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{
"id": 421184,
"topic": "gcn.circulars",
"uuid": "cee92046-f590-4bd2-b111-de191fca4d55",
"title": "LIGO/Virgo/KAGRA S250705cb: 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/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41034....1L",
"eventId": "LIGO/Virgo/KAGRA S250705cb",
"subject": "LIGO/Virgo/KAGRA S250705cb: Updated Sky localization",
"createdOn": 1751990580387,
"submitter": "lucy.thomas@ligo.org",
"circularId": 41034,
"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 S250705cb (GCN Circular 40980). 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/S250705cb\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 333 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1143 +/- 299 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": "2025-07-14T08:08:38.523962Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:08:38.523974Z",
"modified": "2025-07-14T08:08:38.527157Z",
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{
"id": 421051,
"topic": "gcn.circulars",
"uuid": "d2513e4c-bd53-4478-9d39-a4853de203e1",
"title": "LIGO/Virgo/KAGRA S250705cb: Identification of a GW compact binary merger candidate",
"submitter": "Mayara Hilgert Pacheco at LIGO <mayara.pacheco@inpe.br>",
"authors": "Mayara Hilgert Pacheco at LIGO <mayara.pacheco@inpe.br>",
"data": {
"urls": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.40980....1L",
"eventId": "LIGO/Virgo/KAGRA S250705cb",
"subject": "LIGO/Virgo/KAGRA S250705cb: Identification of a GW compact binary merger candidate",
"createdOn": 1751734715486,
"submitter": "Mayara Hilgert Pacheco at LIGO <mayara.pacheco@inpe.br>",
"circularId": 40980,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250705cb during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-05 16:29:56.842 UTC (GPS time: 1435768214.842). The candidate was found by the GstLAL [1], MBTA [2], and PyCBC Live [3] analysis pipelines.\n\nS250705cb is an event of interest because its false alarm rate, as estimated by the online analysis, is 9.5e-10 Hz, or about one in 33 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250705cb\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 (5.5, 11.0) solar masses, assuming the candidate is astrophysical in origin.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [5], distributed via GCN and SCiMMA notices about 27 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [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 510 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1209 +/- 336 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": "2025-07-14T08:07:55.864163Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:07:55.864176Z",
"modified": "2025-07-14T08:07:55.867459Z",
"targets": []
},
{
"id": 384245,
"topic": "gcn.circulars",
"uuid": "af2fb30b-e418-4d71-afad-6a78abe5df35",
"title": "LIGO/Virgo/KAGRA S250705cb: Updated Sky localization",
"submitter": "lucy.thomas@ligo.org",
"authors": "lucy.thomas@ligo.org",
"data": {
"urls": {
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},
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"eventId": "LIGO/Virgo/KAGRA S250705cb",
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"createdOn": 1751990580387,
"submitter": "lucy.thomas@ligo.org",
"circularId": 41034,
"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 S250705cb (GCN Circular 40980). 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/S250705cb\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 333 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1143 +/- 299 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": "2025-07-08T16:03:01.389886Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-08T16:03:01.389904Z",
"modified": "2025-07-08T16:03:01.405028Z",
"targets": []
},
{
"id": 365232,
"topic": "gcn.circulars",
"uuid": "f017d712-a2a1-4c00-98d3-0610a934b2dd",
"title": "LIGO/Virgo/KAGRA S250705cb: Identification of a GW compact binary merger candidate",
"submitter": "Mayara Hilgert Pacheco at LIGO <mayara.pacheco@inpe.br>",
"authors": "Mayara Hilgert Pacheco at LIGO <mayara.pacheco@inpe.br>",
"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 S250705cb",
"subject": "LIGO/Virgo/KAGRA S250705cb: Identification of a GW compact binary merger candidate",
"createdOn": 1751734715486,
"submitter": "Mayara Hilgert Pacheco at LIGO <mayara.pacheco@inpe.br>",
"circularId": 40980,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250705cb during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-05 16:29:56.842 UTC (GPS time: 1435768214.842). The candidate was found by the GstLAL [1], MBTA [2], and PyCBC Live [3] analysis pipelines.\n\nS250705cb is an event of interest because its false alarm rate, as estimated by the online analysis, is 9.5e-10 Hz, or about one in 33 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250705cb\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 (5.5, 11.0) solar masses, assuming the candidate is astrophysical in origin.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [5], distributed via GCN and SCiMMA notices about 27 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [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 510 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1209 +/- 336 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",
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"title": "LIGO/Virgo/KAGRA S250705cb: Identification of a GW compact binary merger candidate",
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"authors": "Mayara Hilgert Pacheco at LIGO <mayara.pacheco@inpe.br>",
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"subject": "LIGO/Virgo/KAGRA S250705cb: Identification of a GW compact binary merger candidate",
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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 S250705cb during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-05 16:29:56.842 UTC (GPS time: 1435768214.842). The candidate was found by the GstLAL [1], MBTA [2], and PyCBC Live [3] analysis pipelines.\n\nS250705cb is an event of interest because its false alarm rate, as estimated by the online analysis, is 9.5e-10 Hz, or about one in 33 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250705cb\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 (5.5, 11.0) solar masses, assuming the candidate is astrophysical in origin.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [5], distributed via GCN and SCiMMA notices about 27 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [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 510 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1209 +/- 336 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",
