modified": "2025-03-08T10:59:09.413281Z"
}
},
{
"id": 8323,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185772,
"topic": "igwn.gwalert",
"uuid": "6034296c-65b1-4052-947a-15ec7f15e594",
"title": "S250308dw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308dw/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308dw/view/"
},
"event": {
"far": 9.196133e-06,
"time": "2025-03-08T10:58:37.724Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1072.197631757266,
"area_90": 5194.388370211913,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.28688645667584295,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "2bee9b0276140f4d11a9e5fd9c8604e9",
"classification": {
"BBH": 0.08584638,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.91415362
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T11:03:47Z",
"superevent_id": "S250308dw",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T11:03:48.040736Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T11:03:48.040758Z",
"modified": "2025-03-08T11:03:48.053052Z"
}
}
],
"references": []
},
{
"event_id": "S250308em",
"sequences": [
{
"id": 8324,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185773,
"topic": "igwn.gwalert",
"uuid": "edfb1892-33ea-45c8-9009-b5f034e29b39",
"title": "S250308em - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308em/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308em/view/"
},
"event": {
"far": 7.911654e-06,
"time": "2025-03-08T11:45:02.418Z",
"group": "CBC",
"search": "AllSky",
"area_50": 284.46808987375994,
"area_90": 1071.3583381120545,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.6130865470629786,
"HasRemnant": 0.0052297039651397915
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "69e81632b042316acb10a747eb368718",
"classification": {
"BBH": 0.0,
"BNS": 0.001586872,
"NSBH": 0.000246847,
"Terrestrial": 0.998166282
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T11:45:34Z",
"superevent_id": "S250308em",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T11:45:35.353168Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T11:45:35.353190Z",
"modified": "2025-03-08T11:45:35.369326Z"
}
},
{
"id": 8325,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185774,
"topic": "igwn.gwalert",
"uuid": "387f341c-983b-4edd-95e3-320a9eba9dcb",
"title": "S250308em - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308em/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308em/view/"
},
"event": {
"far": 7.911654e-06,
"time": "2025-03-08T11:45:02.418Z",
"group": "CBC",
"search": "AllSky",
"area_50": 284.46808987375994,
"area_90": 1071.3583381120545,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.6130865470629786,
"HasRemnant": 0.0052297039651397915
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "69e81632b042316acb10a747eb368718",
"classification": {
"BBH": 0.0,
"BNS": 0.001586872,
"NSBH": 0.000246847,
"Terrestrial": 0.998166282
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T11:50:10Z",
"superevent_id": "S250308em",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T11:50:11.036347Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T11:50:11.036364Z",
"modified": "2025-03-08T11:50:11.045723Z"
}
}
],
"references": []
},
{
"event_id": "S250308fe",
"sequences": [
{
"id": 8326,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185775,
"topic": "igwn.gwalert",
"uuid": "2b7728be-94e1-476a-98de-36331683f8ea",
"title": "S250308fe - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308fe/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308fe/view/"
},
"event": {
"far": 2.03847412677603e-05,
"time": "2025-03-08T13:01:21.060Z",
"group": "CBC",
"search": "AllSky",
"area_50": 348.51668617393705,
"area_90": 1917.7859793075163,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.9151738319102042,
"HasMassGap": 0.5343976925262534,
"HasRemnant": 0.11186012886371036
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "752e6d86b0765416119090f798a2eac4",
"classification": {
"BBH": 0.00032604710611212586,
"BNS": 0.0,
"NSBH": 0.0017222406663567505,
"Terrestrial": 0.9979517122275311
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T13:01:44Z",
"superevent_id": "S250308fe",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T13:01:45.369493Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T13:01:45.369510Z",
"modified": "2025-03-08T13:01:45.385284Z"
}
},
{
"id": 8327,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185776,
"topic": "igwn.gwalert",
"uuid": "5e0d3ef5-0102-4878-b06c-bda82880db69",
"title": "S250308fe - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308fe/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250308fe/view/"
},
"event": {
"far": 2.03847412677603e-05,
"time": "2025-03-08T13:01:21.058Z",
"group": "CBC",
"search": "AllSky",
"area_50": 775.5073281751182,
"area_90": 3744.9282449322272,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.697603916003194,
"HasMassGap": 0.5053504130625305,
"HasRemnant": 0.4334558892992318
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6701e502612192bd0dc2d1c2a9386f0a",
"classification": {
"BBH": 0.00031637078724177395,
"BNS": 0.0,
"NSBH": 0.0017319169852271304,
"Terrestrial": 0.9979517122275311
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T13:06:19Z",
"superevent_id": "S250308fe",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T13:06:19.987569Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T13:06:19.987586Z",
"modified": "2025-03-08T13:06:19.997720Z"
}
}
],
"references": []
},
{
"event_id": "S250308fi",
"sequences": [
{
"id": 8328,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185777,
"topic": "igwn.gwalert",
"uuid": "68154b26-e09f-47f6-af94-9b44fe506a24",
"title": "S250308fi - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308fi/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308fi/view/"
},
"event": {
"far": 1.70821e-05,
"time": "2025-03-08T13:23:32.176Z",
"group": "CBC",
"search": "BBH",
"area_50": 522.0406473213458,
"area_90": 1518.282204187001,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "3fb7b3728020ee96fb72e48563f76e82",
"classification": {
"BBH": 0.0017366350672369801,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.998263364932763
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T13:24:33Z",
"superevent_id": "S250308fi",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T13:24:34.300891Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T13:24:34.300909Z",
"modified": "2025-03-08T13:24:34.319983Z"
}
},
{
"id": 8329,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185778,
"topic": "igwn.gwalert",
"uuid": "299603a0-939d-4fa8-806e-b60fb007b46d",
"title": "S250308fi - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308fi/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308fi/view/"
},
"event": {
"far": 1.70821e-05,
"time": "2025-03-08T13:23:32.176Z",
"group": "CBC",
"search": "BBH",
"area_50": 522.0406473213458,
"area_90": 1518.282204187001,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "3fb7b3728020ee96fb72e48563f76e82",
"classification": {
"BBH": 0.0017366350672369801,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.998263364932763
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T13:29:07Z",
"superevent_id": "S250308fi",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T13:29:08.014299Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T13:29:08.014317Z",
"modified": "2025-03-08T13:29:08.026380Z"
}
}
],
"references": []
},
{
"event_id": "S250308gy",
"sequences": [
{
"id": 8330,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185779,
"topic": "igwn.gwalert",
"uuid": "32c687c7-1ce0-4957-9f32-184819fb8105",
"title": "S250308gy - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308gy/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308gy/view/"
},
"event": {
"far": 1.183693889605737e-05,
"time": "2025-03-08T17:17:26.249Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1404.767738672191,
"area_90": 5251.460338086273,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.012106583072100312,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "c833c781a4a0b45220229997469a5bb1",
"classification": {
"BBH": 0.09507679399354761,
"BNS": 1.4398444271159744e-14,
"NSBH": 9.912315922489193e-13,
"Terrestrial": 0.9049232060054467
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T17:17:49Z",
"superevent_id": "S250308gy",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T17:17:50.163351Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T17:17:50.163366Z",
"modified": "2025-03-08T17:17:50.173322Z"
}
},
{
"id": 8331,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185780,
"topic": "igwn.gwalert",
"uuid": "9c6de257-6090-463f-bb87-cf2c10759a13",
"title": "S250308gy - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308gy/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250308gy/view/"
},
"event": {
"far": 1.183693889605737e-05,
"time": "2025-03-08T17:17:26.238Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1251.38682500985,
"area_90": 4773.902253961118,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "28cf6834296c5556e12b9490e9b051a3",
"classification": {
"BBH": 0.09507679399354761,
"BNS": 1.4398444271159744e-14,
"NSBH": 9.912315922489193e-13,
"Terrestrial": 0.9049232060054467
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T17:22:24Z",
"superevent_id": "S250308gy",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T17:22:24.820612Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T17:22:24.820630Z",
"modified": "2025-03-08T17:22:24.829712Z"
}
}
],
"references": []
},
{
"event_id": "S250308hz",
"sequences": [
{
"id": 8332,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185781,
"topic": "igwn.gwalert",
"uuid": "23fd6b25-bf66-47c9-bef9-bb350dd1c336",
"title": "S250308hz - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308hz/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308hz/view/"
},
"event": {
"far": 1.534079e-05,
"time": "2025-03-08T18:33:56.682Z",
"group": "CBC",
"search": "AllSky",
"area_50": 365.40747078381185,
"area_90": 1433.0938991980674,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.20483342972816657,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "7659345a870b0f2e4359f3eb5e348776",
"classification": {
"BBH": 0.0,
"BNS": 0.000911262,
"NSBH": 7.2901e-05,
"Terrestrial": 0.999015837
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T18:34:24Z",
"superevent_id": "S250308hz",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T18:34:25.877371Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T18:34:25.877389Z",
"modified": "2025-03-08T18:34:25.885446Z"
}
},
{
"id": 8333,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185782,
"topic": "igwn.gwalert",
"uuid": "d0bac01f-19c8-44e7-b37a-b914499b0f4e",
"title": "S250308hz - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308hz/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308hz/view/"
},
"event": {
"far": 1.534079e-05,
"time": "2025-03-08T18:33:56.682Z",
"group": "CBC",
"search": "AllSky",
"area_50": 365.40747078381185,
"area_90": 1433.0938991980674,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.20483342972816657,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "7659345a870b0f2e4359f3eb5e348776",
"classification": {
"BBH": 0.0,
"BNS": 0.000911262,
"NSBH": 7.2901e-05,
"Terrestrial": 0.999015837
