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{
"id": 805,
"topic": "gcn.circular",
"uuid": "6c63fe07-0752-4532-befa-71f4db6250a9",
"title": "LIGO/Virgo/KAGRA low-significance gravitational wave candidate S230701z: one counterpart neutrino candidate from IceCube neutrino searches",
"submitter": "Hop gcn.circular",
"authors": "Erik Blaufuss at University of Maryland, College Park <blaufuss@umd.edu>",
"data": {
"date": "23/07/01 16:14:16 GMT",
"from": "Erik Blaufuss at University of Maryland, College Park <blaufuss@umd.edu>",
"title": "GCN CIRCULAR",
"number": "34129",
"subject": "LIGO/Virgo/KAGRA low-significance gravitational wave candidate S230701z: 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 S230701z in a time range of 1000 seconds\ncentered on the alert event time (2023-07-01 06:28:35 UTC to 2023-07-01 06:45:15 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 S230701z calculated from the map circulated by LVK as S230701z-2-Preliminary. This\nrepresents an overall pre-trial p-value of 0.0018 for the Bayesian search. The most probable multi-messenger source direction based on the neutrinos and GW skymap is RA 114.94, Dec 15.16 degrees.\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-----------------------------------------------------------------------------------------------------\n172.17 114.94 \t15.16 \t2.58 \t\tnull (not applicable) \t0.0018\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\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4MjI4MDYxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Ke9C2xg6PIroTUk3up-jPXiGCgbuKI5yt7bvX6liT2Q\n\n",
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{
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"title": "LIGO/Virgo/KAGRA S230702an: Updated Sky localization",
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"message_text": "We 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 S230702an (GCN Circular 34136). 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/S230702an\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 2267 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2428 +/- 849 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4NjYzNDgzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.NuSw41ukERfA7GQH24m80LxIEDyX93swKG2cPEWpK4U\n\n",
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"uuid": "961a3638-7c75-461f-8043-ec24924d1a21",
"title": "LIGO/Virgo/KAGRA S230702an: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "adrian.helmling-cornell@ligo.org",
"data": {
"date": "23/07/02 19:35:12 GMT",
"from": "adrian.helmling-cornell@ligo.org",
"title": "GCN CIRCULAR",
"number": "34136",
"subject": "LIGO/Virgo/KAGRA S230702an: 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 S230702an during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-02 18:54:53.738 UTC (GPS\ntime: 1372359311.738). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230702an is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.5e-12 Hz, or about one in 1e4\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230702an\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%. [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 21 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\n2519 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 2567 +/- 770 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] 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4MzI2NTE4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.jakWBxiJeWNKc7-dgE-WP7VvHfT2U3wGz-eE4TdiRqI\n\n",
"published": "2023-07-02T19:35:23.071834Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-02T19:35:23.071853Z",
"modified": "2023-07-02T19:35:23.078018Z",
"targets": []
}
]
},
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"uuid": "f51ce70f-2110-4c80-952b-945b1761a595",
"title": "S230704f - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230704f/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230704f/view/"
},
"event": {
"far": 2.815522679531743e-09,
"time": "2023-07-04T02:12:11.224Z",
"group": "CBC",
"search": "AllSky",
"area_50": 448.49754165971734,
"area_90": 1948.0005505351187,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
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],
"significant": true,
"skymap_hash": "eef2e4ffd413e8d31a690ecbd048e501",
"classification": {
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"BNS": 1.1904241311736438e-20,
"NSBH": 8.37264971934899e-19,
"Terrestrial": 0.0025508228359159
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-07-04T05:31:08Z",
"superevent_id": "S230704f",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-04T05:31:09.725484Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-04T05:31:09.725511Z",
"modified": "2023-07-04T05:31:09.733981Z"
}
},
{
"id": 467,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 949,
"topic": "igwn.gwalert",
"uuid": "a8ee6850-96a2-49fc-aca5-36bd344c506a",
"title": "S230704f - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230704f/view/"
},
"event": {
"far": 2.815522679531743e-09,
"time": "2023-07-04T02:12:11.224Z",
"group": "CBC",
"search": "AllSky",
"area_50": 434.96393163068734,
"area_90": 1699.5696315526131,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"HasMassGap": 0.0,
"HasRemnant": 0.0
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],
"significant": true,
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"BNS": 1.1904241311736438e-20,
"NSBH": 8.37264971934899e-19,
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},
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},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-07-06T19:00:49Z",
"superevent_id": "S230704f",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-06T19:00:49.606029Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-06T19:00:49.606053Z",
"modified": "2023-07-06T19:00:49.611762Z"
}
}
],
"references": [
{
"id": 950,
"topic": "gcn.circular",
"uuid": "62516189-04b1-4509-abac-6c892803cf8c",
"title": "LIGO/Virgo/KAGRA S230704f: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "jgolomb@caltech.edu",
"data": {
"date": "23/07/06 19:03:13 GMT",
"from": "jgolomb@caltech.edu",
"title": "GCN CIRCULAR",
"number": "34153",
"subject": "LIGO/Virgo/KAGRA S230704f: 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 S230704f (GCN Circular 34140). 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/S230704f\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1700 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2759 +/- 992 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4NjcwMTk5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.33wOe7aHN5fZRiwIe4yDycEWBpVZzFQF5MJIQAksuks\n\n",
"published": "2023-07-06T19:03:24.987019Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-06T19:03:24.987052Z",
"modified": "2023-07-06T19:03:24.992891Z",
"targets": []
},
{
"id": 871,
"topic": "gcn.circular",
"uuid": "361aecfc-468c-4590-a98f-d67b5445c8ee",
