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},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "eb0369eb3a59df9fe72537888c9b6a86",
"classification": {
"BBH": 0.9927880126144608,
"BNS": 4.811589372686276e-21,
"NSBH": 4.084920565817196e-19,
"Terrestrial": 0.007211987385539187
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-19T17:24:13Z",
"superevent_id": "S230819ax",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T17:24:14.830817Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T17:24:14.830840Z",
"modified": "2023-08-19T17:24:14.834720Z"
}
},
{
"id": 1255,
"sequence_number": 3,
"sequence_type": "INITIAL",
"message": {
"id": 2240,
"topic": "igwn.gwalert",
"uuid": "2ee3739d-df5b-4bf1-986b-fcc1ba6ac166",
"title": "S230819ax - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230819ax/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230819ax/view/"
},
"event": {
"far": 8.842249687858943e-09,
"time": "2023-08-19T17:19:10.455Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1004.8443167290696,
"area_90": 4125.967559858097,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": true,
"skymap_hash": "eb0369eb3a59df9fe72537888c9b6a86",
"classification": {
"BBH": 0.9927880126144608,
"BNS": 4.811589372686276e-21,
"NSBH": 4.084920565817196e-19,
"Terrestrial": 0.007211987385539187
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-08-19T17:37:59Z",
"superevent_id": "S230819ax",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T17:38:00.617169Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T17:38:00.617188Z",
"modified": "2023-08-19T17:38:00.620728Z"
}
},
{
"id": 1256,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 2247,
"topic": "igwn.gwalert",
"uuid": "048c6b4c-0779-4b48-9340-ee8154b82d21",
"title": "S230819ax - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230819ax/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S230819ax/view/"
},
"event": {
"far": 8.842249687858943e-09,
"time": "2023-08-19T17:19:10.455Z",
"group": "CBC",
"search": "AllSky",
"area_50": 848.7356987197926,
"area_90": 4042.877488982191,
"duration": null,
"pipeline": "gstlal",
"properties": {
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},
"instruments": [
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],
"significant": true,
"skymap_hash": "8cf9301d9da39c3f13367ea7768b9b17",
"classification": {
"BBH": 0.22510253270292888,
"BNS": 3.1665889186664814e-21,
"NSBH": 2.1734480489520617e-19,
"Terrestrial": 0.7748974672970711
},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-08-19T23:29:50Z",
"superevent_id": "S230819ax",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T23:29:51.433831Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T23:29:51.433853Z",
"modified": "2023-08-19T23:29:51.439185Z"
}
},
{
"id": 1610,
"sequence_number": 5,
"sequence_type": "UPDATE",
"message": {
"id": 2732,
"topic": "igwn.gwalert",
"uuid": "13e0c5c3-ddf9-4b8a-b5a1-1700bf5f8b74",
"title": "S230819ax - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230819ax/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S230819ax/view/"
},
"event": {
"far": 8.842249687858943e-09,
"time": "2023-08-19T17:19:10.455Z",
"group": "CBC",
"search": "AllSky",
"area_50": 848.7356987197926,
"area_90": 4042.877488982191,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "8cf9301d9da39c3f13367ea7768b9b17",
"classification": {
"BBH": 0.9927880126144608,
"BNS": 4.811589372686276e-21,
"NSBH": 4.084920565817196e-19,
"Terrestrial": 0.007211987385539187
},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 5,
"time_created": "2023-09-05T14:26:33Z",
"superevent_id": "S230819ax",
"external_coinc": null
},
"message_text": "",
"published": "2023-09-05T14:26:36.290419Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-09-05T14:26:36.290438Z",
"modified": "2023-09-05T14:26:36.294149Z"
}
}
],
"references": []
},
{
"event_id": "S230819a",
"sequences": [],
"references": [
{
"id": 2733,
"topic": "gcn.circular",
"uuid": "99130560-ff48-48af-a0d1-d4a9f5c90a56",
"title": "LIGO/Virgo/KAGRA S230819ax: Correction to PROB_BBH and PROB_TERRES probabilities",
"submitter": "Hop gcn.circular",
"authors": "Anjali Yelikar at Rochester Institute of Technology <ay2016@g.rit.edu>",
"data": {
"date": "23/09/05 14:35:24 GMT",
"from": "Anjali Yelikar at Rochester Institute of Technology <ay2016@g.rit.edu>",
"title": "GCN CIRCULAR",
"number": "34627",
"subject": "LIGO/Virgo/KAGRA S230819ax: Correction to PROB_BBH and PROB_TERRES probabilities"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\nThe trigger S230819ax had incorrect PROB_BBH and PROB_TERRES probabilities reported in the Update Circular number 34499. The correct values are 99% and 1% as reported in the Update Notice.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzOTI0NTI5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.BZEEb55FfIzXmyICIJc3GY0oAI56Gi58HDhN80_ohhk\n\n",