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"title": "S250704ab - PRELIMINARY",
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"data": {
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{
"id": 421296,
"topic": "gcn.circulars",
"uuid": "e7ed3ba5-5d99-414a-81ce-991b66273193",
"title": "LIGO/Virgo/KAGRA S250704ab: Updated Sky localization and EM Bright Classification",
"submitter": "lucy.thomas@ligo.org",
"authors": "lucy.thomas@ligo.org",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41033"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41033....1L",
"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: Updated Sky localization and EM Bright Classification",
"createdOn": 1751990396739,
"submitter": "lucy.thomas@ligo.org",
"circularId": 41033,
"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 S250704ab (GCN Circular 40935). 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/S250704ab\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S250704ab is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%. The probability that the lighter compact object is below 1 solar mass (HasSSM) is <1%.\n\nThe source chirp mass falls with highest probability in the bin (5.5, 11.0) solar masses after parameter estimation [1], assuming the candidate is astrophysical in origin.\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 57 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(05h40m, +44d43m, 7.74d, 2.35d, 77.56d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 531 +/- 101 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040\n [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe",
"published": "2025-07-14T08:08:46.684435Z",
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},
{
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"topic": "gcn.circulars",
"uuid": "0d445036-f997-4afd-b4c9-df24ed967425",
"title": "LIGO/Virgo/KAGRA S250704ab: NED Galaxies in the 3-Initial Localization Volume",
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"authors": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
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"bibcode": "2025GCN.40959....1C",
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"subject": "LIGO/Virgo/KAGRA S250704ab: NED Galaxies in the 3-Initial Localization Volume",
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"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"circularId": 40959,
"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 S250704ab-3-Initial 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 1118 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/S250704ab/3 \nTop 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250704ab/3/20\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 J053258.59+491405.3| 83.24413| 49.23481| G| 523.55| null| null| null| 13.311| 0.109| 9.424| 0.006|7.71e-07| 9.97e-09|\n|WISEA J053516.57+442623.7| 83.81906| 44.43992| G| 509.25| null| null| null| 13.033| 0.125| 10.237| 0.006|1.66e-06| 9.52e-09|\n|WISEA J053539.37+465222.0| 83.91405| 46.87278| G| 461.85| null| null| null| 13.055| 0.145| 11.308| 0.009|4.66e-06| 8.19e-09|\n|WISEA J053923.04+451743.3| 84.84603| 45.29538| G| 539.56| null| null| null| 12.453| 0.119| 11.620| 0.009|3.77e-06| 6.76e-09|\n|WISEA J054250.35+455634.2| 85.70983| 45.94286| G| 483.57| null| null| null| 12.898| 0.119| 10.988| 0.007|2.12e-06| 5.57e-09|\n|WISEA J053208.93+475055.0| 83.03725| 47.84862| G| 557.44| null| null| null| 13.767| 0.225| 11.121| 0.007|1.67e-06| 5.11e-09|\n|WISEA J053723.16+460044.4| 84.34651| 46.01236| G| 407.49| null| null| null| 13.495| 0.191| 11.529| 0.007|4.32e-06| 4.87e-09|\n|WISEA J053847.35+462114.1| 84.69732| 46.35394| G| 470.87| null| null| null| 12.551| 0.100| 12.067| 0.011|4.71e-06| 4.28e-09|\n|WISEA J054001.86+462259.3| 85.00789| 46.38354| G| 428.04| null| null| null| 12.805| 0.107| 11.667| 0.008|3.64e-06| 3.93e-09|\n|WISEA J053634.97+455156.1| 84.14573| 45.86561| G| 530.56| null| null| null| 13.218| 0.133| 12.261| 0.014|4.02e-06| 3.90e-09|\n|WISEA J053325.56+455947.7| 83.35651| 45.99659| G| 419.32| null| null| null| 13.605| 0.224| 11.232| 0.006|2.42e-06| 3.76e-09|\n|WISEA J053334.13+470433.8| 83.39222| 47.07607| G| 371.60| null| 20.842| 0.261| 13.005| 0.120| 11.052| 0.009|2.57e-06| 3.71e-09|\n| 2MFGC 04519| 83.31378| 47.69047| G| 438.26| null| null| null| 11.800| 0.104| 11.609| 0.008|3.01e-06| 3.61e-09|\n|WISEA J053715.47+424503.7| 84.31447| 42.75103| G| 404.22| null| null| null| 12.767| 0.107| 9.881| 0.006|6.85e-07| 3.45e-09|\n|WISEA J053425.20+462348.5| 83.60502| 46.39682| G| 552.92| null| null| null| 13.309| 0.150| 12.061| 0.011|2.73e-06| 3.45e-09|\n|WISEA J054541.19+423211.5| 86.42163| 42.53653| G| 510.30| null| null| null| 13.697| 0.200| 10.637| 0.006|8.61e-07| 3.43e-09|\n|WISEA J053311.93+444510.8| 83.29972| 44.75302| G| 386.56| null| null| null| 12.995| 0.132| 10.209| 0.006|9.40e-07| 3.19e-09|\n|WISEA J053625.76+453611.0| 84.10735| 45.60307| G| 500.51| null| null| null| 13.030| 0.166| 12.439| 0.024|4.07e-06| 2.98e-09|\n|WISEA J054201.60+460028.5| 85.50669| 46.00793| G| 563.41| null| null| null| 12.939| 0.138| 11.887| 0.008|1.83e-06| 2.81e-09|\n|WISEA J053805.55+471905.7| 84.52316| 47.31826| G| 537.68| null| null| null| 13.255| 0.144| 12.212| 0.010|2.69e-06| 2.79e-09|\n\nTable 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250704ab 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": "2025-07-14T08:08:38.404436Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:08:38.404449Z",
"modified": "2025-07-14T08:08:38.408087Z",
"targets": []
},
{
"id": 421141,
"topic": "gcn.circulars",
"uuid": "47863c66-c7e0-4eed-8dc1-a95d8f6eb358",
"title": "LIGO/Virgo/KAGRA S250704ab: Coverage and upper limits from MAXI/GSC observations",
"submitter": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>",
"authors": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40937"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.40937....1N",
"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: Coverage and upper limits from MAXI/GSC observations",
"createdOn": 1751611761270,
"submitter": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>",
"circularId": 40937,
"submittedHow": "web"
},
