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{
"id": 5780353,
"topic": "gcn.circulars",
"uuid": "3b63c766-927a-4852-8b7e-212d5136db23",
"title": "LIGO/Virgo/KAGRA S250920bq: Coverage and upper limits from MAXI/GSC observations",
"submitter": "Satoshi Sugita at Aoyama Gakuin U. <sugita@phys.aoyama.ac.jp>",
"authors": "Satoshi Sugita at Aoyama Gakuin U. <sugita@phys.aoyama.ac.jp>",
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"eventId": "LIGO/Virgo/KAGRA S250920bq",
"subject": "LIGO/Virgo/KAGRA S250920bq: Coverage and upper limits from MAXI/GSC observations",
"createdOn": 1758379417934,
"submitter": "Satoshi Sugita at Aoyama Gakuin U. <sugita@phys.aoyama.ac.jp>",
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"message_text": "Y. Kawakubo, S. Sugita, M. Serino, H. Hiramatsu, Y. Kondo (AGU)\nH. Negoro, M. Nakajima, K. Takagi (Nihon U.),\nN. Kawai, T. Mihara, (RIKEN),\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter compact binary merger candidate S250920bq at 2025-09-20 10:27:39.063 UTC.\n\nAt the trigger time of S250920bq, the high-voltage of MAXI/GSC was on,\nbut the FOV was out of the 90% credible region of the bayestar skymap.\nThe first one-orbit (92 min) scan observation with GSC after the event covered 100%\nof the 90% credible region of the bayestar skymap from 10:30:54 to 10:46:39 UTC (T0+195 to T0+1140 sec).\n\nNo significant new source was found in the region in the one-orbit scan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\nIf you require information about X-ray flux by MAXI/GSC at specific coordinates,\nplease contact the submitter of this circular by email.\n",
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{
"id": 5780963,
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"title": "LIGO/Virgo/KAGRA S250911ac: Identification of a GW compact binary merger candidate",
"submitter": "Iara Tosta e Melo at UniCT <iara.tosta.melo@dfa.unict.it>",
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"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250911ac during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2025-09-11 07:46:39.272 UTC (GPS time: 1441612017.272). The candidate was found by the Aframe [1], cWB BBH [2], GstLAL [3], MBTA [4], PyCBC Live [5], and SPIIR [6] analysis pipelines.\n\nS250911ac is an event of interest because its false alarm rate, as estimated by the online analysis, is 6e-09 Hz, or about one in 5 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250911ac\n\nThe initial classification of the GW signal, in order of descending probability, based on chirp-mass information only [5], is BBH (84%), NSBH (13%), Terrestrial (4%), or BNS (<1%).\n\nNoise transients (glitches) were present in LIGO Hanford detector data within two seconds of the event time, 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%. [7] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [7] 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 7%.\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 [8], distributed via GCN and SCiMMA notices about 27 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [8], 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 1012 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1102 +/- 300 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] Marx et al. PRD 111, 042010 (2025) doi:10.1103/PhysRevD.111.042010\n [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\n [3] 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 [4] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [5] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a\n [6] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023\n [7] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [8] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n\n",
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"sequence_num": 4,
"time_created": "2025-09-17T15:10:45Z",
"superevent_id": "S250917aq",
"external_coinc": null
},
"message_text": "",
"published": "2025-09-17T15:10:46.669251Z",
"message_parser": "IGWN Alert Avro Parser v1",
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"created": "2025-09-17T15:10:46.669266Z",
"modified": "2025-09-17T15:10:46.677718Z"
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],
"references": [
{
"id": 5781090,
"topic": "gcn.circulars",
"uuid": "ee6f2c38-960e-4eca-9e22-0d6fc7ae3876",
"title": "LIGO/Virgo/KAGRA S250917aq: Updated Sky localization",
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
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"gcn_circular": "https://gcn.nasa.gov/circulars/41856"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41856....1L",
"eventId": "LIGO/Virgo/KAGRA S250917aq",
"subject": "LIGO/Virgo/KAGRA S250917aq: Updated Sky localization",
"createdOn": 1758139023819,
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"circularId": 41856,
"submittedHow": "web"
},
"message_text": "\nThe 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 S250917aq (GCN Circular 41850). 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/S250917aq\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 5216 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 696 +/- 162 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",
"published": "2025-09-22T08:08:53.932059Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-22T08:08:53.932069Z",
"modified": "2025-09-22T08:08:53.935704Z",
"targets": []
},
{
"id": 5781089,
"topic": "gcn.circulars",
"uuid": "9ae9fa03-88f7-4a1e-b72e-d98156e67aa6",
"title": "LIGO/Virgo/KAGRA S250917aq: Identification of a GW compact binary merger candidate",
"submitter": "daniela.pascucci@ugent.be",
"authors": "daniela.pascucci@ugent.be",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41850"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41850....1L",
"eventId": "LIGO/Virgo/KAGRA S250917aq",
"subject": "LIGO/Virgo/KAGRA S250917aq: Identification of a GW compact binary merger candidate",
