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{
"id": 1502,
"topic": "gcn.circular",
"uuid": "88cf63cf-7487-4914-8d3f-a7c963196005",
"title": "LIGO/Virgo/KAGRA S230723ac: Updated Sky localization",
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"data": {
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"from": "Soichiro Morisaki at U. of Tokyo <soichiro.morisaki@ligo.org>",
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"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory\n(H1) and LIGO Livingston Observatory (L1) data around the time of the\ncompact binary merger (CBC) candidate S230723ac (GCN Circular 34235). Parameter estimation has been\nperformed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0,\ndistributed via GCN Notice, is available for retrieval from the\nGraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230723ac\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is\n1117 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 1551 +/- 436 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\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwMTY1MzQ0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.yElZrquEqCF3lRobKaYGqKcwVg-xfBV-554yuyanSjA\n\n",
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"subject": "LIGO/Virgo/KAGRA S230723ac: 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 S230723ac during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-23 10:18:34.451 UTC (GPS\ntime: 1374142732.451). The candidate was found by the, GstLAL\n[1], MBTA [2], and SPIIR [3] analysis pipelines.\n\n\nS230723ac is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 5.3e-08 Hz, or about one in 7\nmonths. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230723ac\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (87%), Terrestrial (13%), NSBH (<1%), or BNS\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%. [4] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [4] 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 [5], distributed via GCN notice about 25 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [5], 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\n1281 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 1686 +/- 515 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\n [1] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [2] Aubin et al. CQG 38, 095004 (2021)\n [3] Chu et al. PRD 105, 024023 (2022)\n [4] Chatterjee et al. ApJ 896, 54 (2020)\n [5] 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwMTEzMzMzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.LKH3Iw4ESrRVt3AwCahIjIbMa0SlD-8alK78Z2koq0Q\n\n",
"published": "2023-07-23T11:55:37.640670Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-23T11:55:37.640688Z",
"modified": "2023-07-23T11:55:37.646539Z",
"targets": []
}
]
},
{
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"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"L1"
],
"significant": true,
"skymap_hash": "0adca293d2175c2d095c85f21127595d",
"classification": {
"BBH": 0.9999998589269592,
"BNS": 3.8818043107879957e-25,
"NSBH": 3.038812522528842e-23,
"Terrestrial": 1.4107304080468452e-07
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-07-26T01:22:42Z",
"superevent_id": "S230726a",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-26T01:22:44.174488Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-26T01:22:44.174508Z",
"modified": "2023-07-26T01:22:44.180911Z"
}
},
{
"id": 871,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 1580,
"topic": "igwn.gwalert",
"uuid": "a9f3cee3-a225-4376-9bf1-648fd74c1838",
"title": "S230726a - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230726a/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230726a/view/"
},
"event": {
"far": 3.832054318795527e-14,
"time": "2023-07-26T00:29:40.060Z",
"group": "CBC",
"search": "AllSky",
"area_50": 10424.027073522693,
"area_90": 27773.905307327936,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"L1"
],
"significant": true,
"skymap_hash": "6a46ea0df8a864a54794805884d3fc7f",
"classification": {
"BBH": 0.9999998589269592,
"BNS": 3.8818043107879957e-25,
"NSBH": 3.038812522528842e-23,
"Terrestrial": 1.4107304080468452e-07
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-07-26T17:17:32Z",
"superevent_id": "S230726a",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-26T17:17:33.002656Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-26T17:17:33.002707Z",
"modified": "2023-07-26T17:17:33.031182Z"
}
}
],
"references": [
{
"id": 1581,
"topic": "gcn.circular",
"uuid": "ddc8938a-202e-43a1-9bfb-3882b70545e8",
"title": "LIGO/Virgo/KAGRA S230726a: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "naresh.adhikari@ligo.org",
"data": {
"date": "23/07/26 17:22:24 GMT",
"from": "naresh.adhikari@ligo.org",
"title": "GCN CIRCULAR",
"number": "34270",
"subject": "LIGO/Virgo/KAGRA S230726a: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Livingston Observatory\n(L1) data around the time of the compact binary merger (CBC) candidate\nS230726a (GCN Circular 34264).\nParameter estimation has been performed using Bilby [1] and a new sky\nmap, Bilby.multiorder.fits,0, distributed via GCN Notice, is available\nfor retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230726a\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is\n27774 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 2132 +/- 714 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\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwMzkyMTUwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.uvu8uqRFFMGX1Gfx-lBQ0uVOKT29hfKLeRRvhpP4jOo\n\n",
"published": "2023-07-26T17:22:35.879962Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-26T17:22:35.879989Z",
"modified": "2023-07-26T17:22:35.886192Z",
"targets": []
},
{