"message_text": "H. Negoro, M. Nakajima, K. Takagi (Nihon U.),\nN. Kawai, T. Mihara, (RIKEN),\nS. Sugita, M. Serino, Y. Kawakubo, H. Hiramatsu, Y. Kondo (AGU)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter compact binary merger candidate S250704ab at 2025-07-04 04:30:48.040 UTC (GCN #40935).\n\nAt the trigger time of S250704ab, the high-voltage of MAXI/GSC was on,\nbut the FOV was out of the 90% credible region of the bayestar skymap.\nThe first one-orbit (92 min) scan observation with GSC after the event covered 86%\nof the 90% credible region of the bayestar skymap from 05:48:11 to 06:01:46 UTC (T0+4643 to T0+5458 sec).\n\nNo significant new source was found in the region in the one-orbit scan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\nIf you require information about X-ray flux by MAXI/GSC at specific coordinates,\nplease contact the submitter of this circular by email.",
"published": "2025-07-14T08:08:16.860614Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:08:16.860626Z",
"modified": "2025-07-14T08:08:16.864606Z",
"targets": []
},
{
"id": 421138,
"topic": "gcn.circulars",
"uuid": "13694161-517c-42e8-9aab-d331093de438",
"title": "LIGO/Virgo/KAGRA S250704ab: Identification of a GW compact binary merger candidate",
"submitter": "Pan Guo at KAGRA <panguocas@gmail.com>",
"authors": "Pan Guo at KAGRA <panguocas@gmail.com>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40935"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.40935....1L",
"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: Identification of a GW compact binary merger candidate",
"createdOn": 1751606699299,
"submitter": "Pan Guo at KAGRA <panguocas@gmail.com>",
"circularId": 40935,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250704ab during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-04 04:30:48.040 UTC (GPS time: 1435638666.040). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], and PyCBC Live [5] analysis pipelines.\n\nS250704ab is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.2e-10 Hz, or about one in 1e2 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250704ab\n\nThe initial classification of the GW signal, in order of descending probability, based on chirp-mass information only [5], is BBH (82%), NSBH (17%), Terrestrial (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that at least one of the compact objects is consistent with a neutron star mass (HasNS) is <1%. [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 14%.\n\nThe source chirp mass falls with highest probability in the bin (5.5, 11.0) solar masses, assuming the candidate is astrophysical in origin.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [7], distributed via GCN and SCiMMA notices about 27 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 77 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 536 +/- 124 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] 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\n\n",
"published": "2025-07-14T08:08:16.826326Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:08:16.826339Z",
"modified": "2025-07-14T08:08:16.830416Z",
"targets": []
},
{
"id": 421073,
"topic": "gcn.circulars",
"uuid": "3c44aa45-64a6-42fb-9a8e-abbddbae98df",
"title": "LIGO/Virgo/KAGRA S250704ab: Upper limits from Fermi-GBM Observations",
"submitter": "Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>",
"authors": "Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40955"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.40955....1D",
"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: Upper limits from Fermi-GBM Observations",
"createdOn": 1751641186593,
"submitter": "Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>",
"circularId": 40955,
"submittedHow": "web"
},
"message_text": "C. de Barra (UCD) reports on behalf of the Fermi-GBM Team:\n\nFor S250704ab (GCN 40935) and using the initial bayestar skymap, Fermi-GBM was observing 100.0% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo/KAGRA (LVK) detection of GW trigger S250704ab. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates.\n\nPart of the LVK localization region is behind the Earth for Fermi, located at an RA=355.2, Dec=-25.3 with a radius of 68.0 degrees. We therefore set upper limits on impulsive gamma-ray emission for the GW localization region visible to Fermi at merger time. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV, weighted by GW localization probability (in units of 10^-7 erg/s/cm^2):\n\nTimescale Soft Normal Hard \n------------------------------------\n0.128 s: 3.2 4.7 8.2\n1.024 s: 0.97 1.3 2.4\n8.192 s: 0.34 0.39 0.68\n\nAssuming the median luminosity distance of 536 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^50 erg/s):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128s: 0.17 0.23 0.66\n1.024s: 0.05 0.06 0.19\n8.192s: 0.02 0.02 0.05",
"published": "2025-07-14T08:07:57.123078Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:07:57.123091Z",
"modified": "2025-07-14T08:07:57.126329Z",
"targets": []
},
{
"id": 421058,
"topic": "gcn.circulars",
"uuid": "c8bc3ca9-b2f7-4d8a-bddb-1f5f79799c92",
"title": "LIGO/Virgo/KAGRA S250704ab: 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/41043"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41043....1C",
"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: NED Galaxies in the 4-Update Localization Volume",
"createdOn": 1752018175005,
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"circularId": 41043,
"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 S250704ab-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 611 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/S250704ab/4 \nTop 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250704ab/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 J053516.57+442623.7| 83.81906| 44.43992| G| 509.25| null| null| null| 13.033| 0.125| 10.237| 0.006|1.71e-06| 1.82e-08|\n|WISEA J054250.35+455634.2| 85.70983| 45.94286| G| 483.57| null| null| null| 12.898| 0.119| 10.988| 0.007|3.12e-06| 1.51e-08|\n|WISEA J053923.04+451743.3| 84.84603| 45.29538| G| 605.62| null| null| null| 12.453| 0.119| 11.620| 0.009|3.61e-06| 1.51e-08|\n|WISEA J053539.37+465222.0| 83.91405| 46.87278| G| 461.85| null| null| null| 13.055| 0.145| 11.308| 0.009|4.47e-06| 1.46e-08|\n|WISEA J054541.19+423211.5| 86.42163| 42.53653| G| 510.30| null| null| null| 13.697| 0.200| 10.637| 0.006|1.80e-06| 1.33e-08|\n|WISEA J054353.77+433318.3| 85.97407| 43.55511| G| 578.18| null| null| null| 13.998| 0.142| 11.554| 0.010|2.53e-06| 1.03e-08|\n|WISEA J053847.35+462114.1| 84.69732| 