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T18:38:59Z",
"superevent_id": "S250308hz",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T18:39:00.508055Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T18:39:00.508072Z",
"modified": "2025-03-08T18:39:00.541606Z"
}
}
],
"references": []
},
{
"event_id": "S250308id",
"sequences": [
{
"id": 8334,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185783,
"topic": "igwn.gwalert",
"uuid": "c139a2c0-ad26-4c48-8918-09be166f041b",
"title": "S250308id - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308id/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308id/view/"
},
"event": {
"far": 9.151222685043591e-06,
"time": "2025-03-08T18:41:36.399Z",
"group": "CBC",
"search": "AllSky",
"area_50": 676.4706780402005,
"area_90": 2363.4509049146463,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.007345713506882921,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "637fe7e94818e0804350291c62bae089",
"classification": {
"BBH": 0.1289255316902247,
"BNS": 3.185938465463687e-16,
"NSBH": 2.0997235047040992e-14,
"Terrestrial": 0.871074468309754
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T18:41:59Z",
"superevent_id": "S250308id",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T18:42:00.101660Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T18:42:00.101677Z",
"modified": "2025-03-08T18:42:00.139809Z"
}
},
{
"id": 8335,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185784,
"topic": "igwn.gwalert",
"uuid": "436e22ca-e0c2-467b-b2a1-4b9902db4714",
"title": "S250308id - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308id/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250308id/view/"
},
"event": {
"far": 9.151222685043591e-06,
"time": "2025-03-08T18:41:36.399Z",
"group": "CBC",
"search": "AllSky",
"area_50": 664.0910967733358,
"area_90": 2460.808967759141,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "7926526683a99852ce0eb6086669c3d0",
"classification": {
"BBH": 0.1289255316902247,
"BNS": 3.185938465463687e-16,
"NSBH": 2.0997235047040992e-14,
"Terrestrial": 0.871074468309754
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T18:46:34Z",
"superevent_id": "S250308id",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T18:46:34.775585Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T18:46:34.775605Z",
"modified": "2025-03-08T18:46:34.784218Z"
}
}
],
"references": []
},
{
"event_id": "S250308iq",
"sequences": [
{
"id": 8336,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185785,
"topic": "igwn.gwalert",
"uuid": "1f7dcd56-6324-4cb9-931b-8c7d48851547",
"title": "S250308iq - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308iq/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308iq/view/"
},
"event": {
"far": 1.336634159088135e-05,
"time": "2025-03-08T19:16:29.933Z",
"group": "CBC",
"search": "AllSky",
"area_50": 48.049561188339304,
"area_90": 227.23875444092346,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "022341fb81f73ec2c53b53ffcea47b8b",
"classification": {
"BBH": 0.0,
"BNS": 0.001195231035514126,
"NSBH": 0.0,
"Terrestrial": 0.9988047689644859
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T19:16:59Z",
"superevent_id": "S250308iq",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T19:17:00.807484Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T19:17:00.807502Z",
"modified": "2025-03-08T19:17:00.822220Z"
}
},
{
"id": 8337,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185786,
"topic": "igwn.gwalert",
"uuid": "880fe54b-50f7-4fc7-a810-7182c1627209",
"title": "S250308iq - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308iq/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308iq/view/"
},
"event": {
"far": 1.336634159088135e-05,
"time": "2025-03-08T19:16:29.933Z",
"group": "CBC",
"search": "AllSky",
"area_50": 48.049561188339304,
"area_90": 227.23875444092346,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.0,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "022341fb81f73ec2c53b53ffcea47b8b",
"classification": {
"BBH": 0.0,
"BNS": 0.001195231035514126,
"NSBH": 0.0,
"Terrestrial": 0.9988047689644859
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T19:21:36Z",
"superevent_id": "S250308iq",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T19:21:37.477691Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T19:21:37.477707Z",
"modified": "2025-03-08T19:21:37.487521Z"
}
}
],
"references": []
},
{
"event_id": "S250308ja",
"sequences": [
{
"id": 8338,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185787,
"topic": "igwn.gwalert",
"uuid": "19796f3a-8d72-4b29-80b1-89c8345fd2d7",
"title": "S250308ja - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308ja/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308ja/view/"
},
"event": {
"far": 1.152916563492518e-06,
"time": "2025-03-08T21:32:06.061Z",
"group": "CBC",
"search": "AllSky",
"area_50": 779.9136198124769,
"area_90": 2676.5074345784114,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.059442968908486146,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "25627948621ab130962cc30cc9e95143",
"classification": {
"BBH": 0.5936828544843631,
"BNS": 1.7921973828494038e-17,
"NSBH": 1.2874529472155797e-15,
"Terrestrial": 0.4063171455156356
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T21:32:35Z",
"superevent_id": "S250308ja",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T21:32:36.592292Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T21:32:36.592309Z",
"modified": "2025-03-08T21:32:36.611520Z"
}
},
{
"id": 8339,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185788,
"topic": "igwn.gwalert",
"uuid": "f6429051-c99a-444d-851f-3ab05615fca3",
"title": "S250308ja - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308ja/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308ja/view/"
},
"event": {
"far": 1.152916563492518e-06,
"time": "2025-03-08T21:32:06.061Z",
"group": "CBC",
"search": "AllSky",
"area_50": 779.9136198124769,
"area_90": 2676.5074345784114,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.059442968908486146,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "25627948621ab130962cc30cc9e95143",
"classification": {
"BBH": 0.5936828544843631,
"BNS": 1.7921973828494038e-17,
"NSBH": 1.2874529472155797e-15,
"Terrestrial": 0.4063171455156356
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T21:37:11Z",
"superevent_id": "S250308ja",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T21:37:12.283492Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T21:37:12.283510Z",
"modified": "2025-03-08T21:37:12.293315Z"
}
}
],
"references": []
},
{
"event_id": "S250308kg",
"sequences": [
{
"id": 8340,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185789,
"topic": "igwn.gwalert",
"uuid": "df06206b-5362-49e0-8fd9-228c66714992",
"title": "S250308kg - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308kg/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308kg/view/"
},
"event": {
"far": 1.27295e-05,
"time": "2025-03-08T23:37:54.434Z",
"group": "Burst",
"search": "AllSky",
"area_50": 188.8410701725126,
"area_90": 874.5439783100361,
"duration": 0.037972,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "50d3bef8b0d958f30129f3c23abdada4",
"classification": {},
"skymap_version": 0,
"central_frequency": 312.434418
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T23:39:40Z",
"superevent_id": "S250308kg",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T23:39:40.956068Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T23:39:40.956084Z",
"modified": "2025-03-08T23:39:40.973525Z"
}
},
{
"id": 8341,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185790,
"topic": "igwn.gwalert",
"uuid": "5aa09506-187b-4e80-81a0-2e4ddae67ff1",
"title": "S250308kg - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308kg/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308kg/view/"
},
"event": {
"far": 1.27295e-05,
"time": "2025-03-08T23:37:54.434Z",
"group": "Burst",
"search": "AllSky",
"area_50": 188.8410701725126,
"area_90": 874.5439783100361,
"duration": 0.037972,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "50d3bef8b0d958f30129f3c23abdada4",
"classification": {},
"skymap_version": 0,
"central_frequency": 312.434418
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T23:44:14Z",
"superevent_id": "S250308kg",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T23:44:15.573684Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T23:44:15.573704Z",
"modified": "2025-03-08T23:44:15.587774Z"
}
}
],
"references": []
},
{
"event_id": "S250308ki",
"sequences": [
{
"id": 8342,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185791,
"topic": "igwn.gwalert",
"uuid": "8fb84c74-a898-4887-9ca2-e9b40bc07120",
"title": "S250308ki - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308ki/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250308ki/view/"
},
"event": {
"far": 1.536924918115139e-05,
"time": "2025-03-08T23:53:36.546Z",
"group": "CBC",
"search": "AllSky",
"area_50": 344.47758550635837,
"area_90": 1351.0529453786758,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.9549150588324357,
"HasRemnant": 0.9902659165883639
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "290ad6d6c9c3f36fd935a5537d1213ff",
"classification": {
"BBH": 0.0,
"BNS": 0.00042551358345457413,
"NSBH": 0.0010706983135864727,
"Terrestrial": 0.9985037881029589
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-08T23:54:00Z",
"superevent_id": "S250308ki",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T23:54:01.839586Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T23:54:01.839604Z",
"modified": "2025-03-08T23:54:01.851117Z"
}
},
{
"id": 8343,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185792,
"topic": "igwn.gwalert",
"uuid": "ef81fe3b-3c37-4671-81d3-e5a972b38189",
"title": "S250308ki - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250308ki/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250308ki/view/"
},
"event": {
"far": 1.536924918115139e-05,
"time": "2025-03-08T23:53:36.545Z",
"group": "CBC",
"search": "AllSky",
"area_50": 440.7865312943398,
"area_90": 1543.0413667207306,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.9399720887590309,
"HasRemnant": 0.9373833277316653
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "12a2e72e92c3c28e919001ed2b0deb5e",
"classification": {
"BBH": 0.0,
"BNS": 0.00042681469896023704,
"NSBH": 0.0010693971980808405,
"Terrestrial": 0.9985037881029589
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-08T23:58:35Z",
"superevent_id": "S250308ki",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-08T23:58:36.491381Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-08T23:58:36.491396Z",
"modified": "2025-03-08T23:58:36.503447Z"
}
}
],
"references": []
},
{
"event_id": "S250309c",
"sequences": [
{
"id": 8344,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185793,
"topic": "igwn.gwalert",
"uuid": "93be5eb3-080c-4329-9a03-12ad5184411b",
"title": "S250309c - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309c/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250309c/view/"
},
"event": {
"far": 9.467672498431057e-06,
"time": "2025-03-09T00:23:04.183Z",
"group": "CBC",
"search": "AllSky",
"area_50": 4827.617047254633,
"area_90": 27078.970169093092,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.5178093613948829,