"title": "LIGO/Virgo/KAGRA S230704f: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "zhaozc@cau.edu.cn",
"data": {
"date": "23/07/04 05:41:18 GMT",
"from": "zhaozc@cau.edu.cn",
"title": "GCN CIRCULAR",
"number": "34140",
"subject": "LIGO/Virgo/KAGRA S230704f: 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 S230704f during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-04 02:12:11.224 UTC (GPS\ntime: 1372471949.224). The candidate was found by the CWB [1], MBTA\n[2], and GstLAL [3] analysis pipelines.\n\nS230704f is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 2.8e-09 Hz, or about one in 11\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230704f\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 <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 23 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\n1948 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 2965 +/- 978 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] 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] 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4NDQ5MjgzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.4i69FIkP7VV8jvNOZFOLDDyziaQXh4wTEvIIF_0hr0A\n\n",
"published": "2023-07-04T05:41:31.811401Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-04T05:41:31.811421Z",
"modified": "2023-07-04T05:41:31.817760Z",
"targets": []
}
]
},
{
"event_id": "S230704v",
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"message": {
"id": 872,
"topic": "igwn.gwalert",
"uuid": "193a93d3-d8d5-4530-95d0-2ac2b7a84304",
"title": "S230704v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"data": {
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"published": "2023-07-04T07:03:51.104908Z",
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"sequence_type": "PRELIMINARY",
"message": {
"id": 873,
"topic": "igwn.gwalert",
"uuid": "5423fe5d-49b2-4d20-939f-2af1d0cd7c6a",
"title": "S230704v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"superevent_id": "S230704v",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-04T07:08:23.675153Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-04T07:08:23.675195Z",
"modified": "2023-07-04T07:08:23.681668Z"
}
}
],
"references": []
},
{
"event_id": "S230704y",
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"message": {
"id": 874,
"topic": "igwn.gwalert",
"uuid": "0a3abb98-4f3d-429b-9149-00c6b62929f1",
"title": "S230704y - PRELIMINARY",
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"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230704y/view/"
},
"event": {
"far": 7.792219170914039e-06,
"time": "2023-07-04T08:08:14.765Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1448.6208316344744,
"area_90": 5144.030751499243,
"duration": null,
"pipeline": "gstlal",
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},
"instruments": [
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"significant": false,
"skymap_hash": "80b8eb813f7615876958d425c50edc93",
"classification": {
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"BNS": 2.5696395122474266e-15,
"NSBH": 1.7626935830075647e-10,
"Terrestrial": 0.7809965909244477
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"skymap_version": 0,
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},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-04T08:08:37Z",
"superevent_id": "S230704y",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-04T08:08:38.936598Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-04T08:08:38.936624Z",
"modified": "2023-07-04T08:08:38.943815Z"
}
},
{
"id": 410,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 875,
"topic": "igwn.gwalert",
"uuid": "970d5b4f-fa4d-45c6-a609-57480b1b38a1",
"title": "S230704y - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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},
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"time": "2023-07-04T08:08:14.765Z",
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"area_90": 5144.030751499243,
"duration": null,
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"BNS": 2.5696395122474266e-15,
"NSBH": 1.7626935830075647e-10,
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"sequence_num": 2,
"time_created": "2023-07-04T08:13:15Z",
"superevent_id": "S230704y",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-04T08:13:16.526922Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-04T08:13:16.526948Z",
"modified": "2023-07-04T08:13:16.533156Z"
}
}
],
"references": []
},
{
"event_id": "S230704ag",
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"message": {
"id": 876,
"topic": "igwn.gwalert",
"uuid": "4b21b56d-adec-48c0-8fc5-bf9ffa8199a1",
"title": "S230704ag - PRELIMINARY",
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"data": {
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"time": "2023-07-04T12:39:30.379Z",
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},
"message_text": "",
"published": "2023-07-04T12:40:41.634980Z",
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"retracted": false,
"created": "2023-07-04T12:40:41.635005Z",
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}
},
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"id": 412,
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"message": {
"id": 877,
"topic": "igwn.gwalert",
"uuid": "66be10a7-8719-49c1-87c2-5ce48461dd90",
"title": "S230704ag - PRELIMINARY",
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"authors": "LVK",
"data": {
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},
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"published": "2023-07-04T12:45:22.320260Z",
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"created": "2023-07-04T12:45:22.320303Z",
"modified": "2023-07-04T12:45:22.326490Z"
}
}
],
"references": []
},
{
"event_id": "S230704ah",
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"message": {
"id": 878,
"topic": "igwn.gwalert",
"uuid": "a745bcb5-9427-40c2-ac41-d0370246414d",
"title": "S230704ah - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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},
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"superevent_id": "S230704ah",
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},
"message_text": "",
"published": "2023-07-04T12:47:02.708739Z",
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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 S230706ah (GCN Circular ***CITE ORIGINAL GCN ID, e.g. 25012***). Parameter estimation has been performed 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/S230706ah\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is\n1497 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 1962 +/- 594 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4Njg4ODI2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.23wqYpDDopntbXAskeO7OZn9YHK_1D8krx-Sd_utSp4\n\n",
"published": "2023-07-07T00:13:51.766307Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-07T00:13:51.766341Z",
