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"title": "LIGO/Virgo/KAGRA S251006dd: Identification of a GW compact binary merger candidate",
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{
"id": 5785243,
"topic": "gcn.circulars",
"uuid": "080d3474-a5cf-425a-8ba4-3b1aaa62fa6a",
"title": "LIGO/Virgo/KAGRA S250929c: Identification of a GW compact binary merger candidate",
"submitter": "S. P. Stevenson at Swinburne University of Technology <simon.stevenson@ligo.org>",
"authors": "S. P. Stevenson at Swinburne University of Technology <simon.stevenson@ligo.org>",
"data": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.42023....1L",
"eventId": "LIGO/Virgo/KAGRA S250929c",
"subject": "LIGO/Virgo/KAGRA S250929c: Identification of a GW compact binary merger candidate",
"createdOn": 1759107218345,
"submitter": "S. P. Stevenson at Swinburne University of Technology <simon.stevenson@ligo.org>",
"circularId": 42023,
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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 S250929c during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-09-29 00:27:32.375 UTC (GPS time: 1443140870.375). The candidate was found by the Aframe [1], cWB [2], cWB BBH [3], GstLAL [4], and MBTA [5] analysis pipelines.\n\nS250929c is an event of interest because its false alarm rate, as estimated by the online analysis, is 2.5e-08 Hz, or about one in 1 year, 3 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250929c\n\nThe classification of the GW signal, in order of descending probability, is BBH (98%), Terrestrial (2%), NSBH (<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%. [6] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [6] 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%.\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 sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [7], distributed via GCN and SCiMMA notices about 26 seconds after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [7], 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,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 2197 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4423 +/- 1342 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] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004\n [3] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\n [4] 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 [5] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [6] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [7] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013",
"published": "2025-10-06T08:09:13.809620Z",
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"retracted": false,
"created": "2025-10-06T08:09:13.809634Z",
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},
{
"id": 5785240,
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"uuid": "27c304f7-74d9-4dad-bf20-04496922cf81",
"title": "LIGO/Virgo/KAGRA S250929c: Updated Sky localization",
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
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"eventId": "LIGO/Virgo/KAGRA S250929c",
"subject": "LIGO/Virgo/KAGRA S250929c: Updated Sky localization",
"createdOn": 1759156157670,
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"circularId": 42026,
"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), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250929c (GCN Circular 42023). 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/S250929c\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1828 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3796 +/- 1511 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": "2025-10-06T08:09:09.739103Z",
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{
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"uuid": "d7767c1b-6473-4d3f-adc3-8096e4954254",
"title": "LIGO/Virgo/KAGRA S250929c: Updated Sky localization",
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
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"eventId": "LIGO/Virgo/KAGRA S250929c",
"subject": "LIGO/Virgo/KAGRA S250929c: Updated Sky localization",
"createdOn": 1759156157670,
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"circularId": 42026,
"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), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250929c (GCN Circular 42023). 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/S250929c\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1828 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3796 +/- 1511 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": "2025-09-29T14:29:25.743486Z",
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"retracted": false,
"created": "2025-09-29T14:29:25.743513Z",
"modified": "2025-09-29T14:29:25.756805Z",
"targets": []
},
{
"id": 5782863,
"topic": "gcn.circulars",
"uuid": "a031875c-19aa-43f5-afbd-4b5bebd187c7",
"title": "LIGO/Virgo/KAGRA S250929c: Identification of a GW compact binary merger candidate",
"submitter": "S. P. Stevenson at Swinburne University of Technology <simon.stevenson@ligo.org>",
"authors": "S. P. Stevenson at Swinburne University of Technology <simon.stevenson@ligo.org>",
"data": {
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"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250929c",
"subject": "LIGO/Virgo/KAGRA S250929c: Identification of a GW compact binary merger candidate",
"createdOn": 1759107218345,
"submitter": "S. P. Stevenson at Swinburne University of Technology <simon.stevenson@ligo.org>",
"circularId": 42023,
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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 S250929c during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-09-29 00:27:32.375 UTC (GPS time: 1443140870.375). The candidate was found by the Aframe [1], cWB [2], cWB BBH [3], GstLAL [4], and MBTA [5] analysis pipelines.\n\nS250929c is an event of interest because its false alarm rate, as estimated by the online analysis, is 2.5e-08 Hz, or about one in 1 year, 3 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250929c\n\nThe classification of the GW signal, in order of descending probability, is BBH (98%), Terrestrial (2%), NSBH (<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%. [6] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [6] 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%.\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 sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [7], distributed via GCN and SCiMMA notices about 26 seconds after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [7], 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,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 2197 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4423 +/- 1342 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] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004\n [3] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\n [4] 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 [5] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [6] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [7] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013",