"HasRemnant": 0.41211764737997586
},
"instruments": [
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6dff58d9c7d9e6579c01fedb1363a212",
"classification": {
"BBH": 0.0,
"BNS": 0.0023358012246506806,
"NSBH": 0.0027143564711740536,
"Terrestrial": 0.9949498423041753
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-09T00:23:30Z",
"superevent_id": "S250309c",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T00:23:31.785399Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T00:23:31.785417Z",
"modified": "2025-03-09T00:23:31.798187Z"
}
},
{
"id": 8345,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185794,
"topic": "igwn.gwalert",
"uuid": "223429c3-6523-4278-ab38-0784f1747a1f",
"title": "S250309c - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309c/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250309c/view/"
},
"event": {
"far": 9.467672498431057e-06,
"time": "2025-03-09T00:23:04.183Z",
"group": "CBC",
"search": "AllSky",
"area_50": 4827.617047254633,
"area_90": 27078.970169093092,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.5178093613948829,
"HasRemnant": 0.41211764737997586
},
"instruments": [
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6dff58d9c7d9e6579c01fedb1363a212",
"classification": {
"BBH": 0.0,
"BNS": 0.0023358012246506806,
"NSBH": 0.0027143564711740536,
"Terrestrial": 0.9949498423041753
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-09T00:28:05Z",
"superevent_id": "S250309c",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T00:28:06.463909Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T00:28:06.463928Z",
"modified": "2025-03-09T00:28:06.478405Z"
}
}
],
"references": []
},
{
"event_id": "S250309bd",
"sequences": [
{
"id": 8346,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185795,
"topic": "igwn.gwalert",
"uuid": "d77ee2bb-d882-48ea-bdde-5d8181f49c19",
"title": "S250309bd - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309bd/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250309bd/view/"
},
"event": {
"far": 4.785845013046234e-06,
"time": "2025-03-09T06:35:06.794Z",
"group": "CBC",
"search": "AllSky",
"area_50": 380.829491514567,
"area_90": 1440.647542004968,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.8872705844536471,
"HasMassGap": 0.34907704239922405,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "de3d63ace9500bf1085974fd9c229450",
"classification": {
"BBH": 0.0032555095329023626,
"BNS": 0.0,
"NSBH": 0.004214814280582372,
"Terrestrial": 0.9925296761865152
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-09T06:35:36Z",
"superevent_id": "S250309bd",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T06:35:37.163445Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T06:35:37.163465Z",
"modified": "2025-03-09T06:35:37.175121Z"
}
},
{
"id": 8347,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185796,
"topic": "igwn.gwalert",
"uuid": "82f281b9-95ae-4d91-804f-223a63e73d5c",
"title": "S250309bd - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309bd/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250309bd/view/"
},
"event": {
"far": 4.785845013046234e-06,
"time": "2025-03-09T06:35:06.794Z",
"group": "CBC",
"search": "AllSky",
"area_50": 380.829491514567,
"area_90": 1440.647542004968,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.8872705844536471,
"HasMassGap": 0.34907704239922405,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "de3d63ace9500bf1085974fd9c229450",
"classification": {
"BBH": 0.0032555095329023626,
"BNS": 0.0,
"NSBH": 0.004214814280582372,
"Terrestrial": 0.9925296761865152
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-09T06:40:12Z",
"superevent_id": "S250309bd",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T06:40:13.814179Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T06:40:13.814196Z",
"modified": "2025-03-09T06:40:13.823151Z"
}
}
],
"references": []
},
{
"event_id": "S250309bo",
"sequences": [
{
"id": 8348,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185797,
"topic": "igwn.gwalert",
"uuid": "3a56d8ae-12cf-4df7-bdbd-a0b5f24024a7",
"title": "S250309bo - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309bo/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250309bo/view/"
},
"event": {
"far": 1.341298796543808e-05,
"time": "2025-03-09T06:56:37.709Z",
"group": "CBC",
"search": "AllSky",
"area_50": 291.60208585805486,
"area_90": 1668.5157666797998,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.11885402609086818,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6df266af70cee1d86c46dfd12e47d217",
"classification": {
"BBH": 0.08484745903304645,
"BNS": 4.882089165493555e-19,
"NSBH": 1.315402029889717e-16,
"Terrestrial": 0.9151525409669534
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-09T06:57:01Z",
"superevent_id": "S250309bo",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T06:57:03.053316Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T06:57:03.053334Z",
"modified": "2025-03-09T06:57:03.066885Z"
}
},
{
"id": 8349,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185798,
"topic": "igwn.gwalert",
"uuid": "75feed2c-12b7-4a19-b896-3c532bc33756",
"title": "S250309bo - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309bo/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250309bo/view/"
},
"event": {
"far": 2.100661767578635e-05,
"time": "2025-03-09T06:56:37.709Z",
"group": "CBC",
"search": "AllSky",
"area_50": 237.20536647780608,
"area_90": 1464.3575874821834,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04036324786324786,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6d6e698f8c3eaa3b21dc6c1de4881a62",
"classification": {
"BBH": 0.05142096738715629,
"BNS": 1.8808536456280446e-19,
"NSBH": 3.232326070106981e-17,
"Terrestrial": 0.9485790326128437
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-09T07:01:36Z",
"superevent_id": "S250309bo",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T07:01:37.610154Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T07:01:37.610170Z",
"modified": "2025-03-09T07:01:37.620780Z"
}
}
],
"references": []
},
{
"event_id": "S250309cn",
"sequences": [
{
"id": 8350,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185800,
"topic": "igwn.gwalert",
"uuid": "8c3b554c-5dd6-4f07-9666-0bcca1f3e913",
"title": "S250309cn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309cn/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250309cn/view/"
},
"event": {
"far": 6.115377619316306e-06,
"time": "2025-03-09T14:18:05.997Z",
"group": "CBC",
"search": "AllSky",
"area_50": 799.4271970636365,
"area_90": 3023.135710050624,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.00696372592924317,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "14bef017684be97fea00f9c56abed928",
"classification": {
"BBH": 0.20180441138782224,
"BNS": 9.665604486576831e-17,
"NSBH": 2.1304995477931773e-07,
"Terrestrial": 0.7981953755622229
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-09T14:18:31Z",
"superevent_id": "S250309cn",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T14:18:32.304976Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T14:18:32.304992Z",
"modified": "2025-03-09T14:18:32.315966Z"
}
},
{
"id": 8351,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185801,
"topic": "igwn.gwalert",
"uuid": "85b2ba00-c670-424e-9f93-877788a81593",
"title": "S250309cn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309cn/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250309cn/view/"
},
"event": {
"far": 6.431205273836392e-06,
"time": "2025-03-09T14:18:05.992Z",
"group": "CBC",
"search": "AllSky",
"area_50": 792.92267131325,
"area_90": 2880.4557903647246,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0041299748849658105,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "be46466007725775a75d06d80e2b08de",
"classification": {
"BBH": 0.1922428637555091,
"BNS": 7.283545138425158e-17,
"NSBH": 2.737603698890933e-07,
"Terrestrial": 0.8077568624841209
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-09T14:23:07Z",
"superevent_id": "S250309cn",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T14:23:07.915994Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T14:23:07.916011Z",
"modified": "2025-03-09T14:23:07.926961Z"
}
}
],
"references": []
},
{
"event_id": "S250309co",
"sequences": [
{
"id": 8352,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185802,
"topic": "igwn.gwalert",
"uuid": "d4c0b73d-8f5f-4668-814a-ddaf7ef00a92",
"title": "S250309co - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309co/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250309co/view/"
},
"event": {
"far": 8.880010581973552e-06,
"time": "2025-03-09T14:23:53.230Z",
"group": "CBC",
"search": "AllSky",
"area_50": 658.4258646681606,
"area_90": 2498.577181793644,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "c8ab5d31248bc2f4e84a2af2e033de81",
"classification": {
"BBH": 0.13263124754448266,
"BNS": 1.409221537272055e-15,
"NSBH": 3.0031814754179224e-10,
"Terrestrial": 0.8673687521551978
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-09T14:24:18Z",
"superevent_id": "S250309co",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T14:24:20.092276Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T14:24:20.092294Z",
"modified": "2025-03-09T14:24:20.099780Z"
}
},
{
"id": 8353,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185803,
"topic": "igwn.gwalert",
"uuid": "da2694b1-ce1d-4c2b-ae9e-7ad4fca11197",
"title": "S250309co - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309co/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250309co/view/"
},
"event": {
"far": 8.79762678432999e-07,
"time": "2025-03-09T14:23:53.916Z",
"group": "CBC",
"search": "AllSky",
"area_50": 404.6444486974339,
"area_90": 2116.698573222563,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.09781942288140728,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "e11cfb2df4b77d86315355f816cb95b1",
"classification": {
"BBH": 0.665356665966469,
"BNS": 2.775045532902818e-14,
"NSBH": 1.982665839475363e-12,
"Terrestrial": 0.3346433340315206
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-09T14:28:54Z",
"superevent_id": "S250309co",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T14:28:54.681962Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T14:28:54.681978Z",
"modified": "2025-03-09T14:28:54.691657Z"
}
}
],
"references": []
},
{
"event_id": "S250309db",
"sequences": [
{
"id": 8354,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185804,
"topic": "igwn.gwalert",
"uuid": "4aa09e3a-33ac-4b51-9b2c-6de4ec93b7ba",
"title": "S250309db - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309db/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250309db/view/"
},
"event": {
"far": 2.136527e-05,
"time": "2025-03-09T20:36:57.752Z",
"group": "CBC",
"search": "AllSky",
"area_50": 796.9093161280031,
"area_90": 2741.9723389048827,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.3735232237047694,
"HasRemnant": 0.011964754133550139
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "ff6edbaa2297347cd97f88a63b334e23",
"classification": {
"BBH": 0.0,
"BNS": 9.7664e-05,
"NSBH": 0.000497201,
"Terrestrial": 0.999405134
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-09T20:37:28Z",
"superevent_id": "S250309db",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T20:37:29.321706Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T20:37:29.321723Z",