"id": 1558,
"topic": "gcn.circular",
"uuid": "e5fa987d-5a48-4674-9606-4a0aaae788c4",
"title": "LIGO/Virgo/KAGRA S230726a: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Andy C <andy.c.80297@gmail.com>",
"data": {
"date": "23/07/26 01:38:51 GMT",
"from": "Andy C <andy.c.80297@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34264",
"subject": "LIGO/Virgo/KAGRA S230726a: 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 S230726a during\nreal-time processing of data from LIGO Livingston Observatory (L1) at\n2023-07-26 00:29:40.060 UTC (GPS time: 1374366598.060). The candidate\nwas found by the GstLAL [1] analysis pipeline.\n\nS230726a is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3.8e-14 Hz, or about one in 1e6\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230726a\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS\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%. [2] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [2] 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 [3], distributed via GCN notice about 30 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [3], 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\n24219 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 2077 +/- 699 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] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n [3] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwMzM1NTM2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.A93yLots8-DUhsfWaU4He85YT3_HIx9k7TkTuKe4J6k\n\n",
"published": "2023-07-26T01:39:02.153461Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-26T01:39:02.153478Z",
"modified": "2023-07-26T01:39:02.161513Z",
"targets": []
}
]
},
{
"event_id": "S230726b",
"sequences": [
{
"id": 852,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1555,
"topic": "igwn.gwalert",
"uuid": "b56a35c2-41a4-454e-a9a0-ea59e4c24599",
"title": "S230726b - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230726b/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230726b/view/"
},
"event": {
"far": 2.875145128200529e-06,
"time": "2023-07-26T01:15:07.790Z",
"group": "CBC",
"search": "AllSky",
"area_50": 390.48136843449544,
"area_90": 3375.6390410393133,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 0.32685759270869064,
"HasMassGap": 0.25437784261392393,
"HasRemnant": 0.0
},
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"L1"
],
"significant": false,
"skymap_hash": "a328baea17425a3c0c8f823c3b48c46d",
"classification": {
"BBH": 0.2915235893883321,
"BNS": 0.0,
"NSBH": 0.013677308150390075,
"Terrestrial": 0.6947991024612779
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-26T01:15:31Z",
"superevent_id": "S230726b",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-26T01:15:32.389962Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-26T01:15:32.389981Z",
"modified": "2023-07-26T01:15:32.398114Z"
}
},
{
"id": 853,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1556,
"topic": "igwn.gwalert",
"uuid": "fda73e65-a9f5-4d8c-8668-87d702443ec9",
"title": "S230726b - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230726b/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230726b/view/"
},
"event": {
"far": 2.875145128200529e-06,
"time": "2023-07-26T01:15:07.790Z",
"group": "CBC",
"search": "AllSky",
"area_50": 390.48136843449544,
"area_90": 3375.6390410393133,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 0.32685759270869064,
"HasMassGap": 0.25437784261392393,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "a328baea17425a3c0c8f823c3b48c46d",
"classification": {
"BBH": 0.2915235893883321,
"BNS": 0.0,
"NSBH": 0.013677308150390075,
"Terrestrial": 0.6947991024612779
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-07-26T01:20:05Z",
"superevent_id": "S230726b",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-26T01:20:06.939631Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-26T01:20:06.939660Z",
"modified": "2023-07-26T01:20:06.945967Z"
}
}
],
"references": [
{
"id": 1568,
"topic": "gcn.circular",
"uuid": "43a94e36-4865-4a10-8ef8-1091aeab9238",
"title": "LIGO/Virgo/KAGRA S230726b: one counterpart neutrino candidate from IceCube neutrino searches",
"submitter": "Hop gcn.circular",
"authors": "acz2122@columbia.edu",
"data": {
"date": "23/07/26 04:36:27 GMT",
"from": "acz2122@columbia.edu",
"title": "GCN CIRCULAR",
"number": "34266",
"subject": "LIGO/Virgo/KAGRA S230726b: one counterpart neutrino candidate from IceCube neutrino searches"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nA search for track-like muon neutrino events detected by IceCube consistent with the sky\nlocalization of the low-significance gravitational wave candidate S230726b in a time range of 1000 seconds\ncentered on the alert event time (2023-07-26 01:06:47 UTC to 2023-07-26 01:23:27 UTC)\nhas been performed [1,2]. During this time period IceCube was collecting good quality data.\nOne hypothesis test was conducted for this low-significance gravitational wave event. The\nsearch uses a Bayesian approach to quantify the joint GW + neutrino event significance, which\nassumes a binary merger scenario and accounts for known astrophysical priors, such as GW source\ndistance, in the significance estimate [3].\n\nOne track-like event is found in spatial and temporal coincidence with the gravitational-wave\ncandidate S230726b calculated from the map circulated by LVK as S230726b-2-Preliminary. This\nrepresents an overall pre-trial p-value of 0.0089 for the Bayesian search.\n\nThe reported p-value here does not account for any trials correction (multiple hypotheses testing). The false alarm rate of these coincidences can be obtained by multiplying the p-values with their corresponding GW trigger rates. Further details are available at https://gcn.nasa.gov/missions/icecube.\n\nProperties of the coincident event(s) are shown below.\n\ndt(s)\tRA(deg)\t\tDec(deg)\tAngular uncertainty(deg) p-value(generic transient) p-value(Bayesian)\n-----------------------------------------------------------------------------------------------------\n80.15 131.82 \t1.68 \t1.889 \t\tnot applicable \t0.0098\n...\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 \trepresenting 90% CL containment by area.\np-value = the p-value for this specific track event from each 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\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\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwMzQ2MTkzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.f-jgVhdOasHfyeQtvwr9qyIa-BJT3ic4LmQG3Mb7ofs\n\n",
