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{
"id": 5772554,
"topic": "gcn.circulars",
"uuid": "0b6cecf8-68d1-4e5b-99a1-50345bf6887b",
"title": "LIGO/Virgo/KAGRA S250802dn: Updated Sky localization",
"submitter": "lucy.thomas@ligo.org",
"authors": "lucy.thomas@ligo.org",
"data": {
"urls": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41220....1L",
"eventId": "LIGO/Virgo/KAGRA S250802dn",
"subject": "LIGO/Virgo/KAGRA S250802dn: Updated Sky localization",
"createdOn": 1754198325243,
"submitter": "lucy.thomas@ligo.org",
"circularId": 41220,
"submittedHow": "web"
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"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 LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S250802dn (GCN Circular 41218). 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/S250802dn\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3209 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3070 +/- 1219 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": "2025-08-25T08:08:52.678678Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-25T08:08:52.678695Z",
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{
"id": 5772540,
"topic": "gcn.circulars",
"uuid": "372be547-b32b-48bb-9b29-702b3fe25f18",
"title": "LIGO/Virgo/KAGRA S250802dn: Identification of a GW compact binary merger candidate",
"submitter": "nzhang352@gatech.edu",
"authors": "nzhang352@gatech.edu",
"data": {
"urls": {
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"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41218....1L",
"eventId": "LIGO/Virgo/KAGRA S250802dn",
"subject": "LIGO/Virgo/KAGRA S250802dn: Identification of a GW compact binary merger candidate",
"createdOn": 1754169216018,
"submitter": "nzhang352@gatech.edu",
"circularId": 41218,
"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 S250802dn during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2025-08-02 20:25:12.022 UTC (GPS time: 1438201530.022). The candidate was found by the cWB BBH [1], GstLAL [2], and MBTA [3] analysis pipelines.\n\nS250802dn is an event of interest because its false alarm rate, as estimated by the online analysis, is 5.5e-08 Hz, or about one in 6 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250802dn\n\nThe classification of the GW signal, in order of descending probability, is BBH (93%), Terrestrial (7%), BNS (<1%), or NSBH (<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\nThree 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 24 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 41 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 4470 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2957 +/- 1075 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] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\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": "2025-08-25T08:08:49.529973Z",
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"created": "2025-08-25T08:08:49.529985Z",
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"targets": []
},
{
"id": 2873276,
"topic": "gcn.circulars",
"uuid": "1fbda5ea-8b39-40f3-8f12-2b18626ce8ef",
"title": "LIGO/Virgo/KAGRA S250802dn: Updated Sky localization",
"submitter": "lucy.thomas@ligo.org",
"authors": "lucy.thomas@ligo.org",
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"subject": "LIGO/Virgo/KAGRA S250802dn: Updated Sky localization",
"createdOn": 1754198325243,
"submitter": "lucy.thomas@ligo.org",
"circularId": 41220,
"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 LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S250802dn (GCN Circular 41218). 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/S250802dn\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3209 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3070 +/- 1219 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": "2025-08-03T05:24:06.321041Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-03T05:24:06.321063Z",
"modified": "2025-08-03T05:24:06.771783Z",
"targets": []
},
{
"id": 2789608,
"topic": "gcn.circulars",
"uuid": "d9eefa5a-03e5-4cbe-a5f7-f712790b96bf",
"title": "LIGO/Virgo/KAGRA S250802dn: Identification of a GW compact binary merger candidate",
"submitter": "nzhang352@gatech.edu",
"authors": "nzhang352@gatech.edu",
"data": {
"urls": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250802dn",
"subject": "LIGO/Virgo/KAGRA S250802dn: Identification of a GW compact binary merger candidate",
"createdOn": 1754169216018,
"submitter": "nzhang352@gatech.edu",
"circularId": 41218,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250802dn during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2025-08-02 20:25:12.022 UTC (GPS time: 1438201530.022). The candidate was found by the cWB BBH [1], GstLAL [2], and MBTA [3] analysis pipelines.\n\nS250802dn is an event of interest because its false alarm rate, as estimated by the online analysis, is 5.5e-08 Hz, or about one in 6 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250802dn\n\nThe classification of the GW signal, in order of descending probability, is BBH (93%), Terrestrial (7%), BNS (<1%), or NSBH (<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\nThree 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 24 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 41 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 4470 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2957 +/- 1075 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] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\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": "2025-08-02T22:54:24.382185Z",
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"retracted": false,
"created": "2025-08-02T22:54:24.382197Z",
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}
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{
"event_id": "S250726ak",
"sequences": [],
"references": [
{
"id": 3073765,
"topic": "gcn.circulars",
"uuid": "8c9f672c-1198-450f-ad65-00c5e1bcea77",
"title": "LIGO/Virgo/KAGRA S250726ak: Identification of a GW compact binary merger candidate",
"submitter": "Cassius Melo at Universidade Federal de Alfenas - UNIFAL-MG <cassiusanderson.melo@ligo.org>",