"published": "2023-09-05T14:35:34.956457Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-09-05T14:35:34.956493Z",
"modified": "2023-09-05T14:35:34.971961Z",
"targets": []
},
{
"id": 2248,
"topic": "gcn.circular",
"uuid": "6d673fe0-cc2f-4996-be7e-59e901e362ce",
"title": "LIGO/Virgo/KAGRA S230819ax: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Anjali Yelikar at Rochester Institute of Technology <ay2016@g.rit.edu>",
"data": {
"date": "23/08/19 23:49:10 GMT",
"from": "Anjali Yelikar at Rochester Institute of Technology <ay2016@g.rit.edu>",
"title": "GCN CIRCULAR",
"number": "34499",
"subject": "LIGO/Virgo/KAGRA S230819ax: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230819ax (GCN Circular 34494). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230819ax\n\nFor the Bilby.multiorder.fits sky map, the 90% credible region is 4044 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4216 +/- 1645 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/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDg4OTU2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3Ni_YXT-GUlZYW-SpQYtfYDv13EXV4xWlBwOKZoCnA8\n\n",
"published": "2023-08-19T23:49:23.123958Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T23:49:23.123975Z",
"modified": "2023-08-19T23:49:23.129571Z",
"targets": []
},
{
"id": 2242,
"topic": "gcn.circular",
"uuid": "a1ac3379-f1fb-473f-847e-bdaa03c46f04",
"title": "LIGO/Virgo/KAGRA S230819ax: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "sushant.sharma-chaudhary@ligo.org",
"data": {
"date": "23/08/19 17:55:28 GMT",
"from": "sushant.sharma-chaudhary@ligo.org",
"title": "GCN CIRCULAR",
"number": "34494",
"subject": "LIGO/Virgo/KAGRA S230819ax: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230819ax during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-19 17:19:10.455 UTC (GPS\ntime: 1376500768.455). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], oLIB [4], and SPIIR [5] analysis pipelines.\n\nS230819ax is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 8.8e-09 Hz, or about one in 3\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230819ax\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS\n(<1%).\n\nThere were noise transients at the LIGO Hanford and evidence for\nnonstationary noise at both LIGO detectors which may affect the\nparameters or the significance of the candidate.\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 25 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n4126 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 4872 +/- 1527 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Lynch et al. PRD 95, 104046 (2017)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDY3NzMxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.iPTcT1lICisXnVz-sx8N8amZnP6XhVXWomvOYP4CBGM\n\n",
"published": "2023-08-19T17:55:36.055289Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T17:55:36.055305Z",
"modified": "2023-08-19T17:55:36.058758Z",
"targets": []
}
]
},
{
"event_id": "S230820g",
"sequences": [
{
"id": 1257,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2249,
"topic": "igwn.gwalert",
"uuid": "5c99a6f0-4281-48dc-9ae0-3a980a3f3625",
"title": "S230820g - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230820g/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230820g/view/"
},
"event": {
"far": 1.051294289523686e-05,
"time": "2023-08-20T05:21:16.067Z",
"group": "CBC",
"search": "AllSky",
"area_50": 314.9449403654904,
"area_90": 1680.265877712756,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.004507266841791322,
"HasMassGap": 0.1297688043391692,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "633f17bfa2c7cd7d7c53acc23b637a12",
"classification": {
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"BNS": 7.035987468235321e-17,
"NSBH": 0.00027561655812840386,
"Terrestrial": 0.8613153540470624
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-20T05:21:40Z",
"superevent_id": "S230820g",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T05:21:41.872863Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T05:21:41.872885Z",
"modified": "2023-08-20T05:21:41.879289Z"
}
},
{
"id": 1258,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2250,
"topic": "igwn.gwalert",
"uuid": "70405e76-c0ea-41c5-a6ca-39f3e0f8c5e3",
"title": "S230820g - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230820g/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230820g/view/"
},
"event": {
"far": 1.051294289523686e-05,
"time": "2023-08-20T05:21:16.067Z",
"group": "CBC",
"search": "AllSky",
"area_50": 314.9449403654904,
"area_90": 1680.265877712756,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"HasMassGap": 0.1297688043391692,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "633f17bfa2c7cd7d7c53acc23b637a12",
