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"uuid": "3ca9a67a-7348-44b8-becc-e899d4df7847",
"title": "LIGO/Virgo/KAGRA S250814bg: Identification of a GW compact binary merger candidate possibly associated with GRB 250814A detected by Fermi GBM and Swift BAT",
"submitter": "Sreeta Roy at University of Warsaw <sreeta.roy@ligo.org>",
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"eventId": "LIGO/Virgo/KAGRA S250814bg",
"subject": "LIGO/Virgo/KAGRA S250814bg: Identification of a GW compact binary merger candidate possibly associated with GRB 250814A detected by Fermi GBM and Swift BAT",
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"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration with the Fermi GBM team and Swift team report:\n\nWe identified the compact binary merger candidate S250814bg during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-08-14 07:35:05.587 UTC (GPS time: 1439192123.587). The candidate was found by the GstLAL [1] analysis pipeline.\n\nBased on the analysis of gravitational-wave data alone, this candidate does not meet our criteria for a high-significance public alert as its false alarm rate is estimated by the online analysis to be 0.00012 Hz or about one in 2 hours. However, a search performed by the RAVEN pipeline found a significant coincidence between this candidate and Fermi GBM trigger with ID 776849714, which is associated with GRB 250814A. The event’s properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250814bg\n\nThe classification of the GW signal, in order of descending probability, is Terrestrial (>99%), BBH (<1%), NSBH (<1%), or BNS (<1%).\n\nExcess noise was present in the L1 detector at the time of this candidate, which may affect the parameters or the significance of the candidate. \n\nAssuming the candidate is astrophysical in origin, the probability that at least one of the compact objects 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 for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is 3%.\n\nThe source chirp mass falls with highest probability in the bin (22.0, 44.0) solar masses, assuming the candidate is astrophysical in origin.\n\nTwo GW-only sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN and SCiMMA notices about 2 minutes after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN and SCiMMA notices about 6 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 7867 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 13504 +/- 6537 Mpc (a posteriori mean +/- standard deviation).\n\nA search performed by the RAVEN pipeline [4] found a temporal coincidence between S250814bg and a Fermi GBM trigger with ID 776849714, which is associated with GRB 250814A (Fermi GBM Team, GCN Circular 41357). The GRB trigger time is 3.7 seconds after the GW candidate event. The estimated joint false alarm rate for the coincidence using just timing info before trials are applied is 7.5e-09 Hz, or about one in 4 years.\n\nCombined sky maps are also available:\n * combined-ext.multiorder.fits,0, an initial localization, distributed via GCN and SCiMMA notices about 2 minutes after the candidate event time.\n * combined-ext.multiorder.fits,1, an initial localization, distributed via GCN and SCiMMA notices about 6 minutes after the candidate event time.\n * combined-ext.multiorder.fits,2, an initial localization, distributed via GCN and SCiMMA notices about an hour after the candidate event time.\n\nFor the combined-ext.multiorder.fits,2 sky map, the 90% credible region is 471 deg2. Considering the overlap of the individual sky maps, the estimated joint false alarm rate for the spatial and temporal coincidence before trials are applied is 1.5e-08 Hz, or about one in 2 years. After including the trials factor of 30, the joint false alarm rate becomes 4.5e-07 Hz, or about 14 per year.\n\nMoreover, the GW candidate is 6 seconds after the Swift-BAT trigger 1342439, associated with the same GRB 250814A (Swift Team, GCN Circular 41358). The Swift-BAT GRB is spatio-temporal coincident with the Fermi GBM one, therefore they can be reliably considered the same astrophysical event. Considering the Swift-BAT localization, the estimated joint false alarm rate between the Swift-BAT and the GW candidate for the spatial and temporal coincidence before trials are applied is 1.0e-08 Hz, or about one in 3 years. After including the trials factor of 30, the joint false alarm rate becomes 3.0e-07 Hz, or about 9 per year.\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008\n [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [3] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n [4] Urban, A. L. 2016, Ph.D. Thesis https://dc.uwm.edu/etd/1218 and Piotrzkowski, B. J. 2022, Ph.D. Thesis https://dc.uwm.edu/etd/3060\n",
"published": "2025-09-08T08:09:01.281039Z",
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"created": "2025-09-08T08:09:01.281056Z",
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]
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"message": {
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"authors": "LVK",
"data": {
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"title": "S250810ck - PRELIMINARY",
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"data": {
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{
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"topic": "igwn.gwalert",
"uuid": "9e9fa49b-812c-4b0e-950e-eda3324eb10d",
"title": "S250810ck - INITIAL",
"submitter": "cody.messick-30d512c8",
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"data": {
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"sequence_num": 3,
"time_created": "2025-08-10T14:49:02Z",
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"published": "2025-08-10T14:49:03.515844Z",
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"modified": "2025-08-10T14:49:03.523609Z"
}
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{
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"message": {