"authors": "Cassius Melo at Universidade Federal de Alfenas - UNIFAL-MG <cassiusanderson.melo@ligo.org>",
"data": {
"urls": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41171....1L",
"eventId": "LIGO/Virgo/KAGRA S250726ak",
"subject": "LIGO/Virgo/KAGRA S250726ak: Identification of a GW compact binary merger candidate",
"createdOn": 1753521408063,
"submitter": "Cassius Melo at Universidade Federal de Alfenas - UNIFAL-MG <cassiusanderson.melo@ligo.org>",
"circularId": 41171,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250726ak during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-26 08:28:15.370 UTC (GPS time: 1437553713.370). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], PyCBC Live [5], and SPIIR [6] analysis pipelines.\n\nS250726ak is an event of interest because its false alarm rate, as estimated by the online analysis, is 4.7e-12 Hz, or about one in 1e4 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250726ak\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH (<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%. [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 <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,0, an initial localization generated by BAYESTAR [8], distributed via GCN and SCiMMA notices about 24 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 4 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 1027 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3384 +/- 1067 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] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004\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",
"published": "2025-08-04T08:08:58.134325Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-04T08:08:58.134337Z",
"modified": "2025-08-04T08:08:58.137818Z",
"targets": []
},
{
"id": 3073730,
"topic": "gcn.circulars",
"uuid": "5ceb1d64-4adc-4b83-a9bb-7af4bab0325c",
"title": "LIGO/Virgo/KAGRA S250726ak: Upper limits from Swift/BAT-GUANO",
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"authors": "Maia Williams at PSU <mjw6837@psu.edu>",
"data": {
"urls": {
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},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41204....1W",
"eventId": "LIGO/Virgo/KAGRA S250726ak",
"subject": "LIGO/Virgo/KAGRA S250726ak: Upper limits from Swift/BAT-GUANO",
"createdOn": 1753898220637,
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"circularId": 41204,
"submittedHow": "web"
},
"message_text": "Maia Williams (PSU), Samuele Ronchini (PSU), Gayathri Raman, James DeLaunay (PSU), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), Aaron Tohuvavohu (Caltech) report:\n\nSwift/BAT was observing 99.9% of the GW localization probability ([Bilby.multiorder.fits](https://gracedb.ligo.org/api/superevents/S250726ak/files/Bilby.multiorder.fits)) at merger time. A fraction 40.74% of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; [Tohuvavohu et al. 2020, ApJ, 900, 1](https://iopscience.iop.org/article/10.3847/1538-4357/aba94f)).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis ([DeLaunay + Tohuvavohu 2022, ApJ, 941, 169](https://iopscience.iop.org/article/10.3847/1538-4357/ac9d38)) we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\n|time_bin (s) |soft |normal|hard |GRB170817\n|-|-|-|-|-|\n|0.256 |12.10 |7.77 |6.83 |8.74 \n|1.024 |6.19 |3.97 |3.49 |4.46 \n|4.096 |3.34 |2.15 |1.89 |2.41 \n|16.384 |2.10 |1.35 |1.18 |1.51 \n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization: https://zenodo.org/records/16614782\n\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively. The corresponding fits file is also included.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/",
"published": "2025-08-04T08:08:52.775597Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-04T08:08:52.775608Z",
"modified": "2025-08-04T08:08:52.779170Z",
"targets": []
},
{
"id": 3073712,
"topic": "gcn.circulars",
"uuid": "9643a24c-ee94-4b27-ba4a-6466d8ce7e73",
"title": "LIGO/Virgo/KAGRA S250726ak: Updated Sky localization",
"submitter": "Lorenzo Pompili at Max Planck Institute for Gravitational Physics <lorenzo.pompili@aei.mpg.de>",
"authors": "Lorenzo Pompili at Max Planck Institute for Gravitational Physics <lorenzo.pompili@aei.mpg.de>",
"data": {
"urls": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41174....1L",
"eventId": "LIGO/Virgo/KAGRA S250726ak",
"subject": "LIGO/Virgo/KAGRA S250726ak: Updated Sky localization",
"createdOn": 1753612361056,
"submitter": "Lorenzo Pompili at Max Planck Institute for Gravitational Physics <lorenzo.pompili@aei.mpg.de>",
"circularId": 41174,
"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 S250726ak (GCN Circular 41171). 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/S250726ak\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 361 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3333 +/- 1448 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": "2025-08-04T08:08:51.582335Z",
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"retracted": false,
"created": "2025-08-04T08:08:51.582352Z",
"modified": "2025-08-04T08:08:51.586378Z",
"targets": []
},
{
"id": 2215809,
"topic": "gcn.circulars",
"uuid": "f0f4000b-0c65-401a-85a2-497730b0350b",
"title": "LIGO/Virgo/KAGRA S250726ak: Upper limits from Swift/BAT-GUANO",
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"authors": "Maia Williams at PSU <mjw6837@psu.edu>",
"data": {
"urls": {
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"format": "text/markdown",
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"eventId": "LIGO/Virgo/KAGRA S250726ak",
"subject": "LIGO/Virgo/KAGRA S250726ak: Upper limits from Swift/BAT-GUANO",
"createdOn": 1753898220637,
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"circularId": 41204,
"submittedHow": "web"
},