"modified": "2023-07-07T00:13:51.772192Z",
"targets": []
},
{
"id": 936,
"topic": "gcn.circular",
"uuid": "becf9c64-3cb3-4c02-ac5a-f9d48f681a64",
"title": "LIGO/Virgo/KAGRA S230706ah: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Nicolas Sanchis-Gual at University of Valencia <nicolas.sanchis-gual@ligo.org>",
"data": {
"date": "23/07/06 11:15:16 GMT",
"from": "Nicolas Sanchis-Gual at University of Valencia <nicolas.sanchis-gual@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34147",
"subject": "LIGO/Virgo/KAGRA S230706ah: 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 S230706ah during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-06 10:43:33.157 UTC (GPS\ntime: 1372675431.157). The candidate was found by the MBTA [1], GstLAL\n[2], PyCBC Live [3], and SPIIR [4] analysis pipelines.\n\nS230706ah is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 4.3e-08 Hz, or about one in 8\nmonths. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230706ah\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (97%), Terrestrial (3%), 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%. [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 4%.\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 24 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\n1553 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 2143 +/- 684 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] Aubin et al. CQG 38, 095004 (2021)\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---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4NjQyMTIyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.SITu2vnfoutyAbjV13SWC2aEyBxluyO73KtcTQQJlMI\n\n",
"published": "2023-07-06T11:15:27.345094Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-06T11:15:27.345126Z",
"modified": "2023-07-06T11:15:27.351588Z",
"targets": []
}
]
},
{
"event_id": "S230706al",
"sequences": [
{
"id": 460,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 937,
"topic": "igwn.gwalert",
"uuid": "b62e1382-eb7a-4621-9da3-14845a30cb58",
"title": "S230706al - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230706al/view/"
},
"event": {
"far": 1.9384231109143e-06,
"time": "2023-07-06T11:38:51.766Z",
"group": "CBC",
"search": "AllSky",
"area_50": 357.8013721240856,
"area_90": 1407.495443019127,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.6313811610877974,
"HasRemnant": 0.006977644260972064
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "9a9628806231aaa81c88471fa89c2e96",
"classification": {
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"BNS": 0.06696994819888105,
"NSBH": 0.19952988634388244,
"Terrestrial": 0.7335001654572365
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"skymap_version": 0,
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},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-06T11:39:26Z",
"superevent_id": "S230706al",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-06T11:39:27.684087Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-06T11:39:27.684110Z",
"modified": "2023-07-06T11:39:27.690080Z"
}
},
{
"id": 461,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 938,
"topic": "igwn.gwalert",
"uuid": "1b6b6616-ccb1-41bb-b34a-ed9ac27d30c4",
"title": "S230706al - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230706al/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230706al/view/"
},
"event": {
"far": 1.9384231109143e-06,
"time": "2023-07-06T11:38:51.766Z",
"group": "CBC",
"search": "AllSky",
"area_50": 357.8013721240856,
"area_90": 1407.495443019127,
"duration": null,
"pipeline": "spiir",
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"HasMassGap": 0.6313811610877974,
"HasRemnant": 0.006977644260972064
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"significant": false,
"skymap_hash": "9a9628806231aaa81c88471fa89c2e96",
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"NSBH": 0.19952988634388244,
"Terrestrial": 0.7335001654572365
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-07-06T11:44:01Z",
"superevent_id": "S230706al",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-06T11:44:02.449608Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-06T11:44:02.449632Z",
"modified": "2023-07-06T11:44:02.455304Z"
}
}
],
"references": []
},
{
"event_id": "S230706an",
"sequences": [
{
"id": 462,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 939,
"topic": "igwn.gwalert",
"uuid": "ee9b127e-4692-455b-b846-e0b12b03f899",
"title": "S230706an - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230706an/view/"
},
"event": {
"far": 1.988680306135957e-05,
"time": "2023-07-06T12:06:49.606Z",
"group": "CBC",
"search": "AllSky",
"area_50": 629.4702339083752,
"area_90": 2498.577181793644,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.06926197658550601,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "d0bb12b186282fc43e72483c57c5f5d2",
"classification": {
"BBH": 1.9135991380152537e-05,
"BNS": 7.914714835972812e-07,
"NSBH": 0.001167168545569023,
"Terrestrial": 0.9988129039915672
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-06T12:07:19Z",
"superevent_id": "S230706an",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-06T12:07:20.375333Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-06T12:07:20.375391Z",
"modified": "2023-07-06T12:07:20.381593Z"
}
},
{
"id": 463,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 940,
"topic": "igwn.gwalert",
"uuid": "4aceef83-e7e7-4f42-9a13-97156a1e96a9",
"title": "S230706an - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230706an/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230706an/view/"
},
"event": {
"far": 1.988680306135957e-05,
"time": "2023-07-06T12:06:49.606Z",
"group": "CBC",
"search": "AllSky",
"area_50": 629.4702339083752,
"area_90": 2498.577181793644,
"duration": null,
"pipeline": "pycbc",
"properties": {
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"HasMassGap": 0.06926197658550601,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "d0bb12b186282fc43e72483c57c5f5d2",
"classification": {
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"BNS": 7.914714835972812e-07,
"NSBH": 0.001167168545569023,
"Terrestrial": 0.9988129039915672
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-07-06T12:11:53Z",
"superevent_id": "S230706an",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-06T12:11:54.225662Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-06T12:11:54.225704Z",
"modified": "2023-07-06T12:11:54.231827Z"
}
}
],
"references": []
},
{
"event_id": "S230706bv",
"sequences": [
{
"id": 468,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 952,
"topic": "igwn.gwalert",
"uuid": "70e18aee-8946-4487-946d-ddec757e7a8b",
"title": "S230706bv - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230706bv/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230706bv/view/"
},
"event": {
"far": 2.12898103200132e-05,
"time": "2023-07-06T21:40:27.541Z",
"group": "CBC",