"modified": "2025-03-09T20:37:29.339460Z"
}
},
{
"id": 8355,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185805,
"topic": "igwn.gwalert",
"uuid": "0d337161-337d-48a3-b35e-64994bd83b7a",
"title": "S250309db - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250309db/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250309db/view/"
},
"event": {
"far": 2.136527e-05,
"time": "2025-03-09T20:36:57.752Z",
"group": "CBC",
"search": "AllSky",
"area_50": 796.9093161280031,
"area_90": 2741.9723389048827,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.3735232237047694,
"HasRemnant": 0.011964754133550139
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "ff6edbaa2297347cd97f88a63b334e23",
"classification": {
"BBH": 0.0,
"BNS": 9.7664e-05,
"NSBH": 0.000497201,
"Terrestrial": 0.999405134
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-09T20:42:04Z",
"superevent_id": "S250309db",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-09T20:42:05.019370Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-09T20:42:05.019386Z",
"modified": "2025-03-09T20:42:05.029973Z"
}
}
],
"references": []
},
{
"event_id": "S250310h",
"sequences": [
{
"id": 8356,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185806,
"topic": "igwn.gwalert",
"uuid": "59ee146e-db63-4792-9b57-a52bad3deec0",
"title": "S250310h - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250310h/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250310h/view/"
},
"event": {
"far": 2.295309171083903e-05,
"time": "2025-03-10T00:45:27.228Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1466.665645006514,
"area_90": 14607.06660125515,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.026260429225946468,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "b30e6385a14e199fa4dc3b7b84c38860",
"classification": {
"BBH": 0.04539445917000462,
"BNS": 1.0769205923508465e-16,
"NSBH": 8.427035726552951e-15,
"Terrestrial": 0.9546055408299868
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-10T00:45:50Z",
"superevent_id": "S250310h",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-10T00:45:50.929556Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-10T00:45:50.929572Z",
"modified": "2025-03-10T00:45:50.941560Z"
}
},
{
"id": 8357,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185807,
"topic": "igwn.gwalert",
"uuid": "fb06cdca-8f5c-49a7-aed5-f632bb5daebe",
"title": "S250310h - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250310h/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250310h/view/"
},
"event": {
"far": 1.407411561920559e-05,
"time": "2025-03-10T00:45:27.224Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1106.1890243883179,
"area_90": 11414.39357487187,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.018157865123382366,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "739885793417a02f495b0b6b5dff13ef",
"classification": {
"BBH": 0.08270867706020618,
"BNS": 2.41519202706817e-16,
"NSBH": 1.8872955819248563e-14,
"Terrestrial": 0.9172913229397747
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-10T00:50:25Z",
"superevent_id": "S250310h",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-10T00:50:26.647099Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-10T00:50:26.647116Z",
"modified": "2025-03-10T00:50:26.659913Z"
}
}
],
"references": []
},
{
"event_id": "S250310bl",
"sequences": [
{
"id": 8358,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185808,
"topic": "igwn.gwalert",
"uuid": "ecdfe5f9-82d0-46b5-9c05-c99f6757be45",
"title": "S250310bl - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250310bl/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250310bl/view/"
},
"event": {
"far": 1.040538809177105e-06,
"time": "2025-03-10T10:09:49.087Z",
"group": "CBC",
"search": "AllSky",
"area_50": 346.89055473634045,
"area_90": 1284.1192771730855,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.2630313376467135,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "703881074f6407d9a250307e71fad51d",
"classification": {
"BBH": 0.0,
"BNS": 0.002472445269991356,
"NSBH": 0.015253919800158496,
"Terrestrial": 0.9822736349298502
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-10T10:10:15Z",
"superevent_id": "S250310bl",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-10T10:10:16.784823Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-10T10:10:16.784839Z",
"modified": "2025-03-10T10:10:16.804708Z"
}
},
{
"id": 8359,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185809,
"topic": "igwn.gwalert",
"uuid": "934b2086-7ff4-42f9-88e4-7cce354c5413",
"title": "S250310bl - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250310bl/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250310bl/view/"
},
"event": {
"far": 1.040538809177105e-06,
"time": "2025-03-10T10:09:49.087Z",
"group": "CBC",
"search": "AllSky",
"area_50": 346.89055473634045,
"area_90": 1284.1192771730855,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.2630313376467135,
"HasRemnant": 1.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "703881074f6407d9a250307e71fad51d",
"classification": {
"BBH": 0.0,
"BNS": 0.002472445269991356,
"NSBH": 0.015253919800158496,
"Terrestrial": 0.9822736349298502
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-10T10:14:51Z",
"superevent_id": "S250310bl",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-10T10:14:52.465903Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-10T10:14:52.465922Z",
"modified": "2025-03-10T10:14:52.477678Z"
}
}
],
"references": []
},
{
"event_id": "S250310eb",
"sequences": [
{
"id": 8360,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185810,
"topic": "igwn.gwalert",
"uuid": "a8f3c5b3-860c-4114-9ba3-07d781c8e383",
"title": "S250310eb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250310eb/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250310eb/view/"
},
"event": {
"far": 2.264082256233671e-05,
"time": "2025-03-10T23:43:28.670Z",
"group": "CBC",
"search": "AllSky",
"area_50": 590.8627262286616,
"area_90": 3707.9993245429355,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "079cb1758061ec5a4a800427c5dcb6b1",
"classification": {
"BBH": 0.04583839931184777,
"BNS": 7.259437805970432e-16,
"NSBH": 5.200945660348983e-14,
"Terrestrial": 0.9541616006880995
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-10T23:43:56Z",
"superevent_id": "S250310eb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-10T23:43:57.585661Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-10T23:43:57.585683Z",
"modified": "2025-03-10T23:43:57.605433Z"
}
},
{
"id": 8362,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185812,
"topic": "igwn.gwalert",
"uuid": "7006578e-a26a-48bd-891d-ade5390b0672",
"title": "S250310eb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250310eb/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250310eb/view/"
},
"event": {
"far": 2.264082256233671e-05,
"time": "2025-03-10T23:43:28.335Z",
"group": "CBC",
"search": "AllSky",
"area_50": 158.36421968078207,
"area_90": 1137.242889261131,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.07425216607731473,
"HasMassGap": 0.0015384615384615385,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "fbf31537288faeeae52868c608a587ca",
"classification": {
"BBH": 0.04583839931184777,
"BNS": 7.259437805970432e-16,
"NSBH": 5.200945660348983e-14,
"Terrestrial": 0.9541616006880995
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-10T23:48:32Z",
"superevent_id": "S250310eb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-10T23:48:33.318600Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-10T23:48:33.318619Z",
"modified": "2025-03-10T23:48:33.329651Z"
}
}
],
"references": []
},
{
"event_id": "S250310ec",
"sequences": [
{
"id": 8361,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185811,
"topic": "igwn.gwalert",
"uuid": "f4284463-05c3-48c2-885a-c4d4d035ce86",
"title": "S250310ec - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250310ec/view/"
},
"event": {
"far": 1.4509789847085843e-06,
"time": "2025-03-10T23:44:42.125Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7097.90635755084,
"area_90": 22775.072356450226,
"duration": 0.0625,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "a249687afa5c5a45dcaf9cc024156dd0",
"classification": {},
"skymap_version": 0,
"central_frequency": 96.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-10T23:45:25Z",
"superevent_id": "S250310ec",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-10T23:45:25.827847Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-10T23:45:25.827876Z",
"modified": "2025-03-10T23:45:25.840018Z"
}
},
{
"id": 8363,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185813,
"topic": "igwn.gwalert",
"uuid": "78e6715c-ae17-45e0-abb7-8cc44fe49719",
"title": "S250310ec - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250310ec/view/"
},
"event": {
"far": 1.4509789847085843e-06,
"time": "2025-03-10T23:44:42.125Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7097.90635755084,
"area_90": 22775.072356450226,
"duration": 0.0625,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "a249687afa5c5a45dcaf9cc024156dd0",
"classification": {},
"skymap_version": 0,
"central_frequency": 96.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-10T23:49:59Z",
"superevent_id": "S250310ec",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-10T23:50:00.539838Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-10T23:50:00.539859Z",
"modified": "2025-03-10T23:50:00.556415Z"
}
}
],
"references": []
},
{
"event_id": "S250311bb",
"sequences": [
{
"id": 8364,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185814,
"topic": "igwn.gwalert",
"uuid": "5547a2d0-a5d8-49d2-b4d0-2eca29a018c3",
"title": "S250311bb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250311bb/view/"
},
"event": {
"far": 6.969119815522903e-06,
"time": "2025-03-11T06:31:11.134Z",
"group": "Burst",
"search": "AllSky",
"area_50": 6402.131925670782,
"area_90": 22263.94252651663,
"duration": 0.21875,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "ea2b21d3b387ef1a7c8592529e19c594",
"classification": {},
"skymap_version": 0,
"central_frequency": 104.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-11T06:31:50Z",
"superevent_id": "S250311bb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T06:31:51.667926Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T06:31:51.667946Z",
"modified": "2025-03-11T06:31:51.683400Z"
}
},
{
"id": 8365,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185815,
"topic": "igwn.gwalert",
"uuid": "0b352a24-3aa7-48c1-8067-2c5c7655467a",
"title": "S250311bb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250311bb/view/"
},
"event": {
"far": 6.969119815522903e-06,
"time": "2025-03-11T06:31:11.134Z",
"group": "Burst",
"search": "AllSky",
"area_50": 6402.131925670782,
"area_90": 22263.94252651663,
"duration": 0.21875,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "ea2b21d3b387ef1a7c8592529e19c594",
"classification": {},
"skymap_version": 0,
"central_frequency": 104.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-11T06:36:24Z",
"superevent_id": "S250311bb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T06:36:25.372706Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T06:36:25.372727Z",