"message_text": "Maia Williams (PSU), Samuele Ronchini (PSU), Gayathri Raman, James DeLaunay (PSU), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), Aaron Tohuvavohu (Caltech) report:\n\nSwift/BAT was observing 99.9% of the GW localization probability ([Bilby.multiorder.fits](https://gracedb.ligo.org/api/superevents/S250726ak/files/Bilby.multiorder.fits)) at merger time. A fraction 40.74% of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; [Tohuvavohu et al. 2020, ApJ, 900, 1](https://iopscience.iop.org/article/10.3847/1538-4357/aba94f)).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis ([DeLaunay + Tohuvavohu 2022, ApJ, 941, 169](https://iopscience.iop.org/article/10.3847/1538-4357/ac9d38)) we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\n|time_bin (s) |soft |normal|hard |GRB170817\n|-|-|-|-|-|\n|0.256 |12.10 |7.77 |6.83 |8.74 \n|1.024 |6.19 |3.97 |3.49 |4.46 \n|4.096 |3.34 |2.15 |1.89 |2.41 \n|16.384 |2.10 |1.35 |1.18 |1.51 \n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization: https://zenodo.org/records/16614782\n\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively. The corresponding fits file is also included.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/",
"published": "2025-07-30T17:57:02.511426Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-30T17:57:02.511444Z",
"modified": "2025-07-30T17:57:02.517046Z",
"targets": []
}
]
},
{
"event_id": "S250727cl",
"sequences": [],
"references": [
{
"id": 3073767,
"topic": "gcn.circulars",
"uuid": "51097998-3912-4a0a-856a-00935313b60f",
"title": "LIGO/Virgo/KAGRA S250727cl: Identification of a GW compact binary merger candidate",
"submitter": "aubrey_laity@uri.edu",
"authors": "aubrey_laity@uri.edu",
"data": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41178....1L",
"eventId": "LIGO/Virgo/KAGRA S250727cl",
"subject": "LIGO/Virgo/KAGRA S250727cl: Identification of a GW compact binary merger candidate",
"createdOn": 1753642970092,
"submitter": "aubrey_laity@uri.edu",
"circularId": 41178,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250727cl during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-27 18:03:29.655 UTC (GPS time: 1437674627.655). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], MLy [5], PyCBC Live [6], and SPIIR [7] analysis pipelines.\n\nS250727cl is an event of interest because its false alarm rate, as estimated by the online analysis, is 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/S250727cl\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), BNS (<1%), NSBH (<1%), or Terrestrial (<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%. [8] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [8] 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,0, an initial localization generated by BAYESTAR [9], distributed via GCN and SCiMMA notices about 31 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [9], 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 379 deg^2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1817 +/- 454 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] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004\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] Skliris et al. PRD 110, 104034 (2024) doi:10.1103/PhysRevD.110.104034\n [6] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a\n [7] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023\n [8] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [9] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
"published": "2025-08-04T08:08:58.159728Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-04T08:08:58.159740Z",
"modified": "2025-08-04T08:08:58.163236Z",
"targets": []
},
{
"id": 3073722,
"topic": "gcn.circulars",
"uuid": "53598883-ec2a-430e-9fd7-32e89c4879db",
"title": "LIGO/Virgo/KAGRA S250727cl: Updated Sky localization",
"submitter": "Elise Sänger at Max Planck Institute for Gravitational Physics (AEI Potsdam) <elise.sanger@ligo.org>",
"authors": "Elise Sänger at Max Planck Institute for Gravitational Physics (AEI Potsdam) <elise.sanger@ligo.org>",
"data": {
"urls": {
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},
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"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41183....1L",
"eventId": "LIGO/Virgo/KAGRA S250727cl",
"subject": "LIGO/Virgo/KAGRA S250727cl: Updated Sky localization",
"createdOn": 1753696277958,
"submitter": "Elise Sänger at Max Planck Institute for Gravitational Physics (AEI Potsdam) <elise.sanger@ligo.org>",
"circularId": 41183,
"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 S250727cl (GCN Circular 41178). 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/S250727cl\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 205 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2152 +/- 515 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": "2025-08-04T08:08:51.684599Z",
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"retracted": false,
"created": "2025-08-04T08:08:51.684611Z",
"modified": "2025-08-04T08:08:51.689101Z",
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}
]
},
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"title": "S250810dh - PRELIMINARY",
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"time_created": "2025-08-10T23:52:38Z",
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"created": "2025-08-10T23:52:39.145903Z",
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{
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"published": "2025-08-11T19:52:03.080842Z",
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"created": "2025-08-11T19:52:03.080863Z",
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{
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"message": {
"id": 4839907,
"topic": "igwn.gwalert",
"uuid": "88ef02f2-1000-4970-8320-9b1819e9fdcc",
"title": "S250811k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"data": {
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},
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"sequence_num": 2,
"time_created": "2025-08-11T19:56:28Z",
"superevent_id": "S250811k",
"external_coinc": null
},
"message_text": "",
"published": "2025-08-11T22:21:10.863985Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-08-11T22:21:10.864015Z",
"modified": "2025-08-11T22:21:10.995471Z"
}
}
],
"references": []
},
{
"event_id": "S250725l",
"sequences": [
{
"id": 9372,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1850095,
"topic": "igwn.gwalert",
"uuid": "e39368df-4c73-4a35-9c26-61b625f852a5",
"title": "S250725l - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"duration": null,
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"classification": {
"BBH": 0.9969052950211541,
"BNS": 1.0186490039465266e-20,
"NSBH": 7.051000843704698e-19,
"Terrestrial": 0.003094704978845897
},
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},
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"sequence_num": 1,
"time_created": "2025-07-25T04:21:22Z",
"superevent_id": "S250725l",
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},
"message_text": "",
"published": "2025-07-25T06:11:24.991577Z",
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"created": "2025-07-25T06:11:24.991613Z",
"modified": "2025-07-25T06:11:25.009092Z"
}
},
{
"id": 9374,
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"sequence_type": "INITIAL",
"message": {
"id": 1889783,
"topic": "igwn.gwalert",
"uuid": "9d2c7a67-b9b9-4ae1-87df-3009a1212272",
"title": "S250725l - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S250725l/view/"
},
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"time": "2025-07-25T04:20:50.940Z",
"group": "CBC",
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"duration": null,
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"title": "S250725l - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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},
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"references": [
{
"id": 3073784,
"topic": "gcn.circulars",
"uuid": "0e6895a4-1ae4-493d-900d-8172af8ca6ef",
"title": "LIGO/Virgo/KAGRA S250725l: Upper limits from Swift/BAT-GUANO",
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"authors": "Maia Williams at PSU <mjw6837@psu.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41203"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41203....1W",
"eventId": "LIGO/Virgo/KAGRA S250725l",
"subject": "LIGO/Virgo/KAGRA S250725l: Upper limits from Swift/BAT-GUANO",
"createdOn": 1753898040025,
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"circularId": 41203,
"submittedHow": "web"
},
"message_text": "Maia Williams (PSU), Samuele Ronchini (PSU), Gayathri Raman, James DeLaunay (PSU), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), Aaron Tohuvavohu (Caltech) report:\n\nSwift/BAT was observing 100.0% of the GW localization probability ([Bilby.offline0.multiorder.fits](https://gracedb.ligo.org/api/superevents/S250725l/files/Bilby.offline0.multiorder.fits)) at merger time. A fraction 38.64% of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; [Tohuvavohu et al. 2020, ApJ, 900, 1](https://iopscience.iop.org/article/10.3847/1538-4357/aba94f)).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis ([DeLaunay + Tohuvavohu 2022, ApJ, 941, 169](https://iopscience.iop.org/article/10.3847/1538-4357/ac9d38)) we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\n|time_bin (s) |soft |normal|hard |GRB170817\n|-|-|-|-|-|\n|0.256 |9.96 |6.98 |6.25 |7.72 \n|1.024 |5.08 |3.56 |3.19 |3.94 \n|4.096 |2.74 |1.92 |1.72 |2.13 \n|16.384 |1.71 |1.20 |1.08 |1.33 \n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization: https://zenodo.org/records/16614280\n\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively. The corresponding fits file is also included.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/",
"published": "2025-08-04T08:08:59.324365Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-04T08:08:59.324377Z",
"modified": "2025-08-04T08:08:59.327988Z",
"targets": []
},
{
"id": 3073734,
"topic": "gcn.circulars",
"uuid": "7b19e3f8-668a-4af3-8ff1-47f124f012f2",
"title": "LIGO/Virgo/KAGRA S250725l: Updated Sky localization",
"submitter": "Lorenzo Pompili at Max Planck Institute for Gravitational Physics <lorenzo.pompili@aei.mpg.de>",
"authors": "Lorenzo Pompili at Max Planck Institute for Gravitational Physics <lorenzo.pompili@aei.mpg.de>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41175"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41175....1L",
"eventId": "LIGO/Virgo/KAGRA S250725l",
"subject": "LIGO/Virgo/KAGRA S250725l: Updated Sky localization",
"createdOn": 1753614368001,
"submitter": "Lorenzo Pompili at Max Planck Institute for Gravitational Physics <lorenzo.pompili@aei.mpg.de>",
"circularId": 41175,
"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 S250725l (GCN Circular 41155). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN and SCiMMA notices, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S250725l\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 1532 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2567 +/- 766 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": "2025-08-04T08:08:52.813273Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-04T08:08:52.813286Z",
"modified": "2025-08-04T08:08:52.816764Z",
"targets": []
},
{
"id": 2215438,
"topic": "gcn.circulars",
"uuid": "fa756e1f-fb20-4652-bd2b-90387d2e620a",
"title": "LIGO/Virgo/KAGRA S250725l: Upper limits from Swift/BAT-GUANO",
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"authors": "Maia Williams at PSU <mjw6837@psu.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41203"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725l",
"subject": "LIGO/Virgo/KAGRA S250725l: Upper limits from Swift/BAT-GUANO",
"createdOn": 1753898040025,
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"circularId": 41203,
"submittedHow": "web"
},
"message_text": "Maia Williams (PSU), Samuele Ronchini (PSU), Gayathri Raman, James DeLaunay (PSU), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), Aaron Tohuvavohu (Caltech) report:\n\nSwift/BAT was observing 100.0% of the GW localization probability ([Bilby.offline0.multiorder.fits](https://gracedb.ligo.org/api/superevents/S250725l/files/Bilby.offline0.multiorder.fits)) at merger time. A fraction 38.64% of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; [Tohuvavohu et al. 2020, ApJ, 900, 1](https://iopscience.iop.org/article/10.3847/1538-4357/aba94f)).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis ([DeLaunay + Tohuvavohu 2022, ApJ, 941, 169](https://iopscience.iop.org/article/10.3847/1538-4357/ac9d38)) we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\n|time_bin (s) |soft |normal|hard |GRB170817\n|-|-|-|-|-|\n|0.256 |9.96 |6.98 |6.25 |7.72 \n|1.024 |5.08 |3.56 |3.19 |3.94 \n|4.096 |2.74 |1.92 |1.72 |2.13 \n|16.384 |1.71 |1.20 |1.08 |1.33 \n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization: https://zenodo.org/records/16614280\n\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively. The corresponding fits file is also included.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/",