"classification": {
"BBH": 0.13840902939480917,
"BNS": 7.035987468235321e-17,
"NSBH": 0.00027561655812840386,
"Terrestrial": 0.8613153540470624
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-20T05:26:15Z",
"superevent_id": "S230820g",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T05:26:16.533275Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T05:26:16.533307Z",
"modified": "2023-08-20T05:26:16.537421Z"
}
}
],
"references": []
},
{
"event_id": "S230820l",
"sequences": [
{
"id": 1259,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2252,
"topic": "igwn.gwalert",
"uuid": "107ad717-7b2c-416f-a3dd-258692dbf0d6",
"title": "S230820l - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230820l/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230820l/view/"
},
"event": {
"far": 8.17919e-06,
"time": "2023-08-20T11:42:13.018Z",
"group": "Burst",
"search": "AllSky",
"area_50": 753.0562231657198,
"area_90": 3805.567210798734,
"duration": 0.071002,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "25cda5bfd5df65f9cb2a44ae5a461aea",
"classification": {},
"skymap_version": 0,
"central_frequency": 82.541763
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-20T11:43:49Z",
"superevent_id": "S230820l",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T11:43:50.502611Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T11:43:50.502632Z",
"modified": "2023-08-20T11:43:50.508708Z"
}
},
{
"id": 1260,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2253,
"topic": "igwn.gwalert",
"uuid": "2f66864c-fb3c-4f1a-a8de-28de5fa09c73",
"title": "S230820l - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230820l/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230820l/view/"
},
"event": {
"far": 8.17919e-06,
"time": "2023-08-20T11:42:13.018Z",
"group": "Burst",
"search": "AllSky",
"area_50": 753.0562231657198,
"area_90": 3805.567210798734,
"duration": 0.071002,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "25cda5bfd5df65f9cb2a44ae5a461aea",
"classification": {},
"skymap_version": 0,
"central_frequency": 82.541763
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-20T11:48:24Z",
"superevent_id": "S230820l",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T11:48:26.294825Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T11:48:26.294846Z",
"modified": "2023-08-20T11:48:26.298505Z"
}
}
],
"references": []
},
{
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"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230820bq (GCN Circular 34504). 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/S230820bq\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 1373 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3600 +/- 1437 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/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzUwODg0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.RrO-OnLNOFXfhaW425gG9O3YXt3I-SXgiNhRdGDY25U\n\n",
"published": "2023-08-29T23:14:49.766693Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T23:14:49.766710Z",
"modified": "2023-08-29T23:14:49.770565Z",
"targets": []
},
{
"id": 2278,
"topic": "gcn.circular",
"uuid": "3613cb4d-bdf6-4db4-9e7f-054eb7c4ac77",
"title": "LIGO/Virgo/KAGRA S230820bq: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "sushant.sharma-chaudhary@ligo.org",
"data": {
"date": "23/08/20 21:49:25 GMT",
"from": "sushant.sharma-chaudhary@ligo.org",
"title": "GCN CIRCULAR",
"number": "34504",
"subject": "LIGO/Virgo/KAGRA S230820bq: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230820bq during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-20 21:25:15.975 UTC (GPS\ntime: 1376601933.975). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230820bq is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 4.2e-08 Hz, or about one in 8\nmonths. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230820bq\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (96%), Terrestrial (4%), BNS (<1%), or NSBH (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassGap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 29 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n1975 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 4785 +/- 1468 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNTY4MTcxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.s-MfmJgSzPd61_43M5_H1v72m4myc-Ay9CxM_pD6pIs\n\n",
"published": "2023-08-20T21:49:39.015306Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-20T21:49:39.015324Z",
"modified": "2023-08-20T21:49:39.019065Z",
"targets": []
}
]
},
{
"event_id": "S230821d",
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"message": {
"id": 2279,
"topic": "igwn.gwalert",