"published": "2023-07-26T04:36:40.354325Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-26T04:36:40.354350Z",
"modified": "2023-07-26T04:36:40.367153Z",
"targets": []
}
]
},
{
"event_id": "S230726f",
"sequences": [
{
"id": 855,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1560,
"topic": "igwn.gwalert",
"uuid": "e3265689-5060-4cba-b309-8c08db655281",
"title": "S230726f - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230726f/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230726f/view/"
},
"event": {
"far": 2.038079406376086e-05,
"time": "2023-07-26T01:53:41.483Z",
"group": "CBC",
"search": "AllSky",
"area_50": 811.5969549191985,
"area_90": 3069.296860537238,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.007345713506882921,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "3cdee355d3916c82b469629966a83b66",
"classification": {
"BBH": 0.06980420322145638,
"BNS": 5.290337438441645e-15,
"NSBH": 3.7636895836411496e-13,
"Terrestrial": 0.930195796778162
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-26T01:54:03Z",
"superevent_id": "S230726f",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-26T01:54:05.618515Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-26T01:54:05.618543Z",
"modified": "2023-07-26T01:54:05.625687Z"
}
},
{
"id": 856,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1561,
"topic": "igwn.gwalert",
"uuid": "5cbfffeb-592e-40db-b1e6-44817c5fd0f0",
"title": "S230726f - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230726f/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230726f/view/"
},
"event": {
"far": 2.038079406376086e-05,
"time": "2023-07-26T01:53:41.483Z",
"group": "CBC",
"search": "AllSky",
"area_50": 811.5969549191985,
"area_90": 3069.296860537238,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.007345713506882921,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "3cdee355d3916c82b469629966a83b66",
"classification": {
"BBH": 0.06980420322145638,
"BNS": 5.290337438441645e-15,
"NSBH": 3.7636895836411496e-13,
"Terrestrial": 0.930195796778162
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-07-26T01:58:40Z",
"superevent_id": "S230726f",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-26T01:58:41.352921Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-26T01:58:41.352950Z",
"modified": "2023-07-26T01:58:41.359426Z"
}
}
],
"references": []
},
{
"event_id": "S230726k",
"sequences": [
{
"id": 857,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1562,
"topic": "igwn.gwalert",
"uuid": "b9b8bf8b-c78e-4d5c-ad0a-dc72a8a58dba",
"title": "S230726k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230726k/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230726k/view/"
},
"event": {
"far": 1.789593443390913e-05,
"time": "2023-07-26T02:28:26.964Z",
"group": "CBC",
"search": "AllSky",
"area_50": 2402.05841259436,
"area_90": 8006.861375314535,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 7.094344529165021e-05,
"HasMassGap": 0.4542341525588239,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "d60e3824d7a065adfa44dc1e5cf8552e",
"classification": {
"BBH": 0.1847159480053646,
"BNS": 0.0,
"NSBH": 0.0014382043980931708,
"Terrestrial": 0.8138458475965422
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-26T02:28:50Z",
"superevent_id": "S230726k",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-26T02:28:51.263877Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-26T02:28:51.263899Z",
"modified": "2023-07-26T02:28:51.271078Z"
}
},
{
"id": 858,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1563,
"topic": "igwn.gwalert",
"uuid": "67fe1dd5-68e8-4e97-b9da-8bbad838114a",
"title": "S230726k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
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"message": {
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"uuid": "7b82dc7e-8ebe-4aa5-8fb8-efaa44eb754c",
"title": "S230729y - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 2,
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"published": "2023-07-29T08:28:25.922958Z",
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"created": "2023-07-29T08:28:25.922978Z",
"modified": "2023-07-29T08:28:25.927093Z"
}
}
],
"references": []
},
{
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"message": {
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"authors": "LVK",
"data": {
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"sequence_num": 1,
"time_created": "2023-07-29T08:23:53Z",
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"modified": "2023-07-29T08:23:55.147951Z"
}
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"topic": "igwn.gwalert",
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"title": "S230729z - PRELIMINARY",
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"authors": "LVK",
"data": {
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"sequence_num": 2,
"time_created": "2023-07-29T08:28:30Z",
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},
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"published": "2023-07-29T08:28:30.972821Z",