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{
"id": 5785308,
"topic": "gcn.circulars",
"uuid": "0a2163ce-6983-44a7-ab59-75257df0cccc",
"title": "LIGO/Virgo/KAGRA S250927ck: Identification of a GW compact binary merger candidate",
"submitter": "avanivikrambhai.patel@ligo.org",
"authors": "avanivikrambhai.patel@ligo.org",
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"bibcode": "2025GCN.42015....1L",
"eventId": "LIGO/Virgo/KAGRA S250927ck",
"subject": "LIGO/Virgo/KAGRA S250927ck: Identification of a GW compact binary merger candidate",
"createdOn": 1758991099637,
"submitter": "avanivikrambhai.patel@ligo.org",
"circularId": 42015,
"submittedHow": "web"
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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 S250927ck during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-09-27 15:24:48.939 UTC (GPS time: 1443021906.939). The candidate was found by the Aframe [1], cWB BBH [2], and GstLAL [3] analysis pipelines.\n\nS250927ck is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.1e-08 Hz, or about one in 1 year, 3 days. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250927ck\n\nThe classification of the GW signal, in order of descending probability, is BBH (98%), Terrestrial (2%), NSBH (<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%. [4] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [4] 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%.\n\nThe source chirp mass falls with highest probability in the bin (44.0, 88.0) 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 [5], distributed via GCN and SCiMMA notices about 26 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [5], 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 177 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4333 +/- 1544 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] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [5] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
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},
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"title": "LIGO/Virgo/KAGRA S250927ck: Updated Sky localization",
"submitter": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"authors": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"data": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.42021....1L",
"eventId": "LIGO/Virgo/KAGRA S250927ck",
"subject": "LIGO/Virgo/KAGRA S250927ck: Updated Sky localization",
"createdOn": 1759093793364,
"submitter": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"circularId": 42021,
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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), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250927ck (GCN Circular 42015). 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/S250927ck\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 67 deg2 described by the following DS9 region (right ascension, declination, semi-major axis, semi-minor axis, position angle of the semi-minor axis):\n icrs; ellipse(05h14m, -49d19m, 6.23d, 3.44d, 38.55d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 3566 +/- 911 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",
"published": "2025-10-06T08:09:14.159006Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-10-06T08:09:14.159017Z",
"modified": "2025-10-06T08:09:14.163475Z",
"targets": []
},
{
"id": 5782814,
"topic": "gcn.circulars",
"uuid": "ec360bbc-711f-496f-9594-eaa657ba56d8",
"title": "LIGO/Virgo/KAGRA S250927ck: Updated Sky localization",
"submitter": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"authors": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/42021"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250927ck",
"subject": "LIGO/Virgo/KAGRA S250927ck: Updated Sky localization",
"createdOn": 1759093793364,
"submitter": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"circularId": 42021,
"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), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250927ck (GCN Circular 42015). 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/S250927ck\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 67 deg2 described by the following DS9 region (right ascension, declination, semi-major axis, semi-minor axis, position angle of the semi-minor axis):\n icrs; ellipse(05h14m, -49d19m, 6.23d, 3.44d, 38.55d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 3566 +/- 911 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",
"published": "2025-09-28T21:10:02.755552Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-28T21:10:02.755575Z",
"modified": "2025-09-28T21:10:02.772019Z",
"targets": []
},
{
"id": 5782536,
"topic": "gcn.circulars",
"uuid": "b07cc679-55d7-4d2d-824b-b3ad77754db3",
"title": "LIGO/Virgo/KAGRA S250927ck: Identification of a GW compact binary merger candidate",
"submitter": "avanivikrambhai.patel@ligo.org",
"authors": "avanivikrambhai.patel@ligo.org",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/42015"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250927ck",
"subject": "LIGO/Virgo/KAGRA S250927ck: Identification of a GW compact binary merger candidate",
"createdOn": 1758991099637,
"submitter": "avanivikrambhai.patel@ligo.org",