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"title": "S230821d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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}
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{
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"message": {
"id": 2280,
"topic": "igwn.gwalert",
"uuid": "659111c5-35e9-4237-9d58-86c3e41dd065",
"title": "S230821d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-08-21T01:42:49Z",
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"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T01:42:51.152893Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T01:42:51.152915Z",
"modified": "2023-08-21T01:42:51.156674Z"
}
}
],
"references": []
},
{
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"message": {
"id": 2281,
"topic": "igwn.gwalert",
"uuid": "984978e3-f40a-4289-8ab9-8406c2d0f271",
"title": "S230821e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
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"time": "2023-08-21T01:49:20.149Z",
"group": "CBC",
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"area_50": 5937.163246223796,
"area_90": 19102.32336500616,
"duration": null,
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"sequence_num": 1,
"time_created": "2023-08-21T01:49:44Z",
"superevent_id": "S230821e",
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},
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"published": "2023-08-21T01:49:46.143521Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T01:49:46.143541Z",
"modified": "2023-08-21T01:49:46.148123Z"
}
},
{
"id": 1285,
"sequence_number": 2,
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"message": {
"id": 2282,
"topic": "igwn.gwalert",
"uuid": "ece748f3-bfe1-40c1-bb3f-521203685fd4",
"title": "S230821e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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},
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"duration": null,
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"sequence_num": 2,
"time_created": "2023-08-21T01:54:18Z",
"superevent_id": "S230821e",
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},
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"published": "2023-08-21T01:54:19.812280Z",
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"created": "2023-08-21T01:54:19.812300Z",
"modified": "2023-08-21T01:54:19.815635Z"
}
}
],
"references": []
},
{
"event_id": "S230821ak",
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"message": {
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"topic": "igwn.gwalert",
"uuid": "84e1b812-af9e-4a70-b185-bedbcb1c85ed",
"title": "S230821ak - PRELIMINARY",
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"data": {
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"message": {
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"title": "S230821ak - PRELIMINARY",
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"references": []
},
{
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"message": {
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"message": {
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"topic": "igwn.gwalert",
"uuid": "94c2cdaf-da63-4e41-8fd9-60a04fdd1806",
"title": "S230821am - PRELIMINARY",
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{
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{
"id": 2369,
"topic": "gcn.circular",
"uuid": "6cafa360-3e73-49cf-aabf-83cc7a3493d5",
"title": "LIGO/Virgo/KAGRA S230822bm: Upper limits from Swift/BAT-GUANO",
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"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
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"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34530",
"subject": "LIGO/Virgo/KAGRA S230822bm: Upper limits from Swift/BAT-GUANO"
},
"message_text": "Samuele Ronchini (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), James DeLaunay (U Alabama) report:\n\nSwift/BAT was observing 95.46% of the GW localization probability (Bilby.multiorder.fits) at merger time. A fraction 71.37 % of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\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 [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-8 erg/s/cm^2:\n\ntime_bin (s) soft normal hard GRB170817\n------------------------------------\n0.256 34.1 29.0 26.9 30.9\n1.024 17.4 14.8 13.7 15.8\n4.096 9.39 7.98 7.40 8.52\n16.384 5.86 4.98 4.62 5.32\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.8277660\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively.\n\nThe corresponding fits file can be found here:\nhttps://doi.org/10.5281/zenodo.8277677\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyODMwMzE2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.NYa1W4XrizGzDbXKg0wCncvFfgy4UO2sDhHFMoMxtUM\n\n",
"published": "2023-08-23T22:38:45.791739Z",