46.35394| G| 470.87| null| null| null| 12.551| 0.100| 12.067| 0.011|5.61e-06| 9.44e-09|\n|WISEA J053634.97+455156.1| 84.14573| 45.86561| G| 530.56| null| null| null| 13.218| 0.133| 12.261| 0.014|4.81e-06| 8.65e-09|\n|WISEA J053258.59+491405.3| 83.24413| 49.23481| G| 523.55| null| null| null| 13.311| 0.109| 9.424| 0.006|3.47e-07| 8.31e-09|\n|WISEA J053723.16+460044.4| 84.34651| 46.01236| G| 407.49| null| null| null| 13.495| 0.191| 11.529| 0.007|3.82e-06| 7.98e-09|\n|WISEA J054001.86+462259.3| 85.00789| 46.38354| G| 428.04| null| null| null| 12.805| 0.107| 11.667| 0.008|3.94e-06| 7.89e-09|\n|WISEA J054201.60+460028.5| 85.50669| 46.00793| G| 563.41| null| null| null| 12.939| 0.138| 11.887| 0.008|2.69e-06| 7.68e-09|\n|WISEA J053208.93+475055.0| 83.03725| 47.84862| G| 557.44| null| null| null| 13.767| 0.225| 11.121| 0.007|1.33e-06| 7.56e-09|\n|WISEA J053425.20+462348.5| 83.60502| 46.39682| G| 552.92| null| null| null| 13.309| 0.150| 12.061| 0.011|2.86e-06| 6.71e-09|\n|WISEA J054301.87+435708.0| 85.75780| 43.95222| G| 559.29| null| null| null| 13.811| 0.207| 12.385| 0.016|3.59e-06| 6.34e-09|\n|WISEA J053625.76+453611.0| 84.10735| 45.60307| G| 500.51| null| null| null| 13.030| 0.166| 12.439| 0.024|4.61e-06| 6.27e-09|\n|WISEA J054328.21+450858.0| 85.86756| 45.14945| G| 449.66| null| null| null| 13.406| 0.172| 11.996| 0.011|3.70e-06| 6.12e-09|\n|WISEA J053715.47+424503.7| 84.31447| 42.75103| G| 404.22| null| null| null| 12.767| 0.107| 9.881| 0.006|6.42e-07| 6.01e-09|\n|WISEA J053606.08+462143.1| 84.02537| 46.36199| G| 573.70| null| null| null| 13.989| 0.253| 12.477| 0.020|3.44e-06| 5.93e-09|\n|WISEA J054047.69+451204.5| 85.19873| 45.20127| G| 455.94| null| null| null| 13.402| 0.074| 12.608| 0.024|6.10e-06| 5.84e-09|\n\nTable 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250704ab 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": "2025-07-14T08:07:56.956750Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:07:56.956762Z",
"modified": "2025-07-14T08:07:56.960721Z",
"targets": []
},
{
"id": 386223,
"topic": "gcn.circulars",
"uuid": "4e43f503-5c93-47ac-a436-e765f5db41e7",
"title": "LIGO/Virgo/KAGRA S250704ab: 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/41043"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: NED Galaxies in the 4-Update Localization Volume",
"createdOn": 1752018175005,
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"circularId": 41043,
"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 S250704ab-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 611 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/S250704ab/4 \nTop 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250704ab/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 J053516.57+442623.7| 83.81906| 44.43992| G| 509.25| null| null| null| 13.033| 0.125| 10.237| 0.006|1.71e-06| 1.82e-08|\n|WISEA J054250.35+455634.2| 85.70983| 45.94286| G| 483.57| null| null| null| 12.898| 0.119| 10.988| 0.007|3.12e-06| 1.51e-08|\n|WISEA J053923.04+451743.3| 84.84603| 45.29538| G| 605.62| null| null| null| 12.453| 0.119| 11.620| 0.009|3.61e-06| 1.51e-08|\n|WISEA J053539.37+465222.0| 83.91405| 46.87278| G| 461.85| null| null| null| 13.055| 0.145| 11.308| 0.009|4.47e-06| 1.46e-08|\n|WISEA J054541.19+423211.5| 86.42163| 42.53653| G| 510.30| null| null| null| 13.697| 0.200| 10.637| 0.006|1.80e-06| 1.33e-08|\n|WISEA J054353.77+433318.3| 85.97407| 43.55511| G| 578.18| null| null| null| 13.998| 0.142| 11.554| 0.010|2.53e-06| 1.03e-08|\n|WISEA J053847.35+462114.1| 84.69732| 46.35394| G| 470.87| null| null| null| 12.551| 0.100| 12.067| 0.011|5.61e-06| 9.44e-09|\n|WISEA J053634.97+455156.1| 84.14573| 45.86561| G| 530.56| null| null| null| 13.218| 0.133| 12.261| 0.014|4.81e-06| 8.65e-09|\n|WISEA J053258.59+491405.3| 83.24413| 49.23481| G| 523.55| null| null| null| 13.311| 0.109| 9.424| 0.006|3.47e-07| 8.31e-09|\n|WISEA J053723.16+460044.4| 84.34651| 46.01236| G| 407.49| null| null| null| 13.495| 0.191| 11.529| 0.007|3.82e-06| 7.98e-09|\n|WISEA J054001.86+462259.3| 85.00789| 46.38354| G| 428.04| null| null| null| 12.805| 0.107| 11.667| 0.008|3.94e-06| 7.89e-09|\n|WISEA J054201.60+460028.5| 85.50669| 46.00793| G| 563.41| null| null| null| 12.939| 0.138| 11.887| 0.008|2.69e-06| 7.68e-09|\n|WISEA J053208.93+475055.0| 83.03725| 47.84862| G| 557.44| null| null| null| 13.767| 0.225| 11.121| 0.007|1.33e-06| 7.56e-09|\n|WISEA J053425.20+462348.5| 83.60502| 46.39682| G| 552.92| null| null| null| 13.309| 0.150| 12.061| 0.011|2.86e-06| 6.71e-09|\n|WISEA J054301.87+435708.0| 85.75780| 43.95222| G| 559.29| null| null| null| 13.811| 0.207| 12.385| 0.016|3.59e-06| 6.34e-09|\n|WISEA J053625.76+453611.0| 84.10735| 45.60307| G| 500.51| null| null| null| 13.030| 0.166| 12.439| 0.024|4.61e-06| 6.27e-09|\n|WISEA J054328.21+450858.0| 85.86756| 45.14945| G| 449.66| null| null| null| 13.406| 0.172| 11.996| 0.011|3.70e-06| 6.12e-09|\n|WISEA J053715.47+424503.7| 84.31447| 42.75103| G| 404.22| null| null| null| 12.767| 0.107| 9.881| 0.006|6.42e-07| 6.01e-09|\n|WISEA J053606.08+462143.1| 84.02537| 46.36199| G| 573.70| null| null| null| 13.989| 0.253| 12.477| 0.020|3.44e-06| 5.93e-09|\n|WISEA J054047.69+451204.5| 85.19873| 45.20127| G| 455.94| null| null| null| 13.402| 0.074| 12.608| 0.024|6.10e-06| 5.84e-09|\n\nTable 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250704ab 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": "2025-07-08T23:43:03.607570Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-08T23:43:03.607594Z",
"modified": "2025-07-08T23:43:03.614535Z",
"targets": []
},
{
"id": 384239,
"topic": "gcn.circulars",
"uuid": "e25a583f-37f1-4b8c-b006-7765c93721d9",
"title": "LIGO/Virgo/KAGRA S250704ab: Updated Sky localization and EM Bright Classification",
"submitter": "lucy.thomas@ligo.org",
"authors": "lucy.thomas@ligo.org",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41033"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: Updated Sky localization and EM Bright Classification",
"createdOn": 1751990396739,
"submitter": "lucy.thomas@ligo.org",
"circularId": 41033,
"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 S250704ab (GCN Circular 40935). 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/S250704ab\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S250704ab is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%. The probability that the lighter compact object is below 1 solar mass (HasSSM) is <1%.\n\nThe source chirp mass falls with highest probability in the bin (5.5, 11.0) solar masses after parameter estimation [1], assuming the candidate is astrophysical in origin.\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 57 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(05h40m, +44d43m, 7.74d, 2.35d, 77.56d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 531 +/- 101 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040\n [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe",