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"retracted": false,
"created": "2023-07-29T08:28:30.972840Z",
"modified": "2023-07-29T08:28:30.977084Z"
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{
"id": 902,
"sequence_number": 3,
"sequence_type": "INITIAL",
"message": {
"id": 1631,
"topic": "igwn.gwalert",
"uuid": "e6bd92de-2ff1-43c7-9956-ea3e24efc798",
"title": "S230729z - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-07-29T11:07:43Z",
"superevent_id": "S230729z",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-29T11:07:44.768140Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-29T11:07:44.768170Z",
"modified": "2023-07-29T11:07:44.771982Z"
}
},
{
"id": 957,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 1695,
"topic": "igwn.gwalert",
"uuid": "cb43ed26-d7e3-4cb5-b0f1-364b6f826cc9",
"title": "S230729z - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230729z/view/"
},
"event": {
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"time": "2023-07-29T08:23:17.201Z",
"group": "CBC",
"search": "AllSky",
"area_50": 611.635243947638,
"area_90": 1944.6433759542738,
"duration": null,
"pipeline": "gstlal",
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"HasRemnant": 0.0
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"significant": true,
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},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-07-31T19:32:03Z",
"superevent_id": "S230729z",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-31T19:32:04.626068Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-31T19:32:04.626089Z",
"modified": "2023-07-31T19:32:04.633542Z"
}
}
],
"references": [
{
"id": 1697,
"topic": "gcn.circular",
"uuid": "74ed23be-8f46-4cbe-b8d4-fb6c7c4ebc99",
"title": "LIGO/Virgo/KAGRA S230729z: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Christopher P L Berry at LVK Collaboration <christopher.berry@ligo.org>",
"data": {
"date": "23/07/31 19:51:04 GMT",
"from": "Christopher P L Berry at LVK Collaboration <christopher.berry@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34302",
"subject": "LIGO/Virgo/KAGRA S230729z: 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 S230729z (GCN Circular 34293). 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\nGraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230729z\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1945 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1495 +/- 444 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODMzMDcwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.HsMeeJyj3s_h3f5hf7-KM59aNn_VZAtn3bXXozC1V0I\n\n",
"published": "2023-07-31T19:51:15.820188Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-31T19:51:15.820205Z",
"modified": "2023-07-31T19:51:15.826333Z",
"targets": []
},
{
"id": 1632,
"topic": "gcn.circular",
"uuid": "b14295a4-0030-48aa-8702-696c0649082c",
"title": "LIGO/Virgo/KAGRA S230729z: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Angélique Lartaux at IJCLab <angelique.lartaux@ijclab.in2p3.fr>",
"data": {
"date": "23/07/29 11:17:18 GMT",
"from": "Angélique Lartaux at IJCLab <angelique.lartaux@ijclab.in2p3.fr>",
"title": "GCN CIRCULAR",
"number": "34293",
"subject": "LIGO/Virgo/KAGRA S230729z: 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 S230729z during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-29 08:23:17.201 UTC (GPS\ntime: 1374654215.201). The candidate was found by the GstLAL\n[1], MBTA [2], and PyCBC Live [3] analysis pipelines.\n\nS230729z is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3.4e-09 Hz, or about one in 9\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230729z\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS\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%. [4] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [4] 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 6%.\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 [5], distributed via GCN notice about 35 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [5], 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\n1428 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 1546 +/- 472 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] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [2] Aubin et al. CQG 38, 095004 (2021)\n [3] Dal Canton et al. ApJ 923, 254 (2021)\n [4] Chatterjee et al. ApJ 896, 54 (2020)\n [5] 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNjI5NDQ0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.LYSft8Hz4luqryduOt_fU6wMWRpmCosnC3tdwzbKYMM\n\n",
"published": "2023-07-29T11:17:31.552325Z",
"message_parser": "GCN Circular Parser v1",
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"time": "2023-07-31T21:43:05.388Z",
"group": "CBC",
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"area_50": 429.50852293681476,
"area_90": 1587.1042830943168,
"duration": null,
"pipeline": "MBTA",
"properties": {
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"HasMassGap": 0.006068376068376069,
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},
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],
"significant": false,
"skymap_hash": "5b970646228ae781dc2261dbb16943b2",
"classification": {
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"BNS": 0.001325529,
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},
"skymap_version": 0,
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-07-31T21:48:12Z",
"superevent_id": "S230731al",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-31T21:48:15.343461Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-31T21:48:15.343482Z",
"modified": "2023-07-31T21:48:15.349805Z"
}
}
],
"references": []
},
{
"event_id": "S230731an",
"sequences": [
{
"id": 960,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1700,
"topic": "igwn.gwalert",
"uuid": "d43db824-7779-432c-a839-459d3b141378",
"title": "S230731an - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230731an/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230731an/view/"
},
"event": {
"far": 4.571287005064243e-27,
"time": "2023-07-31T21:53:07.888Z",
"group": "CBC",
"search": "AllSky",
"area_50": 196.76190394919294,
"area_90": 694.9351382348462,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.12463847974647461,
"HasRemnant": 0.0
},
"instruments": [
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],
"significant": true,
"skymap_hash": "f5be5ccb722946c914303002a869bd1a",
"classification": {
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"BNS": 2.982154796455988e-32,
"NSBH": 0.00047197462737353816,
"Terrestrial": 1.1102230246251565e-16
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-31T21:53:38Z",
"superevent_id": "S230731an",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-31T21:53:40.068185Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-31T21:53:40.068206Z",
"modified": "2023-07-31T21:53:40.075115Z"
}
},
{
"id": 961,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1701,
"topic": "igwn.gwalert",
"uuid": "10a65d43-a59b-4257-b5c1-16680bbd0492",
"title": "S230731an - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230731an/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230731an/view/"
},
"event": {
"far": 3.167545842243851e-10,
"time": "2023-07-31T21:53:07.889Z",
"group": "CBC",
"search": "AllSky",
"area_50": 190.62456916858628,
"area_90": 645.836459989993,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.052964740814740806,
"HasRemnant": 0.0
},
"instruments": [
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],
"significant": true,
"skymap_hash": "0ed8007d53d2723da220c5430e31fad2",
"classification": {
"BBH": 0.8139519908482554,
"BNS": 0.0,
"NSBH": 0.1838623882504885,
"Terrestrial": 0.002185620901256069
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-07-31T21:58:16Z",
"superevent_id": "S230731an",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-31T21:58:18.478739Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-31T21:58:18.478762Z",
"modified": "2023-07-31T21:58:18.484946Z"
}
},
{
"id": 962,
"sequence_number": 3,
"sequence_type": "INITIAL",
"message": {
"id": 1702,
"topic": "igwn.gwalert",
"uuid": "c88dc1cf-ed11-4235-8d4a-2f4cf7bcfd92",
"title": "S230731an - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230731an/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230731an/view/"
},
"event": {
"far": 3.167545842243851e-10,
"time": "2023-07-31T21:53:07.889Z",
"group": "CBC",
"search": "AllSky",
"area_50": 190.62456916858628,
"area_90": 645.836459989993,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.052964740814740806,
"HasRemnant": 0.0
},
"instruments": [
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],
"significant": true,
"skymap_hash": "0ed8007d53d2723da220c5430e31fad2",
"classification": {
"BBH": 0.8139519908482554,
"BNS": 0.0,
"NSBH": 0.1838623882504885,
"Terrestrial": 0.002185620901256069
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-07-31T22:13:35Z",
"superevent_id": "S230731an",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-31T22:13:37.478037Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-31T22:13:37.478059Z",
"modified": "2023-07-31T22:13:37.486170Z"
}
},
{
"id": 965,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 1708,
"topic": "igwn.gwalert",
"uuid": "2ab03548-405a-4bbb-8f7d-fd9f896706bf",
"title": "S230731an - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230731an/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S230731an/view/"
},
"event": {
"far": 3.167545842243851e-10,
"time": "2023-07-31T21:53:07.889Z",
"group": "CBC",
"search": "AllSky",
"area_50": 170.16678656656407,
"area_90": 598.4163690355621,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.002927927927927928,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": true,
"skymap_hash": "fbbe34475099a70ca4e356a28bf5737d",
"classification": {
"BBH": 0.8139519908482554,
"BNS": 0.0,
"NSBH": 0.1838623882504885,
"Terrestrial": 0.002185620901256069
},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-08-01T00:58:04Z",
"superevent_id": "S230731an",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-01T00:58:06.255957Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-01T00:58:06.255977Z",
"modified": "2023-08-01T00:58:06.263650Z"
}
}
],
"references": []
},
{
"event_id": "S230731a",
"sequences": [],
"references": [
{
"id": 1753,
"topic": "gcn.circular",
"uuid": "f434b956-1257-4767-a33e-356196661330",
"title": "LIGO/Virgo/KAGRA S230731an: Upper limits from Swift/BAT-GUANO",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/08/02 02:20:05 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34310",
"subject": "LIGO/Virgo/KAGRA S230731an: Upper limits from Swift/BAT-GUANO"
},
"message_text": "Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), James DeLaunay (U Alabama), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT was observing 64.47 % of the GW localization probability (bayestar.multiorder.fits) at merger time. A fraction 5.72 % 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^-7 erg/s/cm^2:\n\ntime_bin (s) soft normal hard GRB170817\n-------------------------------\n0.256 22.8 15.3 13.6 17.1\n1.024 11.6 7.8 6.9 8.7\n4.096 6.2 4.2 3.7 4.6\n16.384 3.8 2.6 2.3 2.9\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.8206758\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.8206771\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTQyODEwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ThPAUTIe6mbowNBb7K5zgSINQ61RPEb8_8wiMSvsBFk\n\n",
"published": "2023-08-02T02:20:16.502037Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T02:20:16.502054Z",
"modified": "2023-08-02T02:20:16.509006Z",
"targets": []
},
{
"id": 1716,
"topic": "gcn.circular",
"uuid": "30f40547-7753-40a6-a225-0908ff2ad81a",
"title": "LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/01 06:45:02 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34308",
"subject": "LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits"
},
"message_text": "G. Waratkar (IITB), V. Bhalerao (IITB), M. Dixit (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 out a search for X-ray candidates in Astrosat CZTI data in a 100-sec window around the trigger time of the event S230731an (UTC 2023-07-31 21:53:07, GraceDB event). We use the Bilby.multiorder.fits,0 map (https://gracedb.ligo.org/api/superevents/S230731an/files/Bilby.multiorder.fits,0) for our analysis. CZTI is a coded aperture mask instrument that has a 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 = 00:47:41.1, 85:07:31.0 (11.9212,85.1253), which is ~60 deg away from the maximum probability location. At the time of the merger event, the Earth-satellite-transient angle corresponding to the maximum probability location is ~87 deg and hence is not occulted by Earth in the satellite's frame. In a time interval of 100 sec around the event, the region of the localization map which is not occulted by Earth in the satellite's frame has a total probability of 0.93 (93%) of containing the source.\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 modeled 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\n0.1 s: flux limit= 1.18e-05 ergs/cm^2/s; fluence limit = 1.18e-06 ergs/cm^2\n1.0 s: flux limit= 2.30e-06 ergs/cm^2/s; fluence limit = 2.30e-06 ergs/cm^2\n10.0 s: flux limit= 2.74e-07 ergs/cm^2/s; fluence limit = 2.74e-06 ergs/cm^2\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 GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=emgw\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODcyMzA3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.rmCjILKDGQema86iob27KFLHM6FrO0wHbmKspla7L00\n\n",
"published": "2023-08-01T06:45:16.752211Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-01T06:45:16.752229Z",
"modified": "2023-08-01T06:45:16.758637Z",
"targets": []
},
{
"id": 1714,
"topic": "gcn.circular",
"uuid": "62e4cf00-06f1-424c-b795-19f4bf9324d3",
"title": "LIGO/Virgo/KAGRA S230731an: not observable by Fermi-GBM",
"submitter": "Hop gcn.circular",
"authors": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"data": {
"date": "23/08/01 02:03:51 GMT",
"from": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"title": "GCN CIRCULAR",
"number": "34307",
"subject": "LIGO/Virgo/KAGRA S230731an: not observable by Fermi-GBM"
},
"message_text": "S. Dalessi (UAH) reports on behalf of the Fermi-GBM Team:\n\nAt the time of LVK S230731an, Fermi was passing through the South Atlantic Anomaly from 12.6 minutes prior to 5.7 minutes after the trigger time; therefore the GBM detectors were disabled.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODU1NDM2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.abx7FeUOsoK7vvFXdyPzzGmcHZZb54S1eXjjHVggXUU\n\n",
"published": "2023-08-01T02:04:02.153974Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-01T02:04:02.153994Z",
"modified": "2023-08-01T02:04:02.161932Z",
"targets": []
},
{
"id": 1709,
"topic": "gcn.circular",
"uuid": "9965bee8-0cf2-470c-8497-44e684a8f38a",
"title": "LIGO/Virgo/KAGRA S230731an: Updated Sky Localization and EM Bright Classification, and Correction to Source Classification",
"submitter": "Hop gcn.circular",
"authors": "carl.haster@unlv.edu",
"data": {
"date": "23/08/01 01:24:15 GMT",
"from": "carl.haster@unlv.edu",
"title": "GCN CIRCULAR",
"number": "34306",
"subject": "LIGO/Virgo/KAGRA S230731an: Updated Sky Localization and EM Bright Classification, and Correction to Source Classification"
},
"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 S230731an (GCN Circular 34303). 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/S230731an\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S230731an 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\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 599 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1001 +/- 242 Mpc (a posteriori mean +/- standard deviation).\n\nThe GCN Circular 34303 quoted incorrect values for the classification of the GW signal. These differ from the correct values found in the Initial Notice. The correct values from the Initial Notice are: BBH (81%), NSBH (18%), Terrestrial (<1%), or BNS (0%).\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 [2] Chatterjee et al. ApJ 896, 54 (2020)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODUzMDYxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.TRKmOp2xrLMY5fMhIoYawFinihrPDRZv53AeCr-CzJ8\n\n",
"published": "2023-08-01T01:24:26.525932Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-01T01:24:26.525950Z",
"modified": "2023-08-01T01:24:26.534031Z",
"targets": []
},
{
"id": 1706,
"topic": "gcn.circular",
"uuid": "004b23f8-6b0c-4488-83ba-61c92852e27a",
"title": "LIGO/Virgo/KAGRA S230731an: Coverage and upper limits from MAXI/GSC observations",
"submitter": "Hop gcn.circular",
"authors": "Satoshi Sugita at Aoyama Gakuin U. <sugita@phys.aoyama.ac.jp>",
"data": {
"date": "23/07/31 23:47:05 GMT",
"from": "Satoshi Sugita at Aoyama Gakuin U. <sugita@phys.aoyama.ac.jp>",
"title": "GCN CIRCULAR",
"number": "34304",
"subject": "LIGO/Virgo/KAGRA S230731an: Coverage and upper limits from MAXI/GSC observations"
},
"message_text": "M. Nakajima, H. Negoro, (Nihon U.),\nT. Mihara, N. Kawai (RIKEN),\nS. Sugita, M. Serino, H. Hiramatsu, H. Nishikawa, Y. Kondo (AGU),\nY. Kawakubo (LSU)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter compact binary merger candidate S230731an at 2023-07-31 21:53:07\nUTC (GCN 34303).\n\nAt the trigger time of S230731an, the high-voltage of MAXI/GSC was off,\nand it was turned on at T0+628 sec (+10.5 min).\nThe first one-orbit (92 min) scan observation with GSC after the event\ncovered 95%\nof the 90% credible region of the bayestar skymap from 22:03:35 to\n23:07:43 UTC (T0+628 to T0+4476 sec).\n\nNo significant new source was found in the region in the one-orbit\nscan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODQ3MjMxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.2XC1V5mgX84oDco_6L3Ypmxd71ljdygnnmTuzfqOPRI\n\n",
"published": "2023-07-31T23:47:16.044291Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-31T23:47:16.044318Z",
"modified": "2023-07-31T23:47:16.052954Z",
"targets": []
},
{
"id": 1703,
"topic": "gcn.circular",
"uuid": "0768a4a0-96ed-4b18-9140-f944ce6debba",
"title": "LIGO/Virgo/KAGRA S230731an: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "J. C. Driggers at California Institute of Technology, LIGO Hanford Observatory <jenne@caltech.edu>",
"data": {
"date": "23/07/31 22:22:25 GMT",
"from": "J. C. Driggers at California Institute of Technology, LIGO Hanford Observatory <jenne@caltech.edu>",
"title": "GCN CIRCULAR",
"number": "34303",
"subject": "LIGO/Virgo/KAGRA S230731an: 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 S230731an during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-31 21:53:07.889 UTC (GPS\ntime: 1374875605.889). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230731an is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3.2e-10 Hz, or about one in 1e2\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230731an\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (70%), NSBH (15%), Terrestrial (15%), or BNS\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%. [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 5%.\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 30 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 646\ndeg2. Marginalized over the whole sky, the a posteriori luminosity\ndistance estimate is 1056 +/- 279 Mpc (a posteriori mean +/- standard\ndeviation).\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] Aubin et al. CQG 38, 095004 (2021)\n [3] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\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---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwODQyMTUwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.-Hjcf58CxPOGn5Md5q6m1YAUvSOiDwsvRwJ3kz_VJOE\n\n",
"published": "2023-07-31T22:22:35.423033Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-31T22:22:35.423049Z",
"modified": "2023-07-31T22:22:35.429419Z",
"targets": []
}
]
},
{
"event_id": "S230731at",
"sequences": [
{
"id": 963,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1704,
"topic": "igwn.gwalert",
"uuid": "7b22bf56-52ce-43a0-b453-8f697863af78",
"title": "S230731at - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230731at/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230731at/view/"
},
"event": {
"far": 1.50667485532171e-05,
"time": "2023-07-31T22:49:19.315Z",
"group": "CBC",
"search": "AllSky",
"area_50": 436.4851513626325,
"area_90": 1976.5365344722982,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.7235932199831788,
"HasRemnant": 0.003303584433583724
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "943ddc12c47c7cae9deaafc111af3b52",
"classification": {
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"BNS": 0.000629794632047586,
"NSBH": 0.0008186365117828219,
"Terrestrial": 0.9985515688561696
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-31T22:49:55Z",
"superevent_id": "S230731at",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-31T22:49:57.595839Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-31T22:49:57.595861Z",
"modified": "2023-07-31T22:49:57.604227Z"
}
},
{
"id": 964,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1705,
"topic": "igwn.gwalert",
"uuid": "be3dc109-9023-4fab-be7c-3c91deaf86dd",
"title": "S230731at - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230731at/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230731at/view/"
},
"event": {
"far": 1.50667485532171e-05,
"time": "2023-07-31T22:49:19.315Z",
"group": "CBC",
"search": "AllSky",
"area_50": 436.4851513626325,
"area_90": 1976.5365344722982,
"duration": null,
"pipeline": "pycbc",
"properties": {
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"HasMassGap": 0.7235932199831788,
"HasRemnant": 0.003303584433583724
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"instruments": [
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"significant": false,
"skymap_hash": "943ddc12c47c7cae9deaafc111af3b52",
"classification": {
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"BNS": 0.000629794632047586,
"NSBH": 0.0008186365117828219,
"Terrestrial": 0.9985515688561696
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-07-31T22:54:35Z",
"superevent_id": "S230731at",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-31T22:54:37.227316Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-31T22:54:37.227338Z",
"modified": "2023-07-31T22:54:37.233714Z"
}
}
],
"references": []
},
{
"event_id": "S230801h",
"sequences": [
{
"id": 966,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1710,
"topic": "igwn.gwalert",
"uuid": "e25067ee-6370-4c12-ba60-8d5f3364ceb6",
"title": "S230801h - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230801h/view/"
},
"event": {
"far": 1.745817e-05,
"time": "2023-08-01T01:41:02.072Z",
"group": "CBC",
"search": "AllSky",
"area_50": 596.1083115112315,
"area_90": 2436.4694520480175,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.09443593613618687,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f443e832086d8553055fd5ef7fe9628c",
"classification": {
"BBH": 0.0291975,
"BNS": 0.0,
"NSBH": 1.31e-06,
"Terrestrial": 0.970801189
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-01T01:41:36Z",
"superevent_id": "S230801h",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-01T01:41:36.676973Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-01T01:41:36.676992Z",
"modified": "2023-08-01T01:41:36.684789Z"
}
},
{
"id": 968,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1712,
"topic": "igwn.gwalert",
"uuid": "24cc8938-1b3f-4138-8690-a5943e693bc3",
"title": "S230801h - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230801h/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230801h/view/"
},
"event": {
"far": 1.15504559137422e-05,
"time": "2023-08-01T01:41:02.087Z",
"group": "CBC",
"search": "AllSky",
"area_50": 661.7830392490051,
"area_90": 2581.6672526695493,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.1149859971862479,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "dad816852aa4936d67fbfa5cc8e78b28",
"classification": {
"BBH": 0.21143964120112815,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.7885603587988719
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-01T01:46:11Z",
"superevent_id": "S230801h",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-01T01:46:12.400721Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-01T01:46:12.400743Z",
"modified": "2023-08-01T01:46:12.407005Z"
}
}
],
"references": []
},
{
"event_id": "S230801i",
"sequences": [
{
"id": 967,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1711,
"topic": "igwn.gwalert",
"uuid": "8bd0197d-bb70-4c68-8c0a-42515ce0e86a",
"title": "S230801i - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230801i/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230801i/view/"
},
"event": {
"far": 2.956904043734635e-06,
"time": "2023-08-01T01:41:33.335Z",
"group": "CBC",
"search": "AllSky",
"area_50": 381.354050042824,
"area_90": 1408.7543834869437,
"duration": null,
"pipeline": "pycbc",
"properties": {
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"HasMassGap": 0.2011642867388762,
"HasRemnant": 0.0
},
"instruments": [
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],
"significant": false,
"skymap_hash": "2b411933194b9cb545777c4d3fa77bd7",
"classification": {
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"BNS": 0.0,
"NSBH": 0.060917385992370336,
"Terrestrial": 0.8546200642464343
},
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},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-01T01:42:02Z",
"superevent_id": "S230801i",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-01T01:42:03.757299Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-01T01:42:03.757319Z",
"modified": "2023-08-01T01:42:03.763204Z"
}
},
{
"id": 969,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1713,
"topic": "igwn.gwalert",
"uuid": "0f411851-ff95-4508-8628-5c4d03ef3e43",
"title": "S230801i - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230801i/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230801i/view/"
},
"event": {
"far": 2.956904043734635e-06,
"time": "2023-08-01T01:41:33.335Z",
"group": "CBC",
"search": "AllSky",
"area_50": 381.354050042824,
"area_90": 1408.7543834869437,
"duration": null,
"pipeline": "pycbc",
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},
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"skymap_hash": "2b411933194b9cb545777c4d3fa77bd7",
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},
"skymap_version": 0,
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-01T01:46:37Z",
"superevent_id": "S230801i",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-01T01:46:38.523168Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-01T01:46:38.523188Z",
"modified": "2023-08-01T01:46:38.528955Z"
}
}
],
"references": []
},
{
"event_id": "S230801x",
"sequences": [
{
"id": 970,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1715,
"topic": "igwn.gwalert",
"uuid": "8b2ed01c-7135-44af-9fe5-9b05a0129d8d",
"title": "S230801x - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230801x/view/"
},
"event": {
"far": 1.63737e-05,
"time": "2023-08-01T06:39:41.832Z",
"group": "Burst",
"search": "BBH",
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"sequence_num": 1,
"time_created": "2023-08-01T06:41:23Z",
"superevent_id": "S230801x",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-01T06:41:24.065414Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-01T06:41:24.065437Z",
"modified": "2023-08-01T06:41:24.074783Z"
}
},
{
"id": 971,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1717,
"topic": "igwn.gwalert",
"uuid": "0d68dfc8-b947-4909-80d4-7a7aa72b08b5",
"title": "S230801x - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230801x/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230801x/view/"
},
"event": {
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"time": "2023-08-01T06:39:41.832Z",
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"sequence_num": 2,
"time_created": "2023-08-01T06:45:56Z",
"superevent_id": "S230801x",
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},
"message_text": "",
"published": "2023-08-01T06:45:57.877406Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-01T06:45:57.877429Z",
"modified": "2023-08-01T06:45:57.884053Z"
}
}
],
"references": []
},
{
"event_id": "S230801ab",
"sequences": [
{
"id": 972,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1719,
"topic": "igwn.gwalert",
"uuid": "fab320cc-b600-4861-b172-7cf304ed8e30",
"title": "S230801ab - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
"far": 2.140585797466747e-05,
"time": "2023-08-01T09:20:52.559Z",
"group": "CBC",
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},
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