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"area_50": 2339.1113892035223,
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"time_created": "2023-07-06T21:40:51Z",
"superevent_id": "S230706bv",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-06T21:40:52.510029Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-06T21:40:52.510051Z",
"modified": "2023-07-06T21:40:52.515776Z"
}
},
{
"id": 469,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 953,
"topic": "igwn.gwalert",
"uuid": "ff796409-d3dc-41bc-9141-4bcbfe2903c3",
"title": "S230706bv - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230706bv/view/"
},
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"time": "2023-07-06T21:40:27.541Z",
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"sequence_num": 2,
"time_created": "2023-07-06T21:45:25Z",
"superevent_id": "S230706bv",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-06T21:45:27.217315Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-06T21:45:27.217340Z",
"modified": "2023-07-06T21:45:27.222872Z"
}
}
],
"references": []
},
{
"event_id": "S230707o",
"sequences": [
{
"id": 471,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 958,
"topic": "igwn.gwalert",
"uuid": "173b945f-4f1d-45e9-b2eb-84622e2b4a5d",
"title": "S230707o - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230707o/view/"
},
"event": {
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"time": "2023-07-07T06:49:08.586Z",
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"time_created": "2023-07-07T06:50:17Z",
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"external_coinc": null
},
"message_text": "",
"published": "2023-07-07T06:50:18.378289Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-07T06:50:18.378328Z",
"modified": "2023-07-07T06:50:18.393903Z"
}
},
{
"id": 472,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 959,
"topic": "igwn.gwalert",
"uuid": "027187b4-69a3-4845-9eca-c0cd66cb6c48",
"title": "S230707o - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230707o/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230707o/view/"
},
"event": {
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"time_created": "2023-07-07T06:54:51Z",
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},
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"published": "2023-07-07T06:54:52.242420Z",
"message_parser": "IGWN Alert Avro Parser v1",
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"created": "2023-07-07T06:54:52.242444Z",
"modified": "2023-07-07T06:54:52.248667Z"
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}
],
"references": []
},
{
"event_id": "S230707v",
"sequences": [
{
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"sequence_type": "PRELIMINARY",
"message": {
"id": 960,
"topic": "igwn.gwalert",
"uuid": "3d900899-6b33-43e8-ad34-67b81469d0d3",
"title": "S230707v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"data": {
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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 S230707ai (GCN Circular 34161). 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/S230707ai\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3181 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4074 +/- 1485 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 [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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4OTM3NjI1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.UHUQBq2ybcMdwMddkKJMjpOTCzlhFUEigoYcK-05KZM\n\n",
"published": "2023-07-09T21:20:30.335137Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-09T21:20:30.335160Z",
"modified": "2023-07-09T21:20:30.346804Z",
"targets": []
},
{
"id": 974,
"topic": "gcn.circular",
"uuid": "a944d10c-85ec-46ad-bcd5-cbe3b052aa92",
"title": "LIGO/Virgo/KAGRA S230707ai: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "davide.guerra@ligo.org",
"data": {
"date": "23/07/07 13:53:41 GMT",
"from": "davide.guerra@ligo.org",
"title": "GCN CIRCULAR",
"number": "34161",
"subject": "LIGO/Virgo/KAGRA S230707ai: 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 S230707ai during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-07 12:40:47.349 UTC (GPS\ntime: 1372768865.349). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230707ai is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.4e-08 Hz, or about one in 2\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230707ai\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (95%), Terrestrial (5%), 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,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 28 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\n2714 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 3766 +/- 1135 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] 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\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4NzM4MDI2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.qrLh5wzVZeiICKQ41Kmdnh69pCTI_VMdSYL_HwulAfc\n\n",
"published": "2023-07-07T13:53:51.798148Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-07T13:53:51.798181Z",
"modified": "2023-07-07T13:53:51.806833Z",
"targets": []
}
]
},
{
"event_id": "S230707ay",
"sequences": [
{
"id": 484,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 975,
"topic": "igwn.gwalert",
"uuid": "62184ca2-c3b8-4969-aafd-5663e9f5351e",
"title": "S230707ay - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230707ay/view/"
},
"event": {
"far": 1.49326e-05,
"time": "2023-07-07T15:53:23.952Z",
"group": "Burst",
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"area_50": 1506.532093154045,
"area_90": 8830.208441266688,
"duration": 0.035784,
"pipeline": "CWB",
"properties": {},
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],
"significant": false,
"skymap_hash": "8ecaf93aba79abdf2e3ac1d8197456f8",
"classification": {},
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"time_created": "2023-07-07T15:56:19Z",
"superevent_id": "S230707ay",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-07T15:56:20.787560Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-07T15:56:20.787587Z",
"modified": "2023-07-07T15:56:20.795879Z"
}
},
{
"id": 485,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 976,
"topic": "igwn.gwalert",
"uuid": "ca413702-83d5-4b9c-b238-fca40a417a8e",
"title": "S230707ay - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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},
"event": {
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"time": "2023-07-07T15:53:23.952Z",
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"time_created": "2023-07-07T16:00:55Z",
"superevent_id": "S230707ay",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-07T16:00:56.612758Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-07T16:00:56.612802Z",
"modified": "2023-07-07T16:00:56.619124Z"
}
}
],
"references": []
},
{
"event_id": "S230707bh",
"sequences": [
{