"published": "2025-07-30T17:54:00.933005Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-30T17:54:00.933019Z",
"modified": "2025-07-30T17:54:00.938333Z",
"targets": []
},
{
"id": 1966872,
"topic": "gcn.circulars",
"uuid": "3f4c8b48-1930-4e1a-aa79-84a7ba277031",
"title": "LIGO/Virgo/KAGRA S250725l: Identification of a GW compact binary merger candidate (duplicate submission)",
"submitter": "Junjie Zhao at Henan Academy of Sciences <junjiezhao@hnas.ac.cn>",
"authors": "Junjie Zhao at Henan Academy of Sciences <junjiezhao@hnas.ac.cn>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41156"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725l",
"subject": "LIGO/Virgo/KAGRA S250725l: Identification of a GW compact binary merger candidate (duplicate submission)",
"version": 2,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
"editedOn": 1753450461819,
"createdOn": 1753419290597,
"submitter": "Junjie Zhao at Henan Academy of Sciences <junjiezhao@hnas.ac.cn>",
"circularId": 41156,
"submittedHow": "web"
},
"message_text": "This is a duplicate of GCN Circular 41155.",
"published": "2025-07-25T16:01:53.620429Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-25T16:01:53.620445Z",
"modified": "2025-07-25T16:01:53.625787Z",
"targets": []
},
{
"id": 1850098,
"topic": "gcn.circulars",
"uuid": "d225e001-2175-4569-b4e1-a24547da19aa",
"title": "LIGO/Virgo/KAGRA S250725l: Identification of a GW compact binary merger candidate",
"submitter": "Kiet Pham <kiet.pham@ligo.org>",
"authors": "Kiet Pham <kiet.pham@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41155"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725l",
"subject": "LIGO/Virgo/KAGRA S250725l: Identification of a GW compact binary merger candidate",
"createdOn": 1753419222054,
"submitter": "Kiet Pham <kiet.pham@ligo.org>",
"circularId": 41155,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250725l during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-25 04:20:50.940 UTC (GPS time: 1437452468.940). The candidate was found by the GstLAL [1], MBTA [2], and PyCBC Live [3] analysis pipelines.\n\nS250725l is an event of interest because its false alarm rate, as estimated by the online analysis, is 3e-08 Hz, or about one in 1 year, 23 days. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250725l\n\nThe classification of the GW signal, in order of descending probability, is BBH (99%), Terrestrial (1%), BNS (<1%), or NSBH (<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 (11.0, 22.0) 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 31 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 1990 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2186 +/- 673 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] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [3] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a\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": "2025-07-25T06:11:25.088693Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-25T06:11:25.088722Z",
"modified": "2025-07-25T06:11:25.092886Z",
"targets": []
},
{
"id": 1850062,
"topic": "gcn.circulars",
"uuid": "0ec886f1-2f6d-43af-a822-febd51b286db",
"title": "LIGO/Virgo/KAGRA S250725l: Identification of a GW compact binary merger candidate",
"submitter": "Junjie Zhao at Henan Academy of Sciences <junjiezhao@hnas.ac.cn>",
"authors": "Junjie Zhao at Henan Academy of Sciences <junjiezhao@hnas.ac.cn>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41156"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725l",
"subject": "LIGO/Virgo/KAGRA S250725l: Identification of a GW compact binary merger candidate",
"createdOn": 1753419290597,
"submitter": "Junjie Zhao at Henan Academy of Sciences <junjiezhao@hnas.ac.cn>",
"circularId": 41156,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250725l during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-25 04:20:50.940 UTC (GPS time: 1437452468.940). The candidate was found by the GstLAL [1], MBTA [2], and PyCBC Live [3] analysis pipelines.\n\nS250725l is an event of interest because its false alarm rate, as estimated by the online analysis, is 3e-08 Hz, or about one in 1 year, 23 days. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250725l\n\nThe classification of the GW signal, in order of descending probability, is BBH (99%), Terrestrial (1%), BNS (<1%), or NSBH (<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 (11.0, 22.0) 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 31 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 1990 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2186 +/- 673 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] Allene et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [3] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a\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",
"published": "2025-07-25T06:11:24.120515Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-25T06:11:24.120551Z",
"modified": "2025-07-25T06:11:24.125574Z",
"targets": []
}
]
},
{
"event_id": "S250813k",
"sequences": [
{
"id": 9714,
"sequence_number": 1,
"sequence_type": "INITIAL",
"message": {
"id": 5102542,
"topic": "igwn.gwalert",
"uuid": "cbbd8172-5ab8-4989-8474-dbf1cd3b7f2c",
"title": "S250813k - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S250813k/view/"
},
"event": {
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"time": "2025-08-13T02:12:00.444Z",
"group": "CBC",
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"area_50": 5.609497761548074,
"area_90": 18.00547148242082,
"duration": null,
"pipeline": "spiir",
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},
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"V1"
],
"significant": true,
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"classification": {
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"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.0029106779952848827
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 1,