"circularId": 42015,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250927ck during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-09-27 15:24:48.939 UTC (GPS time: 1443021906.939). The candidate was found by the Aframe [1], cWB BBH [2], and GstLAL [3] analysis pipelines.\n\nS250927ck is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.1e-08 Hz, or about one in 1 year, 3 days. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250927ck\n\nThe classification of the GW signal, in order of descending probability, is BBH (98%), Terrestrial (2%), NSBH (<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%. [4] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [4] 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%.\n\nThe source chirp mass falls with highest probability in the bin (44.0, 88.0) 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 [5], distributed via GCN and SCiMMA notices about 26 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [5], 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 177 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4333 +/- 1544 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] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [5] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
"published": "2025-09-27T16:38:29.456534Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-27T16:38:29.456553Z",
"modified": "2025-09-27T16:38:29.461322Z",
"targets": []
}
]
},
{
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"sequences": [
{
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"message": {
"id": 5782545,
"topic": "igwn.gwalert",
"uuid": "d5c6bb92-e18d-46c5-91b5-a84a94b4e984",
"title": "S250927cy - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250927cy/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250927cy/view/"
},
"event": {
"far": 5.313349233749549e-08,
"time": "2025-09-27T17:30:41.680Z",
"group": "CBC",
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"area_50": 409.1556520404439,
"area_90": 2259.3784929084613,
"duration": null,
"pipeline": "gstlal",
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"BNS": 9.11377121582436e-21,
"NSBH": 6.810545383144578e-19,
"Terrestrial": 0.038481306746480315
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-09-27T17:31:10Z",
"superevent_id": "S250927cy",
"external_coinc": null
},
"message_text": "",
"published": "2025-09-27T17:31:11.682519Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-09-27T17:31:11.682539Z",
"modified": "2025-09-27T17:31:11.693804Z"
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{
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"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 5782548,
"topic": "igwn.gwalert",
"uuid": "85e611d7-f414-41dd-8ff3-1fe059db1dd6",
"title": "S250927cy - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250927cy/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250927cy/view/"
},
"event": {
"far": 5.313349233749549e-08,
"time": "2025-09-27T17:30:41.678Z",
"group": "CBC",
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"area_50": 242.92305443580716,
"area_90": 1550.1753627050252,
"duration": null,
"pipeline": "gstlal",
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"BNS": 9.11377121582436e-21,
"NSBH": 6.810545383144578e-19,
"Terrestrial": 0.038481306746480315
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-09-27T17:35:46Z",
"superevent_id": "S250927cy",
"external_coinc": null
},
"message_text": "",
"published": "2025-09-27T17:35:47.638776Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-09-27T17:35:47.638794Z",
"modified": "2025-09-27T17:35:47.643415Z"
}
},
{
"id": 10618,
"sequence_number": 3,
"sequence_type": "INITIAL",
"message": {
"id": 5782554,
"topic": "igwn.gwalert",
"uuid": "818d8cad-5817-4c43-9835-1ed3ce3ef375",
"title": "S250927cy - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S250927cy/view/"
},
"event": {
"far": 5.313349233749549e-08,
"time": "2025-09-27T17:30:41.678Z",
"group": "CBC",
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"area_90": 1550.1753627050252,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"BNS": 9.11377121582436e-21,
"NSBH": 6.810545383144578e-19,
"Terrestrial": 0.038481306746480315
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2025-09-27T18:00:55Z",
"superevent_id": "S250927cy",
"external_coinc": null
},
"message_text": "",
"published": "2025-09-27T18:00:56.797987Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-09-27T18:00:56.798014Z",
"modified": "2025-09-27T18:00:56.802872Z"
}
},
{
"id": 10646,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 5782815,
"topic": "igwn.gwalert",
"uuid": "bc294578-895d-49ee-afc0-fc645987e392",
"title": "S250927cy - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250927cy/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S250927cy/view/"
},
"event": {
"far": 5.313349233749549e-08,
"time": "2025-09-27T17:30:41.678Z",
"group": "CBC",
"search": "AllSky",
"area_50": 140.68659727852184,
"area_90": 943.1562338060492,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
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},
"instruments": [
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"significant": true,
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"classification": {
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"BNS": 9.11377121582436e-21,
"NSBH": 6.810545383144578e-19,
"Terrestrial": 0.038481306746480315
},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2025-09-28T21:13:33Z",
"superevent_id": "S250927cy",
"external_coinc": null
},
"message_text": "",
"published": "2025-09-28T21:13:34.653289Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-09-28T21:13:34.653313Z",
"modified": "2025-09-28T21:13:34.667443Z"
}
}
],
"references": [
{
"id": 5785309,
"topic": "gcn.circulars",
"uuid": "dca48a99-c58e-45d9-ba40-805a431e8595",
"title": "LIGO/Virgo/KAGRA S250927cy: Identification of a GW compact binary merger candidate",
"submitter": "avanivikrambhai.patel@ligo.org",
"authors": "avanivikrambhai.patel@ligo.org",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/42016"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.42016....1L",
"eventId": "LIGO/Virgo/KAGRA S250927cy",
"subject": "LIGO/Virgo/KAGRA S250927cy: Identification of a GW compact binary merger candidate",
"createdOn": 1758996739301,
"submitter": "avanivikrambhai.patel@ligo.org",
"circularId": 42016,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250927cy during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-09-27 17:30:41.678 UTC (GPS time: 1443029459.678). The candidate was found by the Aframe [1], GstLAL [2], and MBTA [3] analysis pipelines.\n\nS250927cy is an event of interest because its false alarm rate, as estimated by the online analysis, is 5.3e-08 Hz, or about one in 7 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250927cy\n\nThe classification of the GW signal, in order of descending probability, is BBH (96%), Terrestrial (4%), NSBH (<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%. [4] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [4] 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%.\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 sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [5], distributed via GCN and SCiMMA notices about 28 seconds after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [5], 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,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 1551 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4064 +/- 1180 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] 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 [3] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [4] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [5] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
"published": "2025-10-06T08:09:22.614036Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-10-06T08:09:22.614047Z",
"modified": "2025-10-06T08:09:22.617710Z",
"targets": []
},
{
"id": 5785261,
"topic": "gcn.circulars",
"uuid": "0f1ed759-4d84-4e14-9378-7fcb109fd512",
"title": "LIGO/Virgo/KAGRA S250927cy: Updated Sky localization",
"submitter": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"authors": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/42022"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.42022....1L",
"eventId": "LIGO/Virgo/KAGRA S250927cy",
"subject": "LIGO/Virgo/KAGRA S250927cy: Updated Sky localization",
"createdOn": 1759094142937,
"submitter": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"circularId": 42022,
"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), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250927cy (GCN Circular 42016). 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/S250927cy\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 944 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4089 +/- 1482 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": "2025-10-06T08:09:14.044220Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-10-06T08:09:14.044231Z",
"modified": "2025-10-06T08:09:14.050043Z",
"targets": []
},
{
"id": 5782817,
"topic": "gcn.circulars",
"uuid": "cfb6fe1f-f46d-4f69-a113-48cfef43cf53",
"title": "LIGO/Virgo/KAGRA S250927cy: Updated Sky localization",
"submitter": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"authors": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/42022"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250927cy",
"subject": "LIGO/Virgo/KAGRA S250927cy: Updated Sky localization",
"createdOn": 1759094142937,
"submitter": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"circularId": 42022,
"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), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250927cy (GCN Circular 42016). 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/S250927cy\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 944 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4089 +/- 1482 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": "2025-09-28T21:15:52.127699Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-28T21:15:52.127724Z",
"modified": "2025-09-28T21:15:52.143522Z",
"targets": []
},
{
"id": 5782556,
"topic": "gcn.circulars",
"uuid": "88077ca1-809a-4eae-8830-5407e65cacc2",
"title": "LIGO/Virgo/KAGRA S250927cy: Identification of a GW compact binary merger candidate",
"submitter": "avanivikrambhai.patel@ligo.org",
"authors": "avanivikrambhai.patel@ligo.org",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/42016"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250927cy",
"subject": "LIGO/Virgo/KAGRA S250927cy: Identification of a GW compact binary merger candidate",
"createdOn": 1758996739301,
"submitter": "avanivikrambhai.patel@ligo.org",
"circularId": 42016,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250927cy during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-09-27 17:30:41.678 UTC (GPS time: 1443029459.678). The candidate was found by the Aframe [1], GstLAL [2], and MBTA [3] analysis pipelines.\n\nS250927cy is an event of interest because its false alarm rate, as estimated by the online analysis, is 5.3e-08 Hz, or about one in 7 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250927cy\n\nThe classification of the GW signal, in order of descending probability, is BBH (96%), Terrestrial (4%), NSBH (<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%. [4] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [4] 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%.\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 sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [5], distributed via GCN and SCiMMA notices about 28 seconds after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [5], 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,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 1551 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4064 +/- 1180 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] 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 [3] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [4] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [5] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
"published": "2025-09-27T18:12:28.981155Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-27T18:12:28.981176Z",
"modified": "2025-09-27T18:12:28.992246Z",
"targets": []
}
]
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"title": "S251006aw - PRELIMINARY",
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{
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"message": {
"id": 5785343,
"topic": "igwn.gwalert",
"uuid": "4a5bd712-c9d8-4221-a3a7-e82ed73b535d",
"title": "S251006az - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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}
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"topic": "igwn.gwalert",
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"title": "S251006bc - PRELIMINARY",
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