"id": 486,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 979,
"topic": "igwn.gwalert",
"uuid": "94b06220-4b51-4d0e-8c0f-2a372b612d5e",
"title": "S230707bh - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230707bh/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230707bh/view/"
},
"event": {
"far": 6.213635909387818e-06,
"time": "2023-07-07T18:17:28.723Z",
"group": "CBC",
"search": "AllSky",
"area_50": 691.5779636540016,
"area_90": 2448.2195630809742,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.03210230956782681,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "ca8a392c63f0874d097887c82eb80d16",
"classification": {
"BBH": 0.29600827979365174,
"BNS": 5.808759295180135e-14,
"NSBH": 4.16492423697013e-12,
"Terrestrial": 0.7039917202021253
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-07T18:17:50Z",
"superevent_id": "S230707bh",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-07T18:17:52.068582Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-07T18:17:52.068612Z",
"modified": "2023-07-07T18:17:52.074666Z"
}
},
{
"id": 487,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 980,
"topic": "igwn.gwalert",
"uuid": "25527103-91a6-4f2b-8c2d-d4cb8ef6a212",
"title": "S230707bh - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230707bh/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230707bh/view/"
},
"event": {
"far": 6.213635909387818e-06,
"time": "2023-07-07T18:17:28.723Z",
"group": "CBC",
"search": "AllSky",
"area_50": 691.5779636540016,
"area_90": 2448.2195630809742,
"duration": null,
"pipeline": "gstlal",
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"HasMassGap": 0.03210230956782681,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "ca8a392c63f0874d097887c82eb80d16",
"classification": {
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"BNS": 5.808759295180135e-14,
"NSBH": 4.16492423697013e-12,
"Terrestrial": 0.7039917202021253
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-07-07T18:22:31Z",
"superevent_id": "S230707bh",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-07T18:22:33.315004Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-07T18:22:33.315034Z",
"modified": "2023-07-07T18:22:33.321017Z"
}
}
],
"references": []
},
{
"event_id": "S230707bl",
"sequences": [
{
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"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 983,
"topic": "igwn.gwalert",
"uuid": "934dbbab-28f8-4640-9b44-cdf810df4d25",
"title": "S230707bl - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230707bl/view/"
},
"event": {
"far": 2.0711e-05,
"time": "2023-07-07T19:12:23.834Z",
"group": "Burst",
"search": "BBH",
"area_50": 3582.1052777612604,
"area_90": 11928.880579386316,
"duration": 0.043437,
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"sequence_num": 1,
"time_created": "2023-07-07T19:13:47Z",
"superevent_id": "S230707bl",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-07T19:13:48.719229Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-07T19:13:48.719257Z",
"modified": "2023-07-07T19:13:48.725338Z"
}
},
{
"id": 489,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 984,
"topic": "igwn.gwalert",
"uuid": "cfd8c252-9bcd-497f-afe1-eaf109360ce6",
"title": "S230707bl - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230707bl/view/"
},
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"time": "2023-07-07T19:12:23.834Z",
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"time_created": "2023-07-07T19:18:21Z",
"superevent_id": "S230707bl",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-07T19:18:23.409703Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-07T19:18:23.409732Z",
"modified": "2023-07-07T19:18:23.416281Z"
}
}
],
"references": []
},
{
"event_id": "S230707bo",
"sequences": [
{
"id": 490,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 986,
"topic": "igwn.gwalert",
"uuid": "4b44ccb2-351c-4176-9efa-c4b429065978",
"title": "S230707bo - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230707bo/view/"
},
"event": {
"far": 1.43385e-05,
"time": "2023-07-07T20:17:27.484Z",
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"time_created": "2023-07-07T20:18:44Z",
"superevent_id": "S230707bo",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-07T20:18:45.193453Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-07T20:18:45.193494Z",
"modified": "2023-07-07T20:18:45.199583Z"
}
},
{
"id": 491,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 987,
"topic": "igwn.gwalert",
"uuid": "3521df48-f046-4698-9e7a-7c5b744fd3d1",
"title": "S230707bo - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230707bo/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230707bo/view/"
},
"event": {
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},
"message_text": "",
"published": "2023-07-07T20:23:19.539829Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-07T20:23:19.539857Z",
"modified": "2023-07-07T20:23:19.545637Z"
}
}
],
"references": []
},
{
"event_id": "S230707bs",
"sequences": [
{
"id": 492,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 988,
"topic": "igwn.gwalert",
"uuid": "de1040d3-483a-4ac6-bc05-787d041d50b6",
"title": "S230707bs - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-07-07T20:47:37Z",
"superevent_id": "S230707bs",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-07T20:47:38.575616Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-07T20:47:38.575648Z",
"modified": "2023-07-07T20:47:38.583509Z"
}
},
{
"id": 493,
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"message": {
"id": 989,
"topic": "igwn.gwalert",
"uuid": "475339f0-e96f-443e-82aa-a947892d731f",
"title": "S230707bs - PRELIMINARY",
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"data": {
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"BNS": 1.1673107552317844e-17,
"NSBH": 8.439042046204218e-16,
"Terrestrial": 0.02725950370950947
},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 5,
"time_created": "2023-07-13T17:09:24Z",
"superevent_id": "S230708t",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-13T17:09:25.902509Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-13T17:09:25.902530Z",
"modified": "2023-07-13T17:09:25.908777Z"
}
}
],
"references": [
{
"id": 1222,
"topic": "gcn.circular",
"uuid": "1b83d069-e0d1-4856-bf91-89281ad07a6c",
"title": "LIGO/Virgo/KAGRA S230708t: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Patricia Schmidt at University of Birmingham <patricia.schmidt@ligo.org>",
"data": {
"date": "23/07/13 17:26:02 GMT",
"from": "Patricia Schmidt at University of Birmingham <patricia.schmidt@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34212",