"time_created": "2025-08-13T02:27:16Z",
"superevent_id": "S250813k",
"external_coinc": null
},
"message_text": "",
"published": "2025-08-13T04:52:14.518336Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-08-13T04:52:14.518354Z",
"modified": "2025-08-13T04:52:14.521888Z"
}
},
{
"id": 9715,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 5102543,
"topic": "igwn.gwalert",
"uuid": "206e177e-8475-4578-9333-4db668795a78",
"title": "S250813k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250813k/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250813k/view/"
},
"event": {
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"duration": null,
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"properties": {
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},
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"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-08-13T02:17:01Z",
"superevent_id": "S250813k",
"external_coinc": null
},
"message_text": "",
"published": "2025-08-13T04:52:14.572803Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-08-13T04:52:14.572823Z",
"modified": "2025-08-13T04:52:14.576559Z"
}
},
{
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"sequence_type": "PRELIMINARY",
"message": {
"id": 5112383,
"topic": "igwn.gwalert",
"uuid": "363f27a5-7478-4406-9c07-bd4a33aacb02",
"title": "S250813k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250813k/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250813k/view/"
},
"event": {
"far": 1.109290525342232e-46,
"time": "2025-08-13T02:12:00.445Z",
"group": "CBC",
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"NSBH": 2.8658276680666367e-98,
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},
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"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 3,
"time_created": "2025-08-13T02:12:25Z",
"superevent_id": "S250813k",
"external_coinc": null
},
"message_text": "",
"published": "2025-08-13T04:53:30.701862Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-08-13T04:53:30.701888Z",
"modified": "2025-08-13T04:53:30.705634Z"
}
},
{
"id": 9764,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 5324400,
"topic": "igwn.gwalert",
"uuid": "d9d69ff9-74c7-495c-b883-ebe60f921f82",
"title": "S250813k - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250813k/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S250813k/view/"
},
"event": {
"far": 1.260539034264596e-10,
"time": "2025-08-13T02:12:00.444Z",
"group": "CBC",
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"duration": null,
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],
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},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2025-08-13T21:52:29Z",
"superevent_id": "S250813k",
"external_coinc": null
},
"message_text": "",
"published": "2025-08-13T23:39:17.521060Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-08-13T23:39:17.521079Z",
"modified": "2025-08-13T23:39:17.524857Z"
}
}
],
"references": [
{
"id": 5776738,
"topic": "gcn.circulars",
"uuid": "13090a8c-f983-416b-b2e5-d42424d6a93c",
"title": "LIGO/Virgo/KAGRA S250813k: Swift XRT observations, 2 X-ray sources",
"submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41384"
},
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41384....1P",
"eventId": "LIGO/Virgo/KAGRA S250813k",
"subject": "LIGO/Virgo/KAGRA S250813k: Swift XRT observations, 2 X-ray sources",
"createdOn": 1755242766104,
"submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"circularId": 41384,
"submittedHow": "email"
},
"message_text": "K.L. Page (U. Leicester), P.A. Evans (U. Leicester), J.A. Kennea (PSU), A.\nTohuvavohu (U. Toronto), S.B. Cenko (NASA/GSFC), R.A.J. Eyles-Ferris (U. Leicester),\nA.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), A.A. Breeveld (UCL-MSSL),\nS. Campana (INAF-OAB), J.J. Delaunay (PSU), M. De Pasquale (University of Messina),\nS. Dichiara (PSU), P. D’Avanzo (INAF-OAB), A. D’Aì (INAF-IASFPA) , V. D’Elia\n(ASI-SSDC & INAF-OAR), C. Gronwall (PSU), D. Hartmann (Clemson University), N.\nKlingler (NASA-GSFC / UMBC / CRESST II), N.P.M. Kuin (UCL-MSSL), S. Laha\n(NASA/GSFC), S.R. Oates (U. Birmingham), J.P. Osborne (U. Leicester), P. O’Brien\n(U. Leicester), M.J. Page (UCL-MSSL), G. Raman (PSU) S. Ronchini (PSU), T. Sbarrato\n(INAF-OAB), B. Sbarufatti (INAF-OAB), M.H. Siegel (PSU), G. Tagliaferri (INAF-OAB),\nE. Troja (U Tor Vergata, INAF) report on behalf of the Swift team:\n\nSwift has carried out 109 observations of the LVK error region for the GW trigger\nS250813k convolved with the 2MPZ catalogue (Bilicki et al. 2014, ApJS, 210, 9),\nusing the 'BAYESTAR' (version BAYESTAR.fits.gz) GW localisation map. As this is a 3D\nskymap, galaxy distances were taken into account in selecting which ones to observe.\nThe observations currently span from 2.0 ks to 164 ks after the LVK trigger, and the\nXRT has covered 7.9 deg^2 on the sky (corrected for overlaps). This covers 70% of\nthe probability in the 'ligo-skymap-from-samples' (version\nligo-skymap-from-samples.fits.gz) skymap, and 71% after convolving with the 2MPZ\ngalaxy catalogue, as described by Evans et al. (2016, MNRAS, 462, 1591).\n\nWe have detected 2 X-ray sources. Each source is assigned a rank of 1-4 which\ndescribes how likely it is to be related to the GW trigger, with 1 being the most\nlikely and 4 being the least likely. The ranks are described at\nhttps://www.swift.ac.uk/ranks.php.\n\nWe have found:\n\n * 0 sources of rank 1\n * 0 sources of rank 2\n * 1 source of rank 3\n * 1 source of rank 4\n\n\nRANK 3 sources\n==============\n\nThese are uncatalogued X-ray sources, however they are not brighter than previous\nupper limits, so do not stand out as likely counterparts to the GW trigger.\n\n| Source ID\t | RA\t\t | Dec \t | Err90 | Detection Flag\t|\n| S250813k_X12 | 08h 54m 56.80s | +71d 23' 19.9\" |\t8.3\" |\t\t GOOD |\n\n\nRANK 4 sources\n==============\n\nThese are catalogued X-ray sources, showing no signs of outburst compared to\nprevious observations, so they are not likely to be related to the GW trigger.\n\n| Source ID\t | RA\t\t | Dec \t | Err90 | Detection Flag\t|\n| S250813k_X11 | 09h 17m 14.09s | +75d 30' 53.0\" |\t7.1\" |\t\t GOOD |\n\nFor all flux conversions and comparisons with catalogues and upper limits from other\nmissions, we assumed a power-law spectrum with NH=3x10^20 cm^-2, and photon index\n(Gamma)=1.7, unless otherwise stated.\n\nThe results of the XRT automated analysis, including details of the sources listed\nabove, are online at https://www.swift.ac.uk/LVC/S250813k\n\nThis circular is an official product of the Swift XRT team.\n\n\n",
"published": "2025-09-08T08:08:56.826692Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-08T08:08:56.826713Z",
"modified": "2025-09-08T08:08:56.830776Z",
"targets": []
},
{
"id": 5776692,
"topic": "gcn.circulars",
"uuid": "105bcec4-e403-45b2-b30f-7b8889f407d5",
"title": "LIGO/Virgo/KAGRA S250813k: NED Galaxies in the 4-Update Localization Volume",
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"authors": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41351"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41351....1C",
"eventId": "LIGO/Virgo/KAGRA S250813k",
"subject": "LIGO/Virgo/KAGRA S250813k: NED Galaxies in the 4-Update Localization Volume",
"createdOn": 1755125101841,
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"circularId": 41351,
"submittedHow": "web"
},
"message_text": "David O. Cook (Caltech/IPAC), Rick Ebert (Caltech/IPAC), George Helou (Caltech/IPAC), Joseph M. Mazzarella (Caltech/IPAC), Marion Schmitz (Caltech/IPAC), and Leo Singer (NASA/GSFC)\n\nOn behalf of the NASA/IPAC Extragalactic Database (NED) Team.\n\nWe spatially cross-matched the LVK S250813k-4-Update sky localization with the NED Local Volume Sample (NED-LVS; Cook et al. 2023), which is a subset of NED with a redshift or redshift-independent distance less than 1000 Mpc. We find 155 galaxies within the 90% containment volume, and we list here the top 20 galaxies sorted by the joint probability of the 3D localization and the WISE W1 luminosity (an observable proxy for stellar mass). For the full or top 20 list of galaxies in the 90% volume go either to the NED Gravitational Wave Followup service at https://ned.ipac.caltech.edu/uri/NED::GWF/ or click on the following links:\n\nFull List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250813k/4 \nTop 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250813k/4/20\n\nThe NED-GWF service provides downloadable galaxy lists and visualizations for candidate host galaxies. For each GW alert, these products are automatically generated and made available within minutes to expedite efficient electromagnetic follow-up observations. The NED top 20 list is sorted by the joint probability of the 3D localization and the WISE W1 luminosity, but users can sort on additional pre-computed prioritization metrics (star formation rate, P_3D * P_SFR; and specific star formation rate, P_3D * P_sSFR; etc.) which are available via downloading the entire galaxy list inside the event's probability volume.\n\n| objname| ra| dec|objtype| DistMpc|DistMpc_unc| m_NUV| m_NUV_unc| m_Ks| m_Ks_unc| m_W1| m_W1_unc| P_3D|P_3D_LumW1|\n|-------------------------|--------------|--------------|-------|-----------|-----------|------------|------------|------------|------------|------------|------------|--------|----------|\n|WISEA J091600.60+754837.0| 139.00362| 75.80978| G| 743.12| null| null| null| 12.790| 0.114| 11.225| 0.006|1.02e-06| 6.45e-08|\n|WISEA J085943.95+740702.1| 134.93483| 74.11685| G| 744.63| null| null| null| 13.083| 0.113| 12.827| 0.010|3.05e-06| 4.44e-08|\n|WISEA J090329.43+731952.8| 135.87263| 73.33136| G| 769.02| null| null| null| 13.434| 0.144| 12.868| 0.010|2.18e-06| 3.25e-08|\n|WISEA J090156.31+745448.6| 135.48465| 74.91352| G| 608.62| null| null| null| 13.563| 0.165| 13.395| 0.025|5.01e-06| 2.88e-08|\n|WISEA J090057.52+734556.4| 135.23969| 73.76568| G| 531.03| null| null| null| 12.743| 0.128| 12.700| 0.011|3.30e-06| 2.75e-08|\n|WISEA J085751.67+730314.9| 134.46530| 73.05415| G| 560.91| null| 20.368| 0.159| 13.715| 0.146| 12.494| 0.013|2.36e-06| 2.65e-08|\n|WISEA J091306.11+753712.2| 138.27548| 75.62007| G| 501.03| null| null| null| 12.896| 0.123| 12.393| 0.009|2.67e-06| 2.62e-08|\n|WISEA J085557.92+730643.9| 133.99135| 73.11222| G| 729.14| null| null| null| 13.591| 0.164| 13.317| 0.012|2.84e-06| 2.53e-08|\n|WISEA J090309.87+740351.7| 135.79113| 74.06438| G| 690.65| null| null| null| 13.836| 0.169| 13.566| 0.025|4.00e-06| 2.53e-08|\n|WISEA J090722.74+745314.9| 136.84477| 74.88750| G| 560.31| null| null| null| 13.366| 0.150| 13.349| 0.025|4.85e-06| 2.47e-08|\n|WISEA J090920.49+732006.8| 137.33539| 73.33525| G| 649.99| null| null| null| 13.738| 0.164| 12.081| 0.010|1.11e-06| 2.44e-08|\n|WISEA J085409.21+730852.6| 133.53838| 73.14795| G| 890.70| null| null| null| 13.089| 0.117| 12.653| 0.012|9.25e-07| 2.28e-08|\n|WISEA J090616.44+751235.5| 136.56851| 75.20987| G| 653.18| null| null| null| 13.689| 0.176| 13.670| 0.028|4.42e-06| 2.27e-08|\n|WISEA J090229.38+732949.1| 135.62244| 73.49698| G| 623.66| null| 20.646| 0.194| 13.692| 0.161| 13.281| 0.013|3.29e-06| 2.21e-08|\n|WISEA J090910.90+751628.1| 137.29543| 75.27447| G| 637.20| null| null| null| 13.552| 0.144| 13.679| 0.022|4.28e-06| 2.08e-08|\n|WISEA J090759.32+734442.1| 136.99718| 73.74504| G| 667.18| null| null| null| 13.483| 0.149| 13.309| 0.013|2.68e-06| 2.01e-08|\n|WISEA J091645.14+761451.5| 139.18812| 76.24766| G| 579.30| null| null| null| 13.414| 0.194| 13.098| 0.015|2.81e-06| 1.93e-08|\n|WISEA J085617.59+731958.6| 134.07330| 73.33295| G| 601.79| null| null| null| 13.364| 0.135| 13.299| 0.012|2.78e-06| 1.71e-08|\n|WISEA J090653.45+762059.4| 136.72274| 76.34984| G| 699.37| null| null| null| 13.345| 0.179| 12.327| 0.010|8.26e-07| 1.68e-08|\n|WISEA J085525.06+732139.9| 133.85446| 73.36109| G| 552.18| null| null| null| 13.243| 0.122| 12.856| 0.014|2.06e-06| 1.61e-08|\n\nTable 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250813k sorted by the joint probability of 3D position and WISE W1 luminosity (P_3D * P_LumW1). Galaxy is the NED preferred name. RA and Dec are the Equatorial coordinates in degrees (J2000). Objtype is the object type of the galaxy candidate. Distance is the distance to the galaxy in Mpc. m_NUV and mErr_NUV are the apparent magnitude and error from GALEX. m_Ks and mErr_Ks are the apparent magnitude and error from 2MASS. m_W1 and mErr_W1 are the apparent magnitude and error from AllWISE. P_3D is the probability that the galaxy is in the volume given the distance of GW event. P_3D_LumW1 is the joint probability within the volume weighted by the WISE1 luminosity of the galaxy (P_3D * P_LumW1). \n",