"modified": "2025-03-11T06:36:25.382165Z"
}
}
],
"references": []
},
{
"event_id": "S250311bk",
"sequences": [
{
"id": 8366,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185816,
"topic": "igwn.gwalert",
"uuid": "98673d95-c5d1-46fc-942f-1657e8f0e321",
"title": "S250311bk - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250311bk/view/"
},
"event": {
"far": 7.869741177109574e-06,
"time": "2025-03-11T07:41:34.139Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7466.356267798542,
"area_90": 22734.78626148009,
"duration": 0.21875,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "db03d016227a3f437976956008f92336",
"classification": {},
"skymap_version": 0,
"central_frequency": 96.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-11T07:42:14Z",
"superevent_id": "S250311bk",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T07:42:15.780348Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T07:42:15.780369Z",
"modified": "2025-03-11T07:42:15.798280Z"
}
},
{
"id": 8367,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185817,
"topic": "igwn.gwalert",
"uuid": "a3961625-46dc-41f3-86c0-76cdfe2246ae",
"title": "S250311bk - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250311bk/view/"
},
"event": {
"far": 7.869741177109574e-06,
"time": "2025-03-11T07:41:34.139Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7466.356267798542,
"area_90": 22734.78626148009,
"duration": 0.21875,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "db03d016227a3f437976956008f92336",
"classification": {},
"skymap_version": 0,
"central_frequency": 96.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-11T07:46:49Z",
"superevent_id": "S250311bk",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T07:46:50.465648Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T07:46:50.465671Z",
"modified": "2025-03-11T07:46:50.476447Z"
}
}
],
"references": []
},
{
"event_id": "S250311bn",
"sequences": [
{
"id": 8368,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185818,
"topic": "igwn.gwalert",
"uuid": "b07a188f-e4de-4885-9120-5ecf7b9919d7",
"title": "S250311bn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311bn/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250311bn/view/"
},
"event": {
"far": 1.141831176978448e-05,
"time": "2025-03-11T07:52:51.473Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1432.0447821415537,
"area_90": 5175.084616372055,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "3f92a8b776fca26cb20a5a68c2062b52",
"classification": {
"BBH": 0.10146157712826577,
"BNS": 7.355210779878192e-15,
"NSBH": 2.712448299101361e-09,
"Terrestrial": 0.8985384201592785
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-11T07:53:16Z",
"superevent_id": "S250311bn",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T07:53:17.357697Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T07:53:17.357716Z",
"modified": "2025-03-11T07:53:17.371351Z"
}
},
{
"id": 8369,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185819,
"topic": "igwn.gwalert",
"uuid": "a73c3f77-1911-4854-acea-5a6d67696c3e",
"title": "S250311bn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311bn/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250311bn/view/"
},
"event": {
"far": 1.141831176978448e-05,
"time": "2025-03-11T07:52:51.465Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1486.5988690802797,
"area_90": 5250.621044441061,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "ea09d1766f9b4dd5f309fecf8dac1daf",
"classification": {
"BBH": 0.10146157712826577,
"BNS": 7.355210779878192e-15,
"NSBH": 2.712448299101361e-09,
"Terrestrial": 0.8985384201592785
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-11T07:57:52Z",
"superevent_id": "S250311bn",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T07:57:53.068790Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T07:57:53.068810Z",
"modified": "2025-03-11T07:57:53.083243Z"
}
}
],
"references": []
},
{
"event_id": "S250311bp",
"sequences": [
{
"id": 8370,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185820,
"topic": "igwn.gwalert",
"uuid": "abf301a1-2495-43d2-ba84-532ebdbe5471",
"title": "S250311bp - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311bp/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250311bp/view/"
},
"event": {
"far": 1.847312735196614e-06,
"time": "2025-03-11T08:00:07.415Z",
"group": "CBC",
"search": "AllSky",
"area_50": 977.9869200823125,
"area_90": 3461.2469928508526,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.21700650197449786,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "3b31444892660dd91213636a82775f65",
"classification": {
"BBH": 0.2356768821538111,
"BNS": 0.0,
"NSBH": 0.03665995061207911,
"Terrestrial": 0.7276631672341098
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-11T08:00:32Z",
"superevent_id": "S250311bp",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T08:00:33.596862Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T08:00:33.596882Z",
"modified": "2025-03-11T08:00:33.610488Z"
}
},
{
"id": 8371,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185821,
"topic": "igwn.gwalert",
"uuid": "5946676a-0ae7-4dc6-9dff-1251054c3cfd",
"title": "S250311bp - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311bp/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250311bp/view/"
},
"event": {
"far": 1.847312735196614e-06,
"time": "2025-03-11T08:00:07.416Z",
"group": "CBC",
"search": "AllSky",
"area_50": 474.3582771027865,
"area_90": 2146.073850804954,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.23713045868022983,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "6643cd1a4f35deeee10cb1b28f77ec70",
"classification": {
"BBH": 0.2349040057197398,
"BNS": 0.0,
"NSBH": 0.03743282704615037,
"Terrestrial": 0.7276631672341098
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-11T08:05:08Z",
"superevent_id": "S250311bp",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T08:05:09.267173Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T08:05:09.267192Z",
"modified": "2025-03-11T08:05:09.278751Z"
}
}
],
"references": []
},
{
"event_id": "S250311bz",
"sequences": [
{
"id": 8372,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185822,
"topic": "igwn.gwalert",
"uuid": "52e1d611-ee5b-4e22-b4ca-3a7bd3f43c69",
"title": "S250311bz - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311bz/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250311bz/view/"
},
"event": {
"far": 1.214907e-05,
"time": "2025-03-11T11:43:20.635Z",
"group": "CBC",
"search": "AllSky",
"area_50": 596.1083115112312,
"area_90": 2015.144042152012,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.42974565712766977,
"HasRemnant": 0.5458485120633841
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "ef98fdf4f286a6706a74f45051534501",
"classification": {
"BBH": 0.0,
"BNS": 0.000416731,
"NSBH": 0.000586825,
"Terrestrial": 0.998996445
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-11T11:43:48Z",
"superevent_id": "S250311bz",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T11:43:49.668129Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T11:43:49.668148Z",
"modified": "2025-03-11T11:43:49.681302Z"
}
},
{
"id": 8373,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185823,
"topic": "igwn.gwalert",
"uuid": "657a5745-e10b-4bf9-b2c3-1aead7751518",
"title": "S250311bz - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311bz/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250311bz/view/"
},
"event": {
"far": 1.214907e-05,
"time": "2025-03-11T11:43:20.635Z",
"group": "CBC",
"search": "AllSky",
"area_50": 596.1083115112312,
"area_90": 2015.144042152012,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.42974565712766977,
"HasRemnant": 0.5458485120633841
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "ef98fdf4f286a6706a74f45051534501",
"classification": {
"BBH": 0.0,
"BNS": 0.000416731,
"NSBH": 0.000586825,
"Terrestrial": 0.998996445
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-11T11:48:24Z",
"superevent_id": "S250311bz",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T11:48:25.368576Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T11:48:25.368595Z",
"modified": "2025-03-11T11:48:25.378573Z"
}
}
],
"references": []
},
{
"event_id": "S250311cc",
"sequences": [
{
"id": 8374,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185824,
"topic": "igwn.gwalert",
"uuid": "1f39f98d-f31c-4794-b4dd-7249afbdecdb",
"title": "S250311cc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311cc/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250311cc/view/"
},
"event": {
"far": 2.01783e-05,
"time": "2025-03-11T12:11:28.152Z",
"group": "CBC",
"search": "BBH",
"area_50": 569.8803850983824,
"area_90": 1874.9820034017466,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 6.689942068319845e-05,
"HasMassGap": 0.11395085959791841,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "0e0c33c11032e21419787e0ef7be0cd7",
"classification": {
"BBH": 0.0012549604710518913,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9987450395289481
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-11T12:12:44Z",
"superevent_id": "S250311cc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T12:12:44.791044Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T12:12:44.791063Z",
"modified": "2025-03-11T12:12:44.802792Z"
}
},
{
"id": 8375,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185825,
"topic": "igwn.gwalert",
"uuid": "8371ef8f-5029-4165-8ee5-7386fe36ff72",
"title": "S250311cc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311cc/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250311cc/view/"
},
"event": {
"far": 2.01783e-05,
"time": "2025-03-11T12:11:28.152Z",
"group": "CBC",
"search": "BBH",
"area_50": 569.8803850983824,
"area_90": 1874.9820034017466,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 6.689942068319845e-05,
"HasMassGap": 0.11395085959791841,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "0e0c33c11032e21419787e0ef7be0cd7",
"classification": {
"BBH": 0.0012549604710518913,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9987450395289481
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-11T12:17:18Z",
"superevent_id": "S250311cc",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T12:17:19.494114Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T12:17:19.494134Z",
"modified": "2025-03-11T12:17:19.505018Z"
}
}
],
"references": []
},
{
"event_id": "S250311da",
"sequences": [
{
"id": 8376,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185826,
"topic": "igwn.gwalert",
"uuid": "369f6b51-3a0b-4150-9025-e02d0cca8f18",
"title": "S250311da - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311da/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250311da/view/"
},
"event": {
"far": 1.231670077008978e-05,
"time": "2025-03-11T22:39:13.132Z",
"group": "CBC",
"search": "AllSky",
"area_50": 854.610754236271,
"area_90": 3302.620493905942,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.018157865123382366,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "fa15e322ed2380af9951edd6a250b14c",
"classification": {
"BBH": 0.09383013979172614,
"BNS": 1.87096419655509e-14,
"NSBH": 1.427040773413477e-12,
"Terrestrial": 0.9061698602068281
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-11T22:39:38Z",