"createdOn": 1758118705732,
"submitter": "daniela.pascucci@ugent.be",
"circularId": 41850,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250917aq during real-time processing of data from LIGO Hanford Observatory (H1) and Virgo Observatory (V1) at 2025-09-17 13:21:54.401 UTC (GPS time: 1442150532.401). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS250917aq is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.1e-13 Hz, or about one in 1e5 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250917aq\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 3%.\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 5646 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 687 +/- 182 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",
"published": "2025-09-22T08:08:53.915414Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-22T08:08:53.915422Z",
"modified": "2025-09-22T08:08:53.918800Z",
"targets": []
},
{
"id": 5780914,
"topic": "gcn.circulars",
"uuid": "d5cf6316-bc88-4661-8cdd-7f8c204fb84a",
"title": "LIGO/Virgo/KAGRA S250917aq: Three counterpart neutrino candidates from IceCube neutrino searches",
"submitter": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
"authors": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41857"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41857....1I",
"eventId": "LIGO/Virgo/KAGRA S250917aq",
"subject": "LIGO/Virgo/KAGRA S250917aq: Three counterpart neutrino candidates from IceCube neutrino searches",
"createdOn": 1758143139453,
"submitter": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
"circularId": 41857,
"submittedHow": "web"
},
"message_text": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nSearches for track-like muon neutrino events detected by IceCube consistent with the sky \nlocalization of gravitational-wave candidate S250917aq in a time range of 1000 seconds \ncentered on the alert event time (2025-09-17 13:13:34.401 UTC to 2025-09-17 13:30:14.401 UTC) have been performed [1,2]. During this time period IceCube was collecting good quality data. Two hypothesis tests were conducted. The first search is a maximum likelihood analysis which searches for a generic point-like neutrino source coincident with the given GW skymap. The second uses a Bayesian approach to quantify the joint GW + neutrino event significance, which assumes a binary merger scenario and accounts for known astrophysical priors, such as GW source distance, in the significance estimate [3].\n\nThree track-like events are found in spatial and temporal coincidence with the gravitational-wave \ncandidate S250917aq calculated from the map circulated in the 4-Update notice. This represents an overall p-value of 0.0096 from the generic transient search and an overall p-value of 0.0197 for the Bayesian search. These p-values measure the consistency of the observed track-like events with the known atmospheric backgrounds for this single map (not trials corrected for multiple GW events). The most probable multi-messenger source direction based on the neutrinos and GW skymap is RA 243.72, Dec -34.23 degrees in the generic transient search.\n\nThe reported p-values can differ due to the estimated distance of the GW candidate. The distance is used as a prior in the Bayesian binary merger search, while it is not taken into account in the generic transient point-like source search. 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. Additional details \nand updates will be posted at https://roc.icecube.wisc.edu/public/LvkNuTrackSearch/.\n\nProperties of the coincident events are shown below.\n\n| dt(s) | RA(deg) | Dec(deg) | Angular uncertainty(deg)| p-value(generic transient)| p-value(Bayesian) |\n|-------|----------|----------|-------------------------|---------------------------|-----------------------|\n| -497.79 | 228.08 | -34.97 | 0.43\t| 0.0307 | null |\n| -82.26 | 243.67 | -34.25 | 0.43\t| 0.0096 | 0.0809 |\n| -62.98 | 38.47 | 36.82 | 3.99 | null | 0.0302 |\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 representing 90% CL containment by area.\np-value = the p-value for this specific track event from each search. Event p-values are provided when the per-event p-value is less than 0.1 in either 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",
"published": "2025-09-22T08:08:48.174475Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-22T08:08:48.174483Z",
"modified": "2025-09-22T08:08:48.178189Z",
"targets": []
},
{
"id": 5779422,
"topic": "gcn.circulars",
"uuid": "d380848f-a9ab-4ce9-87ba-9e9d72dc6460",
"title": "LIGO/Virgo/KAGRA S250917aq: Three counterpart neutrino candidates from IceCube neutrino searches",
"submitter": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
"authors": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
"data": {
"urls": {
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},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250917aq",
"subject": "LIGO/Virgo/KAGRA S250917aq: Three counterpart neutrino candidates from IceCube neutrino searches",
"createdOn": 1758143139453,
"submitter": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
"circularId": 41857,
"submittedHow": "web"
},