"published": "2025-09-08T08:08:49.196838Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-08T08:08:49.196856Z",
"modified": "2025-09-08T08:08:49.201147Z",
"targets": []
},
{
"id": 5776526,
"topic": "gcn.circulars",
"uuid": "63d6310a-f82d-49b6-ac98-42d72195432e",
"title": "LIGO/Virgo/KAGRA S250813k: Updated Sky localization",
"submitter": "Sylvia Biscoveanu at Northwestern CIERA <sylvia.biscoveanu@ligo.org>",
"authors": "Sylvia Biscoveanu at Northwestern CIERA <sylvia.biscoveanu@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41350"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41350....1L",
"eventId": "LIGO/Virgo/KAGRA S250813k",
"subject": "LIGO/Virgo/KAGRA S250813k: Updated Sky localization",
"createdOn": 1755122157275,
"submitter": "Sylvia Biscoveanu at Northwestern CIERA <sylvia.biscoveanu@ligo.org>",
"circularId": 41350,
"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 S250813k (GCN Circular 41336). 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/S250813k\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 13 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(09h02m, +74d05m, 3.72d, 1.09d, 106.41d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 708 +/- 159 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": "2025-09-08T08:08:37.796733Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-08T08:08:37.796752Z",
"modified": "2025-09-08T08:08:37.800848Z",
"targets": []
},
{
"id": 5776524,
"topic": "gcn.circulars",
"uuid": "1bc2b793-51be-40b0-b2cb-88694d3f0bf3",
"title": "LIGO/Virgo/KAGRA S250813k: Identification of a GW compact binary merger candidate",
"submitter": "neil.lu@ligo.org",
"authors": "neil.lu@ligo.org",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41336"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41336....1L",
"eventId": "LIGO/Virgo/KAGRA S250813k",
"subject": "LIGO/Virgo/KAGRA S250813k: Identification of a GW compact binary merger candidate",
"createdOn": 1755052598189,
"submitter": "neil.lu@ligo.org",
"circularId": 41336,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250813k during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-08-13 02:12:00.444 UTC (GPS time: 1439086338.444). The candidate was found by the cWB [1], GstLAL [2], MBTA [3], MLy [4], PyCBC Live [5], and SPIIR [6] analysis pipelines.\n\nS250813k is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.3e-10 Hz, or about one in 1e2 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250813k\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH (<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%. [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 <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,0, an initial localization generated by BAYESTAR [8], distributed via GCN and SCiMMA notices about 24 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 well fit by an ellipse with an area of 21 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(09h01m, +73d31m, 5.03d, 1.32d, 107.20d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 932 +/- 209 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] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004\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] Skliris et al. PRD 110, 104034 (2024) doi:10.1103/PhysRevD.110.104034\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.93.0240\n",
"published": "2025-09-08T08:08:37.762804Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-08T08:08:37.762820Z",
"modified": "2025-09-08T08:08:37.766852Z",
"targets": []
}
]
},
{
"event_id": "S250804ar",
"sequences": [
{
"id": 9537,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 3087510,
"topic": "igwn.gwalert",
"uuid": "674ddc71-29e6-4975-b32a-72a316bfe395",
"title": "S250804ar - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250804ar/view/"
},
"event": {
"far": 2.2482783602479774e-05,
"time": "2025-08-04T09:22:34.773Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7274.158023045185,
"area_90": 22714.643213995023,
"duration": 0.1875,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f02a95a3a8d7cdd676862de4c0cd958c",
"classification": {},
"skymap_version": 0,
"central_frequency": 40.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-08-04T09:23:23Z",
"superevent_id": "S250804ar",
"external_coinc": null
},
"message_text": "",
"published": "2025-08-04T09:23:24.858432Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-08-04T09:23:24.858453Z",
"modified": "2025-08-04T09:23:24.864804Z"
}
},
{
"id": 9538,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 3088357,
"topic": "igwn.gwalert",
"uuid": "44e02151-0c1f-4c5c-9ca9-7abe83483d65",
"title": "S250804ar - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250804ar/view/"
},
"event": {
"far": 2.2482783602479774e-05,
"time": "2025-08-04T09:22:34.773Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7274.158023045185,
"area_90": 22714.643213995023,
"duration": 0.1875,
"pipeline": "MLy",
"properties": {},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "f02a95a3a8d7cdd676862de4c0cd958c",
"classification": {},
"skymap_version": 0,
"central_frequency": 40.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-08-04T09:27:58Z",
"superevent_id": "S250804ar",
"external_coinc": null
},
"message_text": "",
"published": "2025-08-04T09:27:58.802515Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-08-04T09:27:58.802534Z",
"modified": "2025-08-04T09:27:58.806348Z"
}
}
],
"references": []
},
{
"event_id": "S250804bw",
"sequences": [
{
"id": 9539,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 3140521,
"topic": "igwn.gwalert",
"uuid": "6ba05775-9f63-4aa5-bebb-a8a8e71c9f64",
"title": "S250804bw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250804bw/view/"
},
"event": {
"far": 1.3159416164499726e-05,
"time": "2025-08-04T14:10:44.177Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7323.676348112644,
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