"superevent_id": "S250311da",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T22:39:39.163997Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T22:39:39.164020Z",
"modified": "2025-03-11T22:39:39.181832Z"
}
},
{
"id": 8377,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185827,
"topic": "igwn.gwalert",
"uuid": "1dc58ee7-4e6d-47b7-9137-09c1029e4f1b",
"title": "S250311da - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311da/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250311da/view/"
},
"event": {
"far": 1.231670077008978e-05,
"time": "2025-03-11T22:39:13.132Z",
"group": "CBC",
"search": "AllSky",
"area_50": 854.610754236271,
"area_90": 3302.620493905942,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.018157865123382366,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "fa15e322ed2380af9951edd6a250b14c",
"classification": {
"BBH": 0.09383013979172614,
"BNS": 1.87096419655509e-14,
"NSBH": 1.427040773413477e-12,
"Terrestrial": 0.9061698602068281
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-11T22:44:13Z",
"superevent_id": "S250311da",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T22:44:14.873523Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T22:44:14.873545Z",
"modified": "2025-03-11T22:44:14.888073Z"
}
}
],
"references": []
},
{
"event_id": "S250311dk",
"sequences": [
{
"id": 8378,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185828,
"topic": "igwn.gwalert",
"uuid": "7bb80856-61f6-4b6a-8c5d-58e03fd137d1",
"title": "S250311dk - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311dk/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250311dk/view/"
},
"event": {
"far": 1.911415e-05,
"time": "2025-03-11T23:53:15.974Z",
"group": "CBC",
"search": "AllSky",
"area_50": 375.4789945263458,
"area_90": 1927.0182094048394,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.6269817856895504,
"HasRemnant": 0.2622081561919801
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "0950c4e154a1463ddf9783dbcd9b3214",
"classification": {
"BBH": 0.0,
"BNS": 0.000574915,
"NSBH": 0.00022586,
"Terrestrial": 0.999199225
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-11T23:53:45Z",
"superevent_id": "S250311dk",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T23:53:45.955764Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T23:53:45.955784Z",
"modified": "2025-03-11T23:53:45.974037Z"
}
},
{
"id": 8379,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185829,
"topic": "igwn.gwalert",
"uuid": "bee499d4-12ff-491b-80a5-640a0b9bd4b1",
"title": "S250311dk - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250311dk/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250311dk/view/"
},
"event": {
"far": 1.911415e-05,
"time": "2025-03-11T23:53:15.974Z",
"group": "CBC",
"search": "AllSky",
"area_50": 375.4789945263458,
"area_90": 1927.0182094048394,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.6269817856895504,
"HasRemnant": 0.2622081561919801
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "0950c4e154a1463ddf9783dbcd9b3214",
"classification": {
"BBH": 0.0,
"BNS": 0.000574915,
"NSBH": 0.00022586,
"Terrestrial": 0.999199225
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-11T23:58:19Z",
"superevent_id": "S250311dk",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-11T23:58:21.038340Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-11T23:58:21.038361Z",
"modified": "2025-03-11T23:58:21.049087Z"
}
}
],
"references": []
},
{
"event_id": "S250312cl",
"sequences": [
{
"id": 8380,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185830,
"topic": "igwn.gwalert",
"uuid": "847bbfb4-84cb-4223-b2d2-83dc57d02cfb",
"title": "S250312cl - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250312cl/view/"
},
"event": {
"far": 1.8683702664022166e-05,
"time": "2025-03-12T14:26:46.729Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7418.516530021505,
"area_90": 22620.642325731373,
"duration": 0.25,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f3d375abbd61faf260f1895179f37110",
"classification": {},
"skymap_version": 0,
"central_frequency": 160.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-12T14:27:25Z",
"superevent_id": "S250312cl",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T14:27:26.206360Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T14:27:26.206378Z",
"modified": "2025-03-12T14:27:26.221234Z"
}
},
{
"id": 8381,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185831,
"topic": "igwn.gwalert",
"uuid": "2daff136-eaf4-42d3-b832-826b2fded328",
"title": "S250312cl - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250312cl/view/"
},
"event": {
"far": 1.8683702664022166e-05,
"time": "2025-03-12T14:26:46.729Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7418.516530021505,
"area_90": 22620.642325731373,
"duration": 0.25,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f3d375abbd61faf260f1895179f37110",
"classification": {},
"skymap_version": 0,
"central_frequency": 160.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-12T14:31:59Z",
"superevent_id": "S250312cl",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T14:32:00.844024Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T14:32:00.844043Z",
"modified": "2025-03-12T14:32:00.856586Z"
}
}
],
"references": []
},
{
"event_id": "S250312df",
"sequences": [
{
"id": 8382,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185832,
"topic": "igwn.gwalert",
"uuid": "6a9beb4f-9306-4f7d-ba83-5f9aaedee77e",
"title": "S250312df - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312df/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250312df/view/"
},
"event": {
"far": 9.973919050180698e-06,
"time": "2025-03-12T15:13:22.410Z",
"group": "CBC",
"search": "AllSky",
"area_50": 223.09474206769335,
"area_90": 986.5896799457269,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6a3ed3911788dbb49acd9abb076e5cfb",
"classification": {
"BBH": 0.11698348191708469,
"BNS": 4.836345002705094e-18,
"NSBH": 3.098674567356119e-16,
"Terrestrial": 0.883016518082915
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-12T15:13:52Z",
"superevent_id": "S250312df",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T15:13:53.336368Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T15:13:53.336387Z",
"modified": "2025-03-12T15:13:53.353741Z"
}
},
{
"id": 8383,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185833,
"topic": "igwn.gwalert",
"uuid": "1912407a-aaf0-4ef0-aa96-a7ebad6f61f8",
"title": "S250312df - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312df/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250312df/view/"
},
"event": {
"far": 9.973919050180698e-06,
"time": "2025-03-12T15:13:22.409Z",
"group": "CBC",
"search": "AllSky",
"area_50": 231.27785510850222,
"area_90": 956.5849321294276,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "5d6c7bc813f8264266263b2edfd042ca",
"classification": {
"BBH": 0.11698348191708469,
"BNS": 4.836345002705094e-18,
"NSBH": 3.098674567356119e-16,
"Terrestrial": 0.883016518082915
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-12T15:18:28Z",
"superevent_id": "S250312df",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T15:18:29.063156Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T15:18:29.063172Z",
"modified": "2025-03-12T15:18:29.075897Z"
}
}
],
"references": []
},
{
"event_id": "S250312er",
"sequences": [
{
"id": 8384,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185834,
"topic": "igwn.gwalert",
"uuid": "8e56d088-dd45-4ee2-92f0-7e685dd77b24",
"title": "S250312er - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312er/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250312er/view/"
},
"event": {
"far": 1.341050458819198e-05,
"time": "2025-03-12T17:24:43.128Z",
"group": "CBC",
"search": "AllSky",
"area_50": 727.457766986779,
"area_90": 3612.3198489888628,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.018157865123382366,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "77c484044196e1e9a51dee8514091343",
"classification": {
"BBH": 0.08460377680786135,
"BNS": 2.242995146614473e-15,
"NSBH": 1.7188377997037705e-13,
"Terrestrial": 0.9153962231919646
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-12T17:25:05Z",
"superevent_id": "S250312er",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T17:25:06.352590Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T17:25:06.352608Z",
"modified": "2025-03-12T17:25:06.372410Z"
}
},
{
"id": 8385,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185835,
"topic": "igwn.gwalert",
"uuid": "c955dd0a-a0ee-4d36-b40c-d8b1c46f5b76",
"title": "S250312er - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312er/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250312er/view/"
},
"event": {
"far": 1.341050458819198e-05,
"time": "2025-03-12T17:24:43.113Z",
"group": "CBC",
"search": "AllSky",
"area_50": 658.4258646681604,
"area_90": 3467.9613420125424,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.030764199965011327,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "726d10bf8958272fa79e2b7cc0ccb41a",
"classification": {
"BBH": 0.08460377680786135,
"BNS": 2.242995146614473e-15,
"NSBH": 1.7188377997037705e-13,
"Terrestrial": 0.9153962231919646
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-12T17:29:43Z",
"superevent_id": "S250312er",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T17:29:44.049435Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T17:29:44.049452Z",
"modified": "2025-03-12T17:29:44.066716Z"
}
}
],
"references": []
},
{
"event_id": "S250312gd",
"sequences": [
{
"id": 8386,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185836,
"topic": "igwn.gwalert",
"uuid": "1462e7fd-9776-4f65-a418-979478b5263c",
"title": "S250312gd - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312gd/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250312gd/view/"
},
"event": {
"far": 8.69697e-06,
"time": "2025-03-12T18:59:52.592Z",
"group": "Burst",
"search": "AllSky",
"area_50": 902.2406686020045,
"area_90": 3551.890706533658,
"duration": 0.008735,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "1e70390f4a924035bac0d1ce99b965da",
"classification": {},
"skymap_version": 0,
"central_frequency": 202.152954
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-12T19:01:21Z",
"superevent_id": "S250312gd",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T19:01:22.183493Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T19:01:22.183512Z",
"modified": "2025-03-12T19:01:22.199823Z"
}
},
{
"id": 8387,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185837,
"topic": "igwn.gwalert",
"uuid": "69a6fff4-bb3e-49c5-8cda-862d3e462fe7",
"title": "S250312gd - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312gd/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250312gd/view/"
},
"event": {
"far": 8.69697e-06,
"time": "2025-03-12T18:59:52.592Z",
"group": "Burst",
"search": "AllSky",
"area_50": 902.2406686020045,
"area_90": 3551.890706533658,
"duration": 0.008735,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "1e70390f4a924035bac0d1ce99b965da",
"classification": {},
"skymap_version": 0,
"central_frequency": 202.152954
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-12T19:05:57Z",
"superevent_id": "S250312gd",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T19:05:58.809392Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T19:05:58.809410Z",
"modified": "2025-03-12T19:05:58.820633Z"
}
}
],
"references": []
},
{
"event_id": "S250312hz",
"sequences": [
{
"id": 8388,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185838,
"topic": "igwn.gwalert",
"uuid": "afbfc57b-0eea-4616-ade8-7cb7ae568774",
"title": "S250312hz - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312hz/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250312hz/view/"
},
"event": {
"far": 6.701576738435314e-06,
"time": "2025-03-12T20:36:19.871Z",
"group": "CBC",
"search": "AllSky",
"area_50": 210.61024909517724,
"area_90": 1635.7833145165644,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.8893662001546467,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "a609806d4136d8dfa8f28c31ed86f61f",
"classification": {
"BBH": 0.0,
"BNS": 0.0006585404530651745,
"NSBH": 0.0019484367880701508,
"Terrestrial": 0.9973930227588647
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-12T20:36:49Z",
"superevent_id": "S250312hz",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T20:36:50.503505Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T20:36:50.503523Z",
"modified": "2025-03-12T20:36:50.521299Z"
}
},
{
"id": 8389,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185839,
"topic": "igwn.gwalert",
"uuid": "f0dcfa7a-1186-45a9-a486-c47d486e7f56",
"title": "S250312hz - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312hz/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250312hz/view/"
},
"event": {
"far": 6.701576738435314e-06,
"time": "2025-03-12T20:36:19.871Z",
"group": "CBC",
"search": "AllSky",
"area_50": 187.63458555752155,
"area_90": 1566.9612356092487,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.7133545841786466,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "094552f9f39b7c7fcbc537c537abc5be",
"classification": {
"BBH": 0.0,
"BNS": 0.0006497299960975235,
"NSBH": 0.001957247245037821,
"Terrestrial": 0.9973930227588647
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-12T20:41:26Z",
"superevent_id": "S250312hz",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T20:41:28.170221Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T20:41:28.170238Z",
"modified": "2025-03-12T20:41:28.181808Z"
}
}
],
"references": []
},
{
"event_id": "S250312iz",
"sequences": [
{
"id": 8390,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185840,
"topic": "igwn.gwalert",
"uuid": "a898b364-475b-4b50-9117-e6c5ed7760dd",
"title": "S250312iz - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312iz/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250312iz/view/"
},
"event": {
"far": 7.78115e-06,
"time": "2025-03-12T21:29:01.781Z",
"group": "CBC",
"search": "BBH",
"area_50": 1818.7493291725987,
"area_90": 6155.379593978699,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "cf09baddd7475e006afdbc9b657a0dbe",
"classification": {
"BBH": 0.0037997464018953986,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9962002535981046
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-12T21:31:16Z",
"superevent_id": "S250312iz",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T21:31:16.781115Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T21:31:16.781135Z",
"modified": "2025-03-12T21:31:16.797715Z"
}
},
{
"id": 8391,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185841,
"topic": "igwn.gwalert",
"uuid": "f5bb815f-4e76-4082-9304-23c53d336994",
"title": "S250312iz - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312iz/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250312iz/view/"
},
"event": {
"far": 7.78115e-06,
"time": "2025-03-12T21:29:01.781Z",
"group": "CBC",
"search": "BBH",
"area_50": 1818.7493291725987,
"area_90": 6155.379593978699,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "cf09baddd7475e006afdbc9b657a0dbe",
"classification": {
"BBH": 0.0037997464018953986,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9962002535981046
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-12T21:35:51Z",
"superevent_id": "S250312iz",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T21:35:52.444785Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T21:35:52.444803Z",
"modified": "2025-03-12T21:35:52.455139Z"
}
}
],
"references": []
},
{
"event_id": "S250312jj",
"sequences": [
{
"id": 8392,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185842,
"topic": "igwn.gwalert",
"uuid": "7853200e-e346-41e6-933f-db2134551ff1",
"title": "S250312jj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312jj/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250312jj/view/"
},
"event": {
"far": 2.28276e-05,
"time": "2025-03-12T22:14:19.047Z",
"group": "CBC",
"search": "BBH",
"area_50": 736.8998204954046,
"area_90": 2368.486666785913,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0969116439116439,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "d59cbcea5d3358c02d761fb9206b036a",
"classification": {
"BBH": 0.0007509673517926974,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9992490326482073
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-12T22:15:48Z",
"superevent_id": "S250312jj",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T22:15:48.792038Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T22:15:48.792053Z",
"modified": "2025-03-12T22:15:48.809338Z"
}
},
{
"id": 8393,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185843,
"topic": "igwn.gwalert",
"uuid": "ad7d2a8d-32e6-4e73-9f6f-ca07b4026d8f",
"title": "S250312jj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312jj/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250312jj/view/"
},
"event": {
"far": 2.28276e-05,
"time": "2025-03-12T22:14:19.047Z",
"group": "CBC",
"search": "BBH",
"area_50": 736.8998204954046,
"area_90": 2368.486666785913,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0969116439116439,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "d59cbcea5d3358c02d761fb9206b036a",
"classification": {
"BBH": 0.0007509673517926974,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9992490326482073
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-12T22:20:22Z",
"superevent_id": "S250312jj",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T22:20:23.560006Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T22:20:23.560024Z",
"modified": "2025-03-12T22:20:23.571488Z"
}
}
],
"references": []
},
{
"event_id": "S250312kp",
"sequences": [
{
"id": 8394,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185844,
"topic": "igwn.gwalert",
"uuid": "4660fa0a-6396-4062-919b-c1579f673611",
"title": "S250312kp - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312kp/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250312kp/view/"
},
"event": {
"far": 1.522798038226081e-05,
"time": "2025-03-12T23:27:29.169Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1198.3015019502436,
"area_90": 4000.0735130764215,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0932026708942528,
"HasMassGap": 0.018157865123382366,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "c7612ae7b5b924dbd13763ce721e44a4",
"classification": {
"BBH": 0.07175323061660288,
"BNS": 8.305933644029165e-14,
"NSBH": 6.3278373510009155e-12,
"Terrestrial": 0.9282467693769862
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-12T23:28:04Z",
"superevent_id": "S250312kp",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T23:28:05.375320Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T23:28:05.375337Z",
"modified": "2025-03-12T23:28:05.388826Z"
}
},
{
"id": 8395,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185845,
"topic": "igwn.gwalert",
"uuid": "bcb4152b-4f5b-49df-aa0d-411347c7cfcf",
"title": "S250312kp - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250312kp/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250312kp/view/"
},
"event": {
"far": 1.522798038226081e-05,
"time": "2025-03-12T23:27:29.146Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1138.711653140251,
"area_90": 3806.196681032642,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.08963272127280575,
"HasMassGap": 0.030764199965011327,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "993b8807e873d1a086c3a4f52d671851",
"classification": {
"BBH": 0.07175323061660288,
"BNS": 8.305933644029165e-14,
"NSBH": 6.3278373510009155e-12,
"Terrestrial": 0.9282467693769862
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-12T23:32:40Z",
"superevent_id": "S250312kp",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-12T23:32:41.019759Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-12T23:32:41.019778Z",
"modified": "2025-03-12T23:32:41.028793Z"
}
}
],
"references": []
},
{
"event_id": "S250313j",
"sequences": [
{
"id": 8396,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185846,
"topic": "igwn.gwalert",
"uuid": "7e66b57f-ddc0-4cda-92a6-82d3bb4961c7",
"title": "S250313j - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313j/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250313j/view/"
},
"event": {
"far": 5.070801522754218e-07,
"time": "2025-03-13T00:35:32.882Z",
"group": "CBC",
"search": "AllSky",
"area_50": 628.4211168518613,
"area_90": 2891.36660775247,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.028157865123382364,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "8aac0507fba4bb79206f018ede749a55",
"classification": {
"BBH": 0.7687635122856312,
"BNS": 8.803367211158733e-15,
"NSBH": 6.372129824597451e-13,
"Terrestrial": 0.23123648771372274
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-13T00:35:57Z",
"superevent_id": "S250313j",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T00:35:58.069447Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T00:35:58.069472Z",
"modified": "2025-03-13T00:35:58.081791Z"
}
},
{
"id": 8397,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185847,
"topic": "igwn.gwalert",
"uuid": "c9e08297-4531-48bf-94df-f34c8b001e97",
"title": "S250313j - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313j/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250313j/view/"
},
"event": {
"far": 8.821739974992927e-07,
"time": "2025-03-13T00:35:32.883Z",
"group": "CBC",
"search": "AllSky",
"area_50": 635.1354660135506,
"area_90": 2886.330845881203,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.027430592396109635,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "5dc9f1ebde28dc33c534b6c285b9d351",
"classification": {
"BBH": 0.6462281558025509,
"BNS": 7.75103293810316e-15,
"NSBH": 5.613754371874592e-13,
"Terrestrial": 0.35377184419688
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-13T00:40:34Z",
"superevent_id": "S250313j",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T00:40:34.747700Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T00:40:34.747715Z",
"modified": "2025-03-13T00:40:34.759535Z"
}
}
],
"references": []
},
{
"event_id": "S250313aa",
"sequences": [
{
"id": 8398,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185848,
"topic": "igwn.gwalert",
"uuid": "7b918419-7b65-4552-ac1c-773435a5eb2d",
"title": "S250313aa - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313aa/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250313aa/view/"
},
"event": {
"far": 1.38103e-05,
"time": "2025-03-13T01:41:03.504Z",
"group": "Burst",
"search": "AllSky",
"area_50": 444.8256319619185,
"area_90": 2879.6164967195136,
"duration": 0.007305,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "04327a434ddd5f81c3046a549ce5064a",
"classification": {},
"skymap_version": 0,
"central_frequency": 921.628845
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-13T01:43:44Z",
"superevent_id": "S250313aa",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T01:43:45.197866Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T01:43:45.197892Z",
"modified": "2025-03-13T01:43:45.221788Z"
}
},
{
"id": 8399,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185849,
"topic": "igwn.gwalert",
"uuid": "394eee62-14c3-4974-9ff8-9dc5007242c3",
"title": "S250313aa - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313aa/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250313aa/view/"
},
"event": {
"far": 1.38103e-05,
"time": "2025-03-13T01:41:03.504Z",
"group": "Burst",
"search": "AllSky",
"area_50": 444.8256319619185,
"area_90": 2879.6164967195136,
"duration": 0.007305,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "04327a434ddd5f81c3046a549ce5064a",
"classification": {},
"skymap_version": 0,
"central_frequency": 921.628845
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-13T01:48:18Z",
"superevent_id": "S250313aa",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T01:48:18.838023Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T01:48:18.838041Z",
"modified": "2025-03-13T01:48:18.851189Z"
}
}
],
"references": []
},
{
"event_id": "S250313aj",
"sequences": [
{
"id": 8400,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185850,
"topic": "igwn.gwalert",
"uuid": "f07327dd-555b-43a5-8197-d2f8a5ac6e8f",
"title": "S250313aj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313aj/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250313aj/view/"
},
"event": {
"far": 2.600365524739991e-07,
"time": "2025-03-13T02:26:23.881Z",
"group": "CBC",
"search": "AllSky",
"area_50": 375.95109720177715,
"area_90": 1588.7828703847388,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "153ba703141582d06d472b7d8157bf35",
"classification": {
"BBH": 0.8607453294407755,
"BNS": 7.836131034683001e-19,
"NSBH": 5.269545200295504e-17,
"Terrestrial": 0.13925467055922447
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-13T02:26:46Z",
"superevent_id": "S250313aj",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T02:26:46.878522Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T02:26:46.878538Z",
"modified": "2025-03-13T02:26:46.894842Z"
}
},
{
"id": 8401,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185851,
"topic": "igwn.gwalert",
"uuid": "b7d17ae7-a6c3-4e34-ab79-ac3288095325",
"title": "S250313aj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313aj/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250313aj/view/"
},
"event": {
"far": 2.600365524739991e-07,
"time": "2025-03-13T02:26:23.880Z",
"group": "CBC",
"search": "AllSky",
"area_50": 346.2086286496064,
"area_90": 1463.5182938369724,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "79f70e9ab3df74f1272e6b4515109457",
"classification": {
"BBH": 0.8607453294407755,
"BNS": 7.836131034683001e-19,
"NSBH": 5.269545200295504e-17,
"Terrestrial": 0.13925467055922447
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-13T02:31:21Z",
"superevent_id": "S250313aj",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T02:31:22.623193Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T02:31:22.623210Z",
"modified": "2025-03-13T02:31:22.634844Z"
}
}
],
"references": []
},
{
"event_id": "S250313at",
"sequences": [
{
"id": 8402,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185852,
"topic": "igwn.gwalert",
"uuid": "1689428f-a2e3-4d4b-901f-ab2a6618b215",
"title": "S250313at - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313at/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250313at/view/"
},
"event": {
"far": 9.262191934014675e-06,
"time": "2025-03-13T03:01:37.870Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1367.419171460294,
"area_90": 4170.450123054288,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6d6542c25b4642fb64a10f31b1497588",
"classification": {
"BBH": 0.1278568895788256,
"BNS": 6.325820934247432e-15,
"NSBH": 4.641978370220647e-13,
"Terrestrial": 0.8721431104207039
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-13T03:02:01Z",
"superevent_id": "S250313at",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T03:02:02.574292Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T03:02:02.574309Z",
"modified": "2025-03-13T03:02:02.585188Z"
}
},
{
"id": 8403,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185853,
"topic": "igwn.gwalert",
"uuid": "fdbd72f4-3e90-4e19-ad62-7e69fdf82d10",
"title": "S250313at - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313at/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250313at/view/"
},
"event": {
"far": 9.262191934014675e-06,
"time": "2025-03-13T03:01:37.870Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1367.419171460294,
"area_90": 4170.450123054288,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "6d6542c25b4642fb64a10f31b1497588",
"classification": {
"BBH": 0.1278568895788256,
"BNS": 6.325820934247432e-15,
"NSBH": 4.641978370220647e-13,
"Terrestrial": 0.8721431104207039
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-13T03:06:36Z",
"superevent_id": "S250313at",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T03:06:37.243301Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T03:06:37.243318Z",
"modified": "2025-03-13T03:06:37.254643Z"
}
}
],
"references": []
},
{
"event_id": "S250313ba",
"sequences": [
{
"id": 8404,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185854,
"topic": "igwn.gwalert",
"uuid": "e55a45f4-db2b-4efa-a034-381bcc6993f0",
"title": "S250313ba - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313ba/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250313ba/view/"
},
"event": {
"far": 2.26384e-05,
"time": "2025-03-13T03:48:50.504Z",
"group": "CBC",
"search": "BBH",
"area_50": 198.9125939150466,
"area_90": 646.2561068125985,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f3c2b810b75893de81d72ca03bb11259",
"classification": {
"BBH": 0.000738012005908395,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9992619879940916
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-13T03:50:38Z",
"superevent_id": "S250313ba",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T03:50:39.982468Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T03:50:39.982485Z",
"modified": "2025-03-13T03:50:39.997096Z"
}
},
{
"id": 8405,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185855,
"topic": "igwn.gwalert",
"uuid": "983bc260-73a7-45e7-bf40-a36f1d027276",
"title": "S250313ba - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313ba/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250313ba/view/"
},
"event": {
"far": 2.26384e-05,
"time": "2025-03-13T03:48:50.504Z",
"group": "CBC",
"search": "BBH",
"area_50": 198.9125939150466,
"area_90": 646.2561068125985,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f3c2b810b75893de81d72ca03bb11259",
"classification": {
"BBH": 0.000738012005908395,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9992619879940916
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-13T03:55:14Z",
"superevent_id": "S250313ba",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T03:55:14.728850Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T03:55:14.728868Z",
"modified": "2025-03-13T03:55:14.740834Z"
}
}
],
"references": []
},
{
"event_id": "S250313bw",
"sequences": [
{
"id": 8406,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185856,
"topic": "igwn.gwalert",
"uuid": "a2f7142b-2375-456d-af82-8ec0d00ab235",
"title": "S250313bw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250313bw/view/"
},
"event": {
"far": 2.844254996885799e-06,
"time": "2025-03-13T04:53:08.899Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7118.8886986811185,
"area_90": 22576.159762535182,
"duration": 0.09375,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "8d990ed03cc94225d7dd050a99177f87",
"classification": {},
"skymap_version": 0,
"central_frequency": 296.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-13T04:53:46Z",
"superevent_id": "S250313bw",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T04:53:48.158349Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T04:53:48.158366Z",
"modified": "2025-03-13T04:53:48.168662Z"
}
},
{
"id": 8407,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185857,
"topic": "igwn.gwalert",
"uuid": "1b0faed4-d414-458e-8958-17d0eca9f817",
"title": "S250313bw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250313bw/view/"
},
"event": {
"far": 2.844254996885799e-06,
"time": "2025-03-13T04:53:08.899Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7118.8886986811185,
"area_90": 22576.159762535182,
"duration": 0.09375,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "8d990ed03cc94225d7dd050a99177f87",
"classification": {},
"skymap_version": 0,
"central_frequency": 296.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-13T04:58:21Z",
"superevent_id": "S250313bw",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T04:58:21.808424Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T04:58:21.808441Z",
"modified": "2025-03-13T04:58:21.818342Z"
}
}
],
"references": []
},
{
"event_id": "S250313cb",
"sequences": [
{
"id": 8408,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185858,
"topic": "igwn.gwalert",
"uuid": "ca7da80a-65f8-44d6-8fa5-cf1914badc7d",
"title": "S250313cb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313cb/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250313cb/view/"
},
"event": {
"far": 2.104952801587972e-05,
"time": "2025-03-13T05:12:52.303Z",
"group": "CBC",
"search": "AllSky",
"area_50": 904.758549537638,
"area_90": 2773.865497422907,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "4529b288235769f3ad84961ff7d76d1c",
"classification": {
"BBH": 0.04928849045632439,
"BNS": 9.944015816457104e-16,
"NSBH": 1.8157560041795267e-11,
"Terrestrial": 0.9507115095255171
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-03-13T05:13:32Z",
"superevent_id": "S250313cb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T05:13:33.780245Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T05:13:33.780262Z",
"modified": "2025-03-13T05:13:33.790102Z"
}
},
{
"id": 8409,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 185859,
"topic": "igwn.gwalert",
"uuid": "407831b5-ab6e-4284-b35b-e099ce79897d",
"title": "S250313cb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250313cb/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250313cb/view/"
},
"event": {
"far": 2.104952801587972e-05,
"time": "2025-03-13T05:12:52.303Z",
"group": "CBC",
"search": "AllSky",
"area_50": 853.7714605910597,
"area_90": 2649.650037931654,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.004106583072100313,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "0014ef8a0e20094f2f50ac0bb4f34d19",
"classification": {
"BBH": 0.04928849045632439,
"BNS": 9.944015816457104e-16,
"NSBH": 1.8157560041795267e-11,
"Terrestrial": 0.9507115095255171
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-03-13T05:18:07Z",
"superevent_id": "S250313cb",
"external_coinc": null
},
"message_text": "",
"published": "2025-03-13T05:18:08.388989Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-03-13T05:18:08.389006Z",
"modified": "2025-03-13T05:18:08.398229Z"
}
}
],
"references": []
}
]
}