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"created": "2023-08-23T22:38:45.791757Z",
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"title": "LIGO/Virgo/KAGRA S230822bm: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"data": {
"date": "23/08/23 02:28:53 GMT",
"from": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"title": "GCN CIRCULAR",
"number": "34522",
"subject": "LIGO/Virgo/KAGRA S230822bm: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230822bm (GCN Circular 34520). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230822bm\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3974 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5154 +/- 1771 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/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNzU3NzM4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.J8JBaKdFAD5i1_IP6u1yrKio3u81fGg08z_jyoHdGps\n\n",
"published": "2023-08-23T02:29:07.241883Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-23T02:29:07.241915Z",
"modified": "2023-08-23T02:29:07.253290Z",
"targets": []
},
{
"id": 2335,
"topic": "gcn.circular",
"uuid": "889fc053-8d31-4356-a0da-cd8b03cae86d",
"title": "LIGO/Virgo/KAGRA S230822bm: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Hideyuki Tagoshi at ICRR/U of Tokyo/KAGRA <tagoshi@icrr.u-tokyo.ac.jp>",
"data": {
"date": "23/08/22 23:50:00 GMT",
"from": "Hideyuki Tagoshi at ICRR/U of Tokyo/KAGRA <tagoshi@icrr.u-tokyo.ac.jp>",
"title": "GCN CIRCULAR",
"number": "34520",
"subject": "LIGO/Virgo/KAGRA S230822bm: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230822bm during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-22 23:03:37.497 UTC (GPS\ntime: 1376780635.497). The candidate was found by the CWB [1] and\nGstLAL [2] analysis pipelines.\n\nS230822bm is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 2.6e-08 Hz, or about one in 1\nyear, 2 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230822bm\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (98%), Terrestrial (2%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [3] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [3] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassGap) is 4%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [4], distributed via GCN notice about 27 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [4], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n4472 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 6854 +/- 2325 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Chatterjee et al. ApJ 896, 54 (2020)\n [4] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNzQ4MjA2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Z43bFUFCr_0SuyeVSSDXt5P9kNVUY13JUHMR_eiK4yw\n\n",
"published": "2023-08-22T23:50:15.629701Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-22T23:50:15.629729Z",
"modified": "2023-08-22T23:50:15.641289Z",
"targets": []
}
]
},
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"title": "S230823d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 1,
"time_created": "2023-08-23T02:20:01Z",
"superevent_id": "S230823i",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-23T02:20:02.141400Z",
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"retracted": false,
"created": "2023-08-23T02:20:02.141433Z",
"modified": "2023-08-23T02:20:02.153278Z"
}
},
{
"id": 1327,
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"message": {
"id": 2341,
"topic": "igwn.gwalert",
"uuid": "a1b75d53-7b96-4f27-a33f-f790d42a6187",
"title": "S230823i - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 2,
"time_created": "2023-08-23T02:24:37Z",
"superevent_id": "S230823i",
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},
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"published": "2023-08-23T02:24:38.986729Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-23T02:24:38.986763Z",
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}
}
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},
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"message": {
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"topic": "igwn.gwalert",
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"message": {
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"topic": "igwn.gwalert",
"uuid": "4f542206-2148-49ad-9b10-fb1ea4ed2ebe",
"title": "S230823n - PRELIMINARY",
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"group": "CBC",
"search": "AllSky",
"area_50": 748.2302847057554,
"area_90": 2853.5983937179676,
"duration": null,
"pipeline": "spiir",
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"significant": true,
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"sequence_num": 1,
"time_created": "2023-08-24T03:31:18Z",