"published": "2025-07-08T16:00:03.782752Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-08T16:00:03.782772Z",
"modified": "2025-07-08T16:00:03.803572Z",
"targets": []
},
{
"id": 359737,
"topic": "gcn.circulars",
"uuid": "a4c82861-ea7d-4f3c-8d5b-aa66f131a15d",
"title": "LIGO/Virgo/KAGRA S250704ab: NED Galaxies in the 3-Initial 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/40959"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: NED Galaxies in the 3-Initial Localization Volume",
"createdOn": 1751662044005,
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"circularId": 40959,
"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 S250704ab-3-Initial 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 1118 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/S250704ab/3 \nTop 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250704ab/3/20\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 J053258.59+491405.3| 83.24413| 49.23481| G| 523.55| null| null| null| 13.311| 0.109| 9.424| 0.006|7.71e-07| 9.97e-09|\n|WISEA J053516.57+442623.7| 83.81906| 44.43992| G| 509.25| null| null| null| 13.033| 0.125| 10.237| 0.006|1.66e-06| 9.52e-09|\n|WISEA J053539.37+465222.0| 83.91405| 46.87278| G| 461.85| null| null| null| 13.055| 0.145| 11.308| 0.009|4.66e-06| 8.19e-09|\n|WISEA J053923.04+451743.3| 84.84603| 45.29538| G| 539.56| null| null| null| 12.453| 0.119| 11.620| 0.009|3.77e-06| 6.76e-09|\n|WISEA J054250.35+455634.2| 85.70983| 45.94286| G| 483.57| null| null| null| 12.898| 0.119| 10.988| 0.007|2.12e-06| 5.57e-09|\n|WISEA J053208.93+475055.0| 83.03725| 47.84862| G| 557.44| null| null| null| 13.767| 0.225| 11.121| 0.007|1.67e-06| 5.11e-09|\n|WISEA J053723.16+460044.4| 84.34651| 46.01236| G| 407.49| null| null| null| 13.495| 0.191| 11.529| 0.007|4.32e-06| 4.87e-09|\n|WISEA J053847.35+462114.1| 84.69732| 46.35394| G| 470.87| null| null| null| 12.551| 0.100| 12.067| 0.011|4.71e-06| 4.28e-09|\n|WISEA J054001.86+462259.3| 85.00789| 46.38354| G| 428.04| null| null| null| 12.805| 0.107| 11.667| 0.008|3.64e-06| 3.93e-09|\n|WISEA J053634.97+455156.1| 84.14573| 45.86561| G| 530.56| null| null| null| 13.218| 0.133| 12.261| 0.014|4.02e-06| 3.90e-09|\n|WISEA J053325.56+455947.7| 83.35651| 45.99659| G| 419.32| null| null| null| 13.605| 0.224| 11.232| 0.006|2.42e-06| 3.76e-09|\n|WISEA J053334.13+470433.8| 83.39222| 47.07607| G| 371.60| null| 20.842| 0.261| 13.005| 0.120| 11.052| 0.009|2.57e-06| 3.71e-09|\n| 2MFGC 04519| 83.31378| 47.69047| G| 438.26| null| null| null| 11.800| 0.104| 11.609| 0.008|3.01e-06| 3.61e-09|\n|WISEA J053715.47+424503.7| 84.31447| 42.75103| G| 404.22| null| null| null| 12.767| 0.107| 9.881| 0.006|6.85e-07| 3.45e-09|\n|WISEA J053425.20+462348.5| 83.60502| 46.39682| G| 552.92| null| null| null| 13.309| 0.150| 12.061| 0.011|2.73e-06| 3.45e-09|\n|WISEA J054541.19+423211.5| 86.42163| 42.53653| G| 510.30| null| null| null| 13.697| 0.200| 10.637| 0.006|8.61e-07| 3.43e-09|\n|WISEA J053311.93+444510.8| 83.29972| 44.75302| G| 386.56| null| null| null| 12.995| 0.132| 10.209| 0.006|9.40e-07| 3.19e-09|\n|WISEA J053625.76+453611.0| 84.10735| 45.60307| G| 500.51| null| null| null| 13.030| 0.166| 12.439| 0.024|4.07e-06| 2.98e-09|\n|WISEA J054201.60+460028.5| 85.50669| 46.00793| G| 563.41| null| null| null| 12.939| 0.138| 11.887| 0.008|1.83e-06| 2.81e-09|\n|WISEA J053805.55+471905.7| 84.52316| 47.31826| G| 537.68| null| null| null| 13.255| 0.144| 12.212| 0.010|2.69e-06| 2.79e-09|\n\nTable 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250704ab 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": "2025-07-04T20:47:34.548809Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-04T20:47:34.548834Z",
"modified": "2025-07-04T20:47:34.561937Z",
"targets": []
},
{
"id": 358185,
"topic": "gcn.circulars",
"uuid": "1e794b1f-a165-4a49-8d57-814c0e50a62a",
"title": "LIGO/Virgo/KAGRA S250704ab: Upper limits from Fermi-GBM Observations",
"submitter": "Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>",
"authors": "Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40955"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: Upper limits from Fermi-GBM Observations",
"createdOn": 1751641186593,
"submitter": "Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>",
"circularId": 40955,
"submittedHow": "web"
},
"message_text": "C. de Barra (UCD) reports on behalf of the Fermi-GBM Team:\n\nFor S250704ab (GCN 40935) and using the initial bayestar skymap, Fermi-GBM was observing 100.0% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo/KAGRA (LVK) detection of GW trigger S250704ab. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates.\n\nPart of the LVK localization region is behind the Earth for Fermi, located at an RA=355.2, Dec=-25.3 with a radius of 68.0 degrees. We therefore set upper limits on impulsive gamma-ray emission for the GW localization region visible to Fermi at merger time. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV, weighted by GW localization probability (in units of 10^-7 erg/s/cm^2):\n\nTimescale Soft Normal Hard \n------------------------------------\n0.128 s: 3.2 4.7 8.2\n1.024 s: 0.97 1.3 2.4\n8.192 s: 0.34 0.39 0.68\n\nAssuming the median luminosity distance of 536 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^50 erg/s):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128s: 0.17 0.23 0.66\n1.024s: 0.05 0.06 0.19\n8.192s: 0.02 0.02 0.05",
"published": "2025-07-04T14:59:49.269281Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-04T14:59:49.269311Z",
"modified": "2025-07-04T14:59:49.288163Z",
"targets": []
},
{
"id": 355964,
"topic": "gcn.circulars",
"uuid": "8d7f1683-d071-465b-816c-27ebc46cbd21",
"title": "LIGO/Virgo/KAGRA S250704ab: Coverage and upper limits from MAXI/GSC observations",
"submitter": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>",
"authors": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40937"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: Coverage and upper limits from MAXI/GSC observations",
"createdOn": 1751611761270,
"submitter": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>",
"circularId": 40937,
"submittedHow": "web"