"subject": "LIGO/Virgo/KAGRA S230708t: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe have conducted further offline analysis of the LIGO Hanford Observatory\n(H1) and LIGO Livingston Observatory (L1) data around the time of the\ncompact binary merger (CBC) candidate S230708t (GCN Circular 34194).\nParameter estimation has been performed using Bilby [1] and a new sky map,\nBilby.offline0.multiorder.fits,0, distributed via GCN Notice, is\navailable for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230708t\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible\nregion is 1227 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 3010 +/- 988 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] 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg5MjY5MTY4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.MocI8bS_tleENY7n4kWzCjlYrPv_SdTjm9Yi34lUJQc\n\n",
"published": "2023-07-13T17:26:17.234201Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-13T17:26:17.234232Z",
"modified": "2023-07-13T17:26:17.240857Z",
"targets": []
},
{
"id": 1089,
"topic": "gcn.circular",
"uuid": "a218fbfd-720f-465d-8056-8811ef8d0330",
"title": "LIGO/Virgo/KAGRA S230708t: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "adrian.helmling-cornell@ligo.org",
"data": {
"date": "23/07/10 15:31:18 GMT",
"from": "adrian.helmling-cornell@ligo.org",
"title": "GCN CIRCULAR",
"number": "34194",
"subject": "LIGO/Virgo/KAGRA S230708t: 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 S230708t during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-08 05:37:05.120 UTC (GPS\ntime: 1372829843.120). The candidate was found by the MBTA [1] and\nGstLAL [2] analysis pipelines.\n\nS230708t is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 4.3e-08 Hz, or about one in 8\nmonths. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230708t\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (97%), Terrestrial (3%), NSBH (<1%), or BNS (<1%).\n\nThere was a high rate of noise transients (glitches) in the LIGO Hanford\ndetector which may affect the parameters or the significance of\nthe 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%. [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 <1%.\n\nThree sky maps are available at this time and can be retrieved from\nthe GraceDB 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 36 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, 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,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n2292 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 3372 +/- 1101 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] Aubin et al. CQG 38, 095004 (2021)\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---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg5MDAzMDgzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.emq6L_m1rEXKKHloIcQHNnlbFCBE0BFap_Row-Z6TYQ\n\n",
"published": "2023-07-10T15:31:32.237757Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-10T15:31:32.237778Z",
"modified": "2023-07-10T15:31:32.246770Z",
"targets": []
}
]
},
{
"event_id": "S230708y",
"sequences": [
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"message": {
"id": 999,
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"title": "S230708y - PRELIMINARY",
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"data": {
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{
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"message": {
"id": 1000,
"topic": "igwn.gwalert",
"uuid": "d57a2224-7253-4eb2-8f1f-cf2f1dfe02fc",
"title": "S230708y - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"external_coinc": null
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"published": "2023-07-08T07:11:06.876354Z",
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],
"references": []
},
{
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{
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"message": {
"id": 1001,
"topic": "igwn.gwalert",
"uuid": "6bf3d00b-f643-408b-86cf-af1826fe0328",
"title": "S230708z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230708z/view/"
},
"event": {
"far": 7.026288032270329e-08,
"time": "2023-07-08T07:18:59.444Z",
"group": "CBC",
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"area_50": 852.7223435345458,
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"duration": null,
"pipeline": "gstlal",
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"BNS": 4.464246794331243e-16,
"NSBH": 3.254796044004244e-14,
"Terrestrial": 0.046044568088624005
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"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-08T07:19:24Z",
"superevent_id": "S230708z",
"external_coinc": null
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"published": "2023-07-08T07:19:25.696608Z",
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{
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"message": {
"id": 1002,
"topic": "igwn.gwalert",
"uuid": "4f02417b-d804-439c-918a-45a0a6dba3da",
"title": "S230708z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230708z/files/bayestar.multiorder.fits,0",
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},
"event": {
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"time": "2023-07-08T07:18:59.444Z",
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"Terrestrial": 0.046044568088624005
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"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-07-08T07:24:00Z",
"superevent_id": "S230708z",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-08T07:24:01.809664Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
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"modified": "2023-07-08T07:24:01.817055Z"
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{
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"message": {
"id": 1090,
"topic": "igwn.gwalert",
"uuid": "ff7f98cb-0c46-412d-a310-7d5d317ccd56",
"title": "S230708z - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230708z/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230708z/view/"
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"event": {
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"time": "2023-07-08T07:18:59.444Z",
"group": "CBC",
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"BNS": 4.464246794331243e-16,
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"external_coinc": null
},
"message_text": "",
"published": "2023-07-10T15:50:57.260410Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-10T15:50:57.260445Z",
"modified": "2023-07-10T15:50:57.267908Z"
}
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{
"id": 709,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 1315,
"topic": "igwn.gwalert",
"uuid": "02d014c8-6338-4ec3-8885-75c85a573932",
"title": "S230708z - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230708z/view/"
},
"event": {
"far": 7.026288032270329e-08,
"time": "2023-07-08T07:18:59.444Z",
"group": "CBC",
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"area_50": 1018.6926618750539,
"area_90": 3372.2818664584693,
"duration": null,
"pipeline": "gstlal",
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"NSBH": 3.254796044004244e-14,
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"skymap_version": 1,