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"topic": "igwn.gwalert",
"uuid": "4de90049-92ee-4b32-b967-3d819096b083",
"title": "S250810ck - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S250810ck/view/"
},
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},
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"published": "2025-08-11T08:02:01.165378Z",
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}
}
],
"references": [
{
"id": 5776730,
"topic": "gcn.circulars",
"uuid": "d8907ae1-f7cf-4fec-be4e-dc32377c887c",
"title": "LIGO/Virgo/KAGRA S250810ck: Identification of a GW compact binary merger candidate",
"submitter": "Anna Moreso Serra at ICCUB <anna.moreso-serra@ligo.org>",
"authors": "Anna Moreso Serra at ICCUB <anna.moreso-serra@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41315"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41315....1L",
"eventId": "LIGO/Virgo/KAGRA S250810ck",
"subject": "LIGO/Virgo/KAGRA S250810ck: Identification of a GW compact binary merger candidate",
"createdOn": 1754837918088,
"submitter": "Anna Moreso Serra at ICCUB <anna.moreso-serra@ligo.org>",
"circularId": 41315,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250810ck during real-time processing of data from LIGO Hanford Observatory (H1) and Virgo Observatory (V1) at 2025-08-10 14:23:57.336 UTC (GPS time: 1438871055.336). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS250810ck is an event of interest because its false alarm rate, as estimated by the online analysis, is 5.4e-20 Hz, or about one in 1e12 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250810ck\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), NSBH (<1%), Terrestrial (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that at least one of the compact objects 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 for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is 9%.\n\nThe source chirp mass falls with highest probability in the bin (5.5, 11.0) solar masses, assuming the candidate is astrophysical in origin.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN and SCiMMA notices about 25 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN and SCiMMA notices about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 3454 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 628 +/- 164 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008\n [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [3] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n\n",
"published": "2025-09-08T08:08:56.726969Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-08T08:08:56.726985Z",
"modified": "2025-09-08T08:08:56.731209Z",
"targets": []
},
{
"id": 5776522,
"topic": "gcn.circulars",
"uuid": "9a0a0ed4-f73f-4426-92bf-250edca6a300",
"title": "LIGO/Virgo/KAGRA S250810ck: Updated Sky localization and EM Bright Classification",
"submitter": "Soichiro Morisaki at U. of Tokyo <soichiro.morisaki@ligo.org>",
"authors": "Soichiro Morisaki at U. of Tokyo <soichiro.morisaki@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41317"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41317....1L",
"eventId": "LIGO/Virgo/KAGRA S250810ck",
"subject": "LIGO/Virgo/KAGRA S250810ck: Updated Sky localization and EM Bright Classification",
"createdOn": 1754900165133,
"submitter": "Soichiro Morisaki at U. of Tokyo <soichiro.morisaki@ligo.org>",
"circularId": 41317,
"submittedHow": "web"
},
"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 Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250810ck (GCN Circular 41315). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN and SCiMMA notices, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S250810ck\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S250810ck is astrophysical in origin, the probability that at least one of the compact objects is consistent with a neutron star mass above one solar 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] HasRemnant is assumed to be zero when the heavier component mass is below 1 solar mass. Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is 1%. The probability that the lighter compact object is below 1 solar mass (HasSSM) is <1%.\n\nThe source chirp mass falls with highest probability in the bin (5.5, 11.0) solar masses after parameter estimation [1], assuming the candidate is astrophysical in origin.\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 180 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 621 +/- 129 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040\n [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe",
"published": "2025-09-08T08:08:37.726821Z",
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"retracted": false,
"created": "2025-09-08T08:08:37.726847Z",
"modified": "2025-09-08T08:08:37.731372Z",
"targets": []
}
]
},
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"topic": "igwn.gwalert",
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"title": "S250814cb - PRELIMINARY",
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"authors": "LVK",
"data": {
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"sequence_num": 1,
"time_created": "2025-08-14T09:46:01Z",
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},
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"published": "2025-08-14T11:18:13.485806Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
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"modified": "2025-08-14T11:18:13.495838Z"
}
},
{
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"message": {
"id": 5456358,
"topic": "igwn.gwalert",
"uuid": "8cc31e6c-05bf-4e44-9530-da2be276ef0c",
"title": "S250814cb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S250814cb/view/"
},
"event": {
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"group": "CBC",
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"time_created": "2025-08-14T09:50:36Z",
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