},
"message_text": "H. Negoro, M. Nakajima, K. Takagi (Nihon U.),\nN. Kawai, T. Mihara, (RIKEN),\nS. Sugita, M. Serino, Y. Kawakubo, H. Hiramatsu, Y. Kondo (AGU)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter compact binary merger candidate S250704ab at 2025-07-04 04:30:48.040 UTC (GCN #40935).\n\nAt the trigger time of S250704ab, the high-voltage of MAXI/GSC was on,\nbut the FOV was out of the 90% credible region of the bayestar skymap.\nThe first one-orbit (92 min) scan observation with GSC after the event covered 86%\nof the 90% credible region of the bayestar skymap from 05:48:11 to 06:01:46 UTC (T0+4643 to T0+5458 sec).\n\nNo significant new source was found in the region in the one-orbit scan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\nIf you require information about X-ray flux by MAXI/GSC at specific coordinates,\nplease contact the submitter of this circular by email.",
"published": "2025-07-04T06:49:29.464723Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-04T06:49:29.464748Z",
"modified": "2025-07-04T06:49:29.468002Z",
"targets": []
},
{
"id": 355586,
"topic": "gcn.circulars",
"uuid": "5b16c920-1455-4de3-9272-caf4ebbc260a",
"title": "LIGO/Virgo/KAGRA S250704ab: Identification of a GW compact binary merger candidate",
"submitter": "Pan Guo at KAGRA <panguocas@gmail.com>",
"authors": "Pan Guo at KAGRA <panguocas@gmail.com>",
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"eventId": "LIGO/Virgo/KAGRA S250704ab",
"subject": "LIGO/Virgo/KAGRA S250704ab: Identification of a GW compact binary merger candidate",
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"submitter": "Pan Guo at KAGRA <panguocas@gmail.com>",
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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 S250704ab during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-04 04:30:48.040 UTC (GPS time: 1435638666.040). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], and PyCBC Live [5] analysis pipelines.\n\nS250704ab is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.2e-10 Hz, or about one in 1e2 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250704ab\n\nThe initial classification of the GW signal, in order of descending probability, based on chirp-mass information only [5], is BBH (82%), NSBH (17%), Terrestrial (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that at least one of the compact objects is consistent with a neutron star mass (HasNS) is <1%. [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 14%.\n\nThe source chirp mass falls with highest probability in the bin (5.5, 11.0) solar masses, assuming the candidate is astrophysical in origin.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [7], distributed via GCN and SCiMMA notices about 27 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 77 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 536 +/- 124 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] 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\n\n",
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},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sun 06 Jul 25 20:54:05 UT\nNOTICE_TYPE: ICECUBE Astrotrack Gold \nSTREAM: 24\nRUN_NUM: 141104\nEVENT_NUM: 37015490\nSRC_RA: 266.0000d {+17h 44m 00s} (J2000),\n 266.2123d {+17h 44m 51s} (current),\n 265.5842d {+17h 42m 20s} (1950)\nSRC_DEC: +38.9699d {+38d 58' 12\"} (J2000),\n +38.9603d {+38d 57' 37\"} (current),\n +38.9903d {+38d 59' 25\"} (1950)\nSRC_ERROR: 31.80 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 17.39 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20862 TJD; 187 DOY; 25/07/06 (yy/mm/dd)\nDISCOVERY_TIME: 47680 SOD {13:14:40.04} UT\nREVISION: 1\nENERGY: 2.1208e+02 [TeV]\nSIGNALNESS: 6.5223e-01 [dn]\nFAR: 0.2382 [yr^-1]\nSUN_POSTN: 106.31d {+07h 05m 15s} +22.59d {+22d 35' 17\"}\nSUN_DIST: 115.64 [deg] Sun_angle= -10.7 [hr] (East of Sun)\nMOON_POSTN: 236.09d {+15h 44m 22s} -24.58d {-24d 34' 42\"}\nMOON_DIST: 69.51 [deg]\nGAL_COORDS: 64.48, 29.17 [deg] galactic lon,lat of the event\nECL_COORDS: 263.30, 62.32 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Gold event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-07-06T20:54:05Z",
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{
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"title": "GCN/AMON NOTICE",
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"discovery_date": "20862 TJD; 187 DOY; 25/07/06 (yy/mm/dd)",
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},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sun 06 Jul 25 20:54:05 UT\nNOTICE_TYPE: ICECUBE Astrotrack Gold \nSTREAM: 24\nRUN_NUM: 141104\nEVENT_NUM: 37015490\nSRC_RA: 266.0000d {+17h 44m 00s} (J2000),\n 266.2123d {+17h 44m 51s} (current),\n 265.5842d {+17h 42m 20s} (1950)\nSRC_DEC: +38.9699d {+38d 58' 12\"} (J2000),\n +38.9603d {+38d 57' 37\"} (current),\n +38.9903d {+38d 59' 25\"} (1950)\nSRC_ERROR: 31.80 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 17.39 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20862 TJD; 187 DOY; 25/07/06 (yy/mm/dd)\nDISCOVERY_TIME: 47680 SOD {13:14:40.04} UT\nREVISION: 1\nENERGY: 2.1208e+02 [TeV]\nSIGNALNESS: 6.5223e-01 [dn]\nFAR: 0.2382 [yr^-1]\nSUN_POSTN: 106.31d {+07h 05m 15s} +22.59d {+22d 35' 17\"}\nSUN_DIST: 115.64 [deg] Sun_angle= -10.7 [hr] (East of Sun)\nMOON_POSTN: 236.09d {+15h 44m 22s} -24.58d {-24d 34' 42\"}\nMOON_DIST: 69.51 [deg]\nGAL_COORDS: 64.48, 29.17 [deg] galactic lon,lat of the event\nECL_COORDS: 263.30, 62.32 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Gold event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-07-06T20:54:05Z",
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},
{
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"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sun 06 Jul 25 13:15:14 UT\nNOTICE_TYPE: ICECUBE Astrotrack Gold \nSTREAM: 24\nRUN_NUM: 141104\nEVENT_NUM: 37015490\nSRC_RA: 265.9770d {+17h 43m 54s} (J2000),\n 266.1892d {+17h 44m 45s} (current),\n 265.5613d {+17h 42m 15s} (1950)\nSRC_DEC: +38.9943d {+38d 59' 39\"} (J2000),\n +38.9846d {+38d 59' 05\"} (current),\n +39.0148d {+39d 00' 53\"} (1950)\nSRC_ERROR: 36.26 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 14.12 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20862 TJD; 187 DOY; 25/07/06 (yy/mm/dd)\nDISCOVERY_TIME: 47680 SOD {13:14:40.04} UT\nREVISION: 0\nENERGY: 2.1208e+02 [TeV]\nSIGNALNESS: 6.5223e-01 [dn]\nFAR: 0.2382 [yr^-1]\nSUN_POSTN: 105.99d {+07h 03m 56s} +22.62d {+22d 37' 18\"}\nSUN_DIST: 115.67 [deg] Sun_angle= -10.7 [hr] (East of Sun)\nMOON_POSTN: 232.07d {+15h 28m 16s} -23.56d {-23d 33' 26\"}\nMOON_DIST: 70.22 [deg]\nGAL_COORDS: 64.51, 29.20 [deg] galactic lon,lat of the event\nECL_COORDS: 263.25, 62.34 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Gold event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