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},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-07-17T13:40:22Z",
"superevent_id": "S230708z",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-17T13:40:23.428132Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-17T13:40:23.428184Z",
"modified": "2023-07-17T13:40:23.433588Z"
}
}
],
"references": [
{
"id": 1316,
"topic": "gcn.circular",
"uuid": "4fbbb18f-5bf3-4b31-8ef0-05ed23137db1",
"title": "LIGO/Virgo/KAGRA S230708z: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Colm Talbot at MIT <talbotcolm@gmail.com>",
"data": {
"date": "23/07/17 13:43:40 GMT",
"from": "Colm Talbot at MIT <talbotcolm@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34221",
"subject": "LIGO/Virgo/KAGRA S230708z: 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 Hanford Observatory\n(H1) and LIGO Livingston Observatory (L1) data around the time of the\ncompact binary merger (CBC) candidate S230708z (GCN Circular 34195). 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/S230708z\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is\n3373 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 4647 +/- 1696 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg5NjAxNDI2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.0PIwZ_v2cPSzi7nCSBXrzvJhYF0hRgusSCjZwwxKvVs\n\n",
"published": "2023-07-17T13:43:55.031978Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-17T13:43:55.031998Z",
"modified": "2023-07-17T13:43:55.037254Z",
"targets": []
},
{
"id": 1091,
"topic": "gcn.circular",
"uuid": "2451c561-4d9a-4bb9-a22e-ce8920f2a436",
"title": "LIGO/Virgo/KAGRA S230708z: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "adrian.helmling-cornell@ligo.org",
"data": {
"date": "23/07/10 15:58:45 GMT",
"from": "adrian.helmling-cornell@ligo.org",
"title": "GCN CIRCULAR",
"number": "34195",
"subject": "LIGO/Virgo/KAGRA S230708z: 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 S230708z during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-08 07:18:59.444 UTC (GPS\ntime: 1372835957.444). The candidate was found by the CWB [1], MBTA\n[2], and GstLAL [3] analysis pipelines.\n\nS230708z is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 7e-08 Hz, or about one in 5\nmonths. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230708z\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (95%), Terrestrial (5%), NSBH (<1%), or BNS (<1%).\n\nThere was a high rate of noise transients (glitches) in the LIGO\nLivingston detector which may affect the parameters or the significance\nof 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%. [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 24 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\n3111 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 5796 +/- 1854 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] 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] Chatterjee et al. ApJ 896, 54 (2020)\n [5] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg5MDA0NzMxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Cc9dio8XBQrdmSu0MapY-JSEWz4D5M_iHKq-QimEMsA\n\n",
"published": "2023-07-10T15:58:56.332248Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-10T15:58:56.332268Z",
"modified": "2023-07-10T15:58:56.340427Z",
"targets": []
}
]
},
{
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"message": {
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"title": "S230708ah - PRELIMINARY",
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"title": "S230708ah - PRELIMINARY",
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"title": "S230708br - PRELIMINARY",
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"data": {
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],
"references": []
},
{
"event_id": "S230708b",
"sequences": [],
"references": [
{
"id": 1030,
"topic": "gcn.circular",
"uuid": "4583bb1b-41f6-47f9-8bc8-f1f7988385b7",
"title": "LIGO/Virgo/KAGRA S230708bi: Retraction of GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "adrian.helmling-cornell@ligo.org",
"data": {
"date": "23/07/08 19:04:14 GMT",
"from": "adrian.helmling-cornell@ligo.org",
"title": "GCN CIRCULAR",
"number": "34172",
"subject": "LIGO/Virgo/KAGRA S230708bi: Retraction of GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nThe trigger S230708bi is no longer considered to be a candidate of\ninterest. Data surrounding the trigger is consistent with a known\nclass of instrumental artifacts at LIGO Livingston.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4ODQzMDU5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.4ZAgghnWc8sfNU5XqRojxxqITxe8w2MoUAf4N2zsrgI\n\n",
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"retracted": false,
"created": "2023-07-08T19:04:28.739480Z",
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}
]
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"message": {
"id": 1032,
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"title": "S230708bv - PRELIMINARY",
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"data": {
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"title": "S230708bv - PRELIMINARY",
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"data": {
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"time_created": "2023-07-08T19:29:23Z",
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}
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{
"event_id": "S230708cf",
"sequences": [
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"message": {
"id": 1034,
"topic": "igwn.gwalert",
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"title": "S230708cf - PRELIMINARY",
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"data": {
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"message": {
"id": 1035,
"topic": "igwn.gwalert",
"uuid": "b47c5a23-02f8-468f-bfe0-761f450b2761",
"title": "S230708cf - PRELIMINARY",
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"data": {
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"published": "2023-07-08T23:14:40.935054Z",
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{
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"sequence_number": 3,
"sequence_type": "INITIAL",
"message": {
"id": 1036,
"topic": "igwn.gwalert",
"uuid": "4ef8b0bb-9c70-4837-8dd9-06a5eaf82aaa",
"title": "S230708cf - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
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"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-07-08T23:38:09Z",
"superevent_id": "S230708cf",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-08T23:38:10.336907Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-08T23:38:10.336933Z",
"modified": "2023-07-08T23:38:10.346794Z"
}
},
{
"id": 558,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 1076,
"topic": "igwn.gwalert",
"uuid": "c0a8fb22-9762-4e52-bb1d-83f51210c369",
"title": "S230708cf - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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},
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"time": "2023-07-08T23:09:35.477Z",
"group": "CBC",
"search": "AllSky",
"area_50": 440.8389871471655,
"area_90": 2031.0906214110241,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"HasRemnant": 0.0
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"significant": true,
"skymap_hash": "644db9dc9a94f13bf941d358ff50add9",
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"BNS": 2.40713824302125e-22,
"NSBH": 2.3113331209517412e-10,
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"sequence_num": 4,
"time_created": "2023-07-10T07:07:53Z",
"superevent_id": "S230708cf",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-10T07:07:55.765013Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-10T07:07:55.765042Z",
"modified": "2023-07-10T07:07:55.776770Z"
}
}
],
"references": []
},
{
"event_id": "S230708c",
"sequences": [],
"references": [
{
"id": 1078,
"topic": "gcn.circular",
"uuid": "3481a8b1-30f6-4a63-a7fb-6b3754f8244a",
"title": "LIGO/Virgo/KAGRA S230708cf: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "jgolomb@caltech.edu",
"data": {
"date": "23/07/10 07:10:11 GMT",
"from": "jgolomb@caltech.edu",
"title": "GCN CIRCULAR",
"number": "34190",
"subject": "LIGO/Virgo/KAGRA S230708cf: 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 S230708cf (GCN Circular 34173). 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/S230708cf\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 2032 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3336 +/- 1076 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4OTczMDE2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.jyGY_LynbbB7bdcVPUdzB-M2uk9jCXSlCVmIZGrZbvE\n\n",
"published": "2023-07-10T07:10:21.573332Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-10T07:10:21.573352Z",
"modified": "2023-07-10T07:10:21.597103Z",
"targets": []
},
{
"id": 1037,
"topic": "gcn.circular",
"uuid": "ee5cef6c-ae07-416e-aa53-54ef0fe9a536",
"title": "LIGO/Virgo/KAGRA S230708cf: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Nobuyuki Kanda at Nambu Yoichiro Institute of Theoretical and Experimental Physics, Osaka Metropolitan University <kanda@omu.ac.jp>",
"data": {
"date": "23/07/09 00:47:47 GMT",
"from": "Nobuyuki Kanda at Nambu Yoichiro Institute of Theoretical and Experimental Physics, Osaka Metropolitan University <kanda@omu.ac.jp>",
"title": "GCN CIRCULAR",
"number": "34173",
"subject": "LIGO/Virgo/KAGRA S230708cf: 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 S230708cf during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-08 23:09:35.477 UTC (GPS\ntime: 1372892993.477). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], and SPIIR [4] analysis pipelines.\n\nS230708cf is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.6e-08 Hz, or about one in 2\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230708cf\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (99%), Terrestrial (1%), 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%. [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,0, an initial localization generated by\nBAYESTAR [6], distributed via GCN notice about 25 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, 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,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n2525 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 2056 +/- 608 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] 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] 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4ODYzNjcyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.wBUFsV2icpiY15_i67BlA0eTO7tLjYh-cJLKsK9Gc4s\n\n",
"published": "2023-07-09T00:47:57.864312Z",
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{
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{
"id": 1224,
"topic": "gcn.circular",
"uuid": "64201da7-9da6-4daa-a471-6374b20cced6",
"title": "LIGO/Virgo/KAGRA S230709bi: Updated Sky localization",
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"authors": "Colm Talbot at MIT <talbotcolm@gmail.com>",
"data": {
"date": "23/07/13 17:38:51 GMT",
"from": "Colm Talbot at MIT <talbotcolm@gmail.com>",
"title": "GCN CIRCULAR",
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},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe have conducted further offline analysis of the LIGO Hanford Observatory\n(H1) and LIGO Livingston Observatory (L1) data around the time of the\ncompact binary merger (CBC) candidate S230709bi (GCN Circular 34175). 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/S230709bi\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is\n2644 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 4364 +/- 1585 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg5MjY5OTM2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.gCAZRJgTrzy_Ndz8212gIHEE3DkdrGrNe0zGLa9hJVQ\n\n",
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"topic": "gcn.circular",
"uuid": "5307409e-3564-4bf4-96d5-de0abd260cc3",
"title": "LIGO/Virgo/KAGRA S230709bi: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Nicolas Sanchis-Gual at University of Valencia <nicolas.sanchis-gual@ligo.org>",
"data": {
"date": "23/07/09 13:34:01 GMT",
"from": "Nicolas Sanchis-Gual at University of Valencia <nicolas.sanchis-gual@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34175",
"subject": "LIGO/Virgo/KAGRA S230709bi: 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 S230709bi during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-07-09 12:27:27.202 UTC (GPS\ntime: 1372940865.202). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230709bi is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3.1e-09 Hz, or about one in 10\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230709bi\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%. [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 25 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 14 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\n2937 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 5009 +/- 1547 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] 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4OTA5NjQ2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.8t5Y6bdU_w7yWEhjPRiANPnJJFWRS9u8NtX5PLn2mKY\n\n",
"published": "2023-07-09T13:34:11.492919Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-09T13:34:11.492946Z",
"modified": "2023-07-09T13:34:11.500694Z",
"targets": []
}
]
},
{
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"message": {
"id": 1080,
"topic": "igwn.gwalert",
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"title": "S230710h - PRELIMINARY",
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"title": "S230710h - PRELIMINARY",
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"title": "S230710p - PRELIMINARY",
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}