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"published": "2023-08-24T03:31:19.902898Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T03:31:19.902919Z",
"modified": "2023-08-24T03:31:19.906602Z"
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{
"id": 1357,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2384,
"topic": "igwn.gwalert",
"uuid": "45bd6925-fe5c-4bc8-a905-54f860a0f904",
"title": "S230824r - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"event": {
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"area_50": 748.2302847057554,
"area_90": 2853.5983937179676,
"duration": null,
"pipeline": "spiir",
"properties": {
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"skymap_version": 0,
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-24T03:35:58Z",
"superevent_id": "S230824r",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T03:35:59.678398Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T03:35:59.678433Z",
"modified": "2023-08-24T03:35:59.683797Z"
}
},
{
"id": 1362,
"sequence_number": 3,
"sequence_type": "INITIAL",
"message": {
"id": 2389,
"topic": "igwn.gwalert",
"uuid": "d910a4c4-0a9b-42ec-818b-6ce733234b8a",
"title": "S230824r - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"event": {
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"time": "2023-08-24T03:30:47.748Z",
"group": "CBC",
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"area_50": 748.2302847057554,
"area_90": 2853.5983937179676,
"duration": null,
"pipeline": "spiir",
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"significant": true,
"skymap_hash": "d4df40438c742bd7d2d20278c9bb683e",
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},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-08-24T04:19:29Z",
"superevent_id": "S230824r",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T04:19:30.162237Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T04:19:30.162258Z",
"modified": "2023-08-24T04:19:30.166181Z"
}
},
{
"id": 1367,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 2395,
"topic": "igwn.gwalert",
"uuid": "85c1e1f1-f647-4326-af41-e7f0d5924912",
"title": "S230824r - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230824r/view/"
},
"event": {
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"time": "2023-08-24T03:30:47.748Z",
"group": "CBC",
"search": "AllSky",
"area_50": 976.7279796144957,
"area_90": 3278.2809781948176,
"duration": null,
"pipeline": "spiir",
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"sequence_num": 4,
"time_created": "2023-08-24T07:43:47Z",
"superevent_id": "S230824r",
"external_coinc": null
},
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"published": "2023-08-24T07:43:49.001432Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T07:43:49.001453Z",
"modified": "2023-08-24T07:43:49.009253Z"
}
}
],
"references": [
{
"id": 2396,
"topic": "gcn.circular",
"uuid": "7023c6f1-8ea1-4ac3-9bcb-39484d8a27b7",
"title": "LIGO/Virgo/KAGRA S230824r: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Michael J. Williams at University of Glasgow <michael.williams@ligo.org>",
"data": {
"date": "23/08/24 07:55:43 GMT",
"from": "Michael J. Williams at University of Glasgow <michael.williams@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34535",
"subject": "LIGO/Virgo/KAGRA S230824r: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230824r (GCN Circular 34534). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230824r\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3279 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4701 +/- 1563 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/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyODYzNzQ5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.jZYk2LqdxM9eUcgdQT_cmXrfd7M_MoVdHG12ejWO6qk\n\n",
"published": "2023-08-24T07:55:59.042196Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-24T07:55:59.042213Z",
"modified": "2023-08-24T07:55:59.048707Z",
"targets": []
},
{
"id": 2390,
"topic": "gcn.circular",
"uuid": "50fef18c-c3f5-48eb-912b-fd232558977f",
"title": "LIGO/Virgo/KAGRA S230824r: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Hajime Sotani at RIKEN <h.sotani@gmail.com>",
"data": {
"date": "23/08/24 04:39:15 GMT",
"from": "Hajime Sotani at RIKEN <h.sotani@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34534",
"subject": "LIGO/Virgo/KAGRA S230824r: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230824r during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-24 03:30:47.748 UTC (GPS\ntime: 1376883065.748). The candidate was found by the CWB [1], GstLAL\n[2], PyCBC Live [3], and SPIIR [4] analysis pipelines.\n\nS230824r is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.6e-11 Hz, or about one in 1e3\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230824r\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH\n(<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [5] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [5] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassGap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [6], distributed via GCN notice about 30 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [6], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n2854 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 4714 +/- 1348 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Dal Canton et al. ApJ 923, 254 (2021)\n [4] Chu et al. PRD 105, 024023 (2022)\n [5] Chatterjee et al. ApJ 896, 54 (2020)\n [6] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyODUxOTYwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.x-CceQWFaS4kqmbhZs-RQW4Xqm6npmPR-RvpFNUR4mk\n\n",
"published": "2023-08-24T04:39:29.724657Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-24T04:39:29.724673Z",
"modified": "2023-08-24T04:39:29.730213Z",
"targets": []
}
]
},
{
"event_id": "S230824u",
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"message": {
"id": 2385,
"topic": "igwn.gwalert",
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"title": "S230824u - PRELIMINARY",
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"authors": "LVK",
"data": {
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{
"id": 1359,
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"message": {
"id": 2386,
"topic": "igwn.gwalert",
"uuid": "ca46dba4-c49f-4104-896c-2a89917761c0",
"title": "S230824u - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230824u/view/"
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"event": {
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"time": "2023-08-24T04:02:46.613Z",
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"superevent_id": "S230824u",
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},
"message_text": "",
"published": "2023-08-24T04:08:41.636071Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T04:08:41.636090Z",
"modified": "2023-08-24T04:08:41.639995Z"
}
}
],
"references": []
},
{
"event_id": "S230824w",
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"time": "2023-08-24T04:13:24.501Z",
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"time_created": "2023-08-24T04:14:36Z",
"superevent_id": "S230824w",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T04:14:36.419484Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T04:14:36.419504Z",
"modified": "2023-08-24T04:14:36.427860Z"
}
},
{
"id": 1361,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2388,
"topic": "igwn.gwalert",
"uuid": "3d99ad35-57bf-480d-82db-0d453945eb45",
"title": "S230824w - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230824w/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230824w/view/"
},
"event": {
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"time": "2023-08-24T04:13:24.501Z",
"group": "Burst",
"search": "AllSky",
"area_50": 1316.851729336321,
"area_90": 4914.903586356593,
"duration": 0.009019,
"pipeline": "CWB",
"properties": {},
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"skymap_hash": "eeee30d6c7453dfc194eb7dc526c9f16",
"classification": {},
"skymap_version": 0,
"central_frequency": 903.678223
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-24T04:19:10Z",
"superevent_id": "S230824w",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T04:19:11.095526Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T04:19:11.095547Z",
"modified": "2023-08-24T04:19:11.099318Z"
}
}
],
"references": []
},
{
"event_id": "S230824y",
"sequences": [
{
"id": 1363,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2391,
"topic": "igwn.gwalert",
"uuid": "7981a9a7-2fa8-46ca-9870-88f3b680ed3b",
"title": "S230824y - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230824y/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230824y/view/"
},
"event": {
"far": 1.698234364979786e-05,
"time": "2023-08-24T05:03:36.848Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1421.3437881651112,
"area_90": 11944.82715864533,
"duration": null,
"pipeline": "gstlal",
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"HasMassGap": 0.013379310344827587,
"HasRemnant": 0.0
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"L1"
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"BNS": 9.803085668296649e-16,
"NSBH": 7.070935249680965e-14,
"Terrestrial": 0.8950225397718727
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"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-24T05:04:02Z",
"superevent_id": "S230824y",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T05:04:03.101876Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T05:04:03.101896Z",
"modified": "2023-08-24T05:04:03.109944Z"
}
},
{
"id": 1364,
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