"message_text": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nSearches for track-like muon neutrino events detected by IceCube consistent with the sky \nlocalization of gravitational-wave candidate S250917aq in a time range of 1000 seconds \ncentered on the alert event time (2025-09-17 13:13:34.401 UTC to 2025-09-17 13:30:14.401 UTC) have been performed [1,2]. During this time period IceCube was collecting good quality data. Two hypothesis tests were conducted. The first search is a maximum likelihood analysis which searches for a generic point-like neutrino source coincident with the given GW skymap. The second uses a Bayesian approach to quantify the joint GW + neutrino event significance, which assumes a binary merger scenario and accounts for known astrophysical priors, such as GW source distance, in the significance estimate [3].\n\nThree track-like events are found in spatial and temporal coincidence with the gravitational-wave \ncandidate S250917aq calculated from the map circulated in the 4-Update notice. This represents an overall p-value of 0.0096 from the generic transient search and an overall p-value of 0.0197 for the Bayesian search. These p-values measure the consistency of the observed track-like events with the known atmospheric backgrounds for this single map (not trials corrected for multiple GW events). The most probable multi-messenger source direction based on the neutrinos and GW skymap is RA 243.72, Dec -34.23 degrees in the generic transient search.\n\nThe reported p-values can differ due to the estimated distance of the GW candidate. The distance is used as a prior in the Bayesian binary merger search, while it is not taken into account in the generic transient point-like source search. 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. Additional details \nand updates will be posted at https://roc.icecube.wisc.edu/public/LvkNuTrackSearch/.\n\nProperties of the coincident events are shown below.\n\n| dt(s) | RA(deg) | Dec(deg) | Angular uncertainty(deg)| p-value(generic transient)| p-value(Bayesian) |\n|-------|----------|----------|-------------------------|---------------------------|-----------------------|\n| -497.79 | 228.08 | -34.97 | 0.43\t| 0.0307 | null |\n| -82.26 | 243.67 | -34.25 | 0.43\t| 0.0096 | 0.0809 |\n| -62.98 | 38.47 | 36.82 | 3.99 | null | 0.0302 |\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 representing 90% CL containment by area.\np-value = the p-value for this specific track event from each search. Event p-values are provided when the per-event p-value is less than 0.1 in either 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",
"published": "2025-09-17T21:05:49.365114Z",
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"retracted": false,
"created": "2025-09-17T21:05:49.365141Z",
"modified": "2025-09-17T21:05:49.375670Z",
"targets": []
},
{
"id": 5779410,
"topic": "gcn.circulars",
"uuid": "2f433141-fdc2-48ae-b05e-40a34dcd4147",
"title": "LIGO/Virgo/KAGRA S250917aq: Updated Sky localization",
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41856"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250917aq",
"subject": "LIGO/Virgo/KAGRA S250917aq: Updated Sky localization",
"createdOn": 1758139023819,
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"circularId": 41856,
"submittedHow": "web"
},
"message_text": "\nThe 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 S250917aq (GCN Circular 41850). 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/S250917aq\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 5216 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 696 +/- 162 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",
"published": "2025-09-17T19:57:13.061582Z",
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"retracted": false,
"created": "2025-09-17T19:57:13.061597Z",
"modified": "2025-09-17T19:57:13.070812Z",
"targets": []
},
{
"id": 5779337,
"topic": "gcn.circulars",
"uuid": "bd484a11-47d9-4a7d-a4ac-33a6c7e4cf2b",
"title": "LIGO/Virgo/KAGRA S250917aq: Identification of a GW compact binary merger candidate",
"submitter": "daniela.pascucci@ugent.be",
"authors": "daniela.pascucci@ugent.be",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41850"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250917aq",
"subject": "LIGO/Virgo/KAGRA S250917aq: Identification of a GW compact binary merger candidate",
"createdOn": 1758118705732,
"submitter": "daniela.pascucci@ugent.be",
"circularId": 41850,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250917aq during real-time processing of data from LIGO Hanford Observatory (H1) and Virgo Observatory (V1) at 2025-09-17 13:21:54.401 UTC (GPS time: 1442150532.401). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS250917aq is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.1e-13 Hz, or about one in 1e5 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250917aq\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 3%.\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 5646 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 687 +/- 182 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",
"published": "2025-09-17T14:18:34.085507Z",
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"retracted": false,
"created": "2025-09-17T14:18:34.085526Z",
"modified": "2025-09-17T14:18:34.101073Z",
"targets": []
}
]
},
{
"event_id": "S250922bj",
"sequences": [
{
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"sequence_type": "PRELIMINARY",
"message": {
"id": 5781117,
"topic": "igwn.gwalert",
"uuid": "28491455-969a-4231-ad8a-190a93cc1296",
"title": "S250922bj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S250922bj/view/"
},
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"time": "2025-09-22T11:01:37.917Z",
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"Terrestrial": 0.9971808930522998
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"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-09-22T11:02:02Z",
"superevent_id": "S250922bj",
"external_coinc": null
},
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"published": "2025-09-22T11:02:03.204346Z",
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"modified": "2025-09-22T11:02:03.211462Z"
}
},
{
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"message": {
"id": 5781118,
"topic": "igwn.gwalert",
"uuid": "f699a093-5e54-48fa-b8fc-734b21de2bec",
"title": "S250922bj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S250922bj/view/"
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"group": "CBC",
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