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"references": [
{
"id": 1127301,
"topic": "gcn.circulars",
"uuid": "4a3cf749-14e7-4027-8393-7e4886156ca6",
"title": "LIGO/Virgo/KAGRA S250712cd: Updated Sky localization",
"submitter": "Sylvia Biscoveanu at Northwestern CIERA <sylvia.biscoveanu@ligo.org>",
"authors": "Sylvia Biscoveanu at Northwestern CIERA <sylvia.biscoveanu@ligo.org>",
"data": {
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},
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"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41080....1L",
"eventId": "LIGO/Virgo/KAGRA S250712cd",
"subject": "LIGO/Virgo/KAGRA S250712cd: Updated Sky localization",
"createdOn": 1752435582075,
"submitter": "Sylvia Biscoveanu at Northwestern CIERA <sylvia.biscoveanu@ligo.org>",
"circularId": 41080,
"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 S250712cd (GCN Circular 41075). 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/S250712cd\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 180 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(19h24m, +55d04m, 10.93d, 5.26d, 101.96d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 2439 +/- 870 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": "2025-07-21T09:51:08.941248Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-21T09:51:08.941270Z",
"modified": "2025-07-21T09:51:08.946534Z",
"targets": []
},
{
"id": 1127299,
"topic": "gcn.circulars",
"uuid": "53bfc363-b6e0-4619-8f35-a7592d045183",
"title": "LIGO/Virgo/KAGRA S250712cd: 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": {
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},
"format": "text/plain",
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"bibcode": "2025GCN.41075....1L",
"eventId": "LIGO/Virgo/KAGRA S250712cd",
"subject": "LIGO/Virgo/KAGRA S250712cd: Identification of a GW compact binary merger candidate",
"createdOn": 1752332695174,
"submitter": "Cassius Melo at Universidade Federal de Alfenas - UNIFAL-MG <cassiusanderson.melo@ligo.org>",
"circularId": 41075,
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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 S250712cd during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-12 14:25:32.329 UTC (GPS time: 1436365550.329). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], and MBTA [4] analysis pipelines.\n\nS250712cd is an event of interest because its false alarm rate, as estimated by the online analysis, is 2.7e-11 Hz, or about one in 1e3 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250712cd\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%. [5] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [5] 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 [6], 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 [6], 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 well fit by an ellipse with an area of 395 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(19h30m, +55d32m, 15.21d, 8.35d, 104.26d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 2177 +/- 664 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] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [6] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
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"title": "LIGO/Virgo/KAGRA S250712cd: Updated Sky localization",
"submitter": "Sylvia Biscoveanu at Northwestern CIERA <sylvia.biscoveanu@ligo.org>",
"authors": "Sylvia Biscoveanu at Northwestern CIERA <sylvia.biscoveanu@ligo.org>",
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"circularId": 41080,
"submittedHow": "web"
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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 S250712cd (GCN Circular 41075). 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/S250712cd\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 180 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(19h24m, +55d04m, 10.93d, 5.26d, 101.96d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 2439 +/- 870 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": "2025-07-13T19:39:50.871811Z",
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{
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"topic": "gcn.circulars",
"uuid": "445372a0-8b1c-42c4-8fe7-a3969c6bad02",
"title": "LIGO/Virgo/KAGRA S250712cd: 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>",
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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 S250712cd during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-12 14:25:32.329 UTC (GPS time: 1436365550.329). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], and MBTA [4] analysis pipelines.\n\nS250712cd is an event of interest because its false alarm rate, as estimated by the online analysis, is 2.7e-11 Hz, or about one in 1e3 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250712cd\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%. [5] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [5] 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 [6], 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 [6], 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 well fit by an ellipse with an area of 395 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(19h30m, +55d32m, 15.21d, 8.35d, 104.26d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 2177 +/- 664 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] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [6] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
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},
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"published": "2025-07-11T04:21:36.409609Z",
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}
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"submitter": "cody.messick-30d512c8",
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},
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],
"references": [
{
"id": 1230410,
"topic": "gcn.circulars",
"uuid": "87233f76-48e7-434a-906c-7854c19a616f",
"title": "LIGO/Virgo/KAGRA S250711q: Updated Sky localization",
"submitter": "rudall@caltech.edu",
"authors": "rudall@caltech.edu",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41132"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250711q",
"subject": "LIGO/Virgo/KAGRA S250711q: Updated Sky localization",
"createdOn": 1753135168615,
"submitter": "rudall@caltech.edu",
"circularId": 41132,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further offline 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 S250711q (GCN Circular 41062). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline1.multiorder.fits,0, distributed via GCN and SCiMMA notices, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S250711q\n\nFor the Bilby.offline1.multiorder.fits,0 sky map, the 90% credible region is 2016 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4756 +/- 2023 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": "2025-07-21T21:59:35.719042Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-21T21:59:35.719056Z",
"modified": "2025-07-21T21:59:35.726351Z",
"targets": []
},
{
"id": 498830,
"topic": "gcn.circulars",
"uuid": "ef4ff008-8d57-435a-8921-c9bf0a7e2823",
"title": "LIGO/Virgo/KAGRA S250711q: 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/41120"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250711q",
"subject": "LIGO/Virgo/KAGRA S250711q: Upper limits from Swift/BAT-GUANO",
"createdOn": 1752865581335,
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"circularId": 41120,
"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 73.58% of the GW localization probability ([bayestar.multiorder.fits](https://gracedb.ligo.org/api/superevents/S250711q/files/bayestar.multiorder.fits)) at merger time. A fraction 58.56% 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 |3.27 |2.72 |2.52 |2.89 \n|1.024 |1.67 |1.39 |1.29 |1.48 \n|4.096 |0.90 |0.75 |0.70 |0.80 \n|16.384 |0.57 |0.47 |0.44 |0.50 \n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://zenodo.org/records/16106142\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": "2025-07-18T19:06:30.852478Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-18T19:06:30.852493Z",
"modified": "2025-07-18T19:06:30.862091Z",
"targets": []
},
{
"id": 421226,
"topic": "gcn.circulars",
"uuid": "2420b2ef-f738-4ac3-8270-e4efbcbd2ce5",
"title": "LIGO/Virgo/KAGRA S250711q: Identification of a GW compact binary merger candidate",
"submitter": "Jyotirmaya Mohanta at University of Tsukuba <s2430161@u.tsukuba.ac.jp>",
"authors": "Jyotirmaya Mohanta at University of Tsukuba <s2430161@u.tsukuba.ac.jp>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41062"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41062....1L",
"eventId": "LIGO/Virgo/KAGRA S250711q",
"subject": "LIGO/Virgo/KAGRA S250711q: Identification of a GW compact binary merger candidate",
"createdOn": 1752208584424,
"submitter": "Jyotirmaya Mohanta at University of Tsukuba <s2430161@u.tsukuba.ac.jp>",
"circularId": 41062,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250711q during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-11 03:27:25.108 UTC (GPS time: 1436239663.108). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], and MBTA [4] analysis pipelines.\n\nS250711q is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.6e-09 Hz, or about one in 20 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250711q\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), 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%. [5] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [5] 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 [6], 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 [6], 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 2964 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 9738 +/- 2925 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] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [6] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
"published": "2025-07-14T08:08:40.944628Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:08:40.944641Z",
"modified": "2025-07-14T08:08:40.947931Z",
"targets": []
},
{
"id": 400504,
"topic": "gcn.circulars",
"uuid": "f9111e9b-83d5-48a8-a3cf-ed9b2a4a8306",
"title": "LIGO/Virgo/KAGRA S250711q: Identification of a GW compact binary merger candidate",
"submitter": "Jyotirmaya Mohanta at University of Tsukuba <s2430161@u.tsukuba.ac.jp>",
"authors": "Jyotirmaya Mohanta at University of Tsukuba <s2430161@u.tsukuba.ac.jp>",
"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 S250711q",
"subject": "LIGO/Virgo/KAGRA S250711q: Identification of a GW compact binary merger candidate",
"createdOn": 1752208584424,
"submitter": "Jyotirmaya Mohanta at University of Tsukuba <s2430161@u.tsukuba.ac.jp>",
"circularId": 41062,
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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 S250711q during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-11 03:27:25.108 UTC (GPS time: 1436239663.108). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], and MBTA [4] analysis pipelines.\n\nS250711q is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.6e-09 Hz, or about one in 20 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250711q\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), 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%. [5] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [5] 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 [6], 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 [6], 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 2964 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 9738 +/- 2925 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] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [6] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
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{
"id": 5781014,
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"uuid": "eb34ccff-c88f-41d7-a988-5f43425cc36a",
"title": "LIGO/Virgo/KAGRA S250725j: Observations with the NSF-DOE Vera C. Rubin Observatory",
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"subject": "LIGO/Virgo/KAGRA S250725j: Observations with the NSF-DOE Vera C. Rubin Observatory",
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"message_text": "Sean MacBride (University of Zurich), Shreya Anand (Stanford University), Erin Howard, Ian Sullivan, David Wang, Lynne Jones, Peter Yoachim, Eric Bellm (University of Washington), Bob Armstrong (Lawrence Livermore National Laboratory), Michael Wood-Vasey (University of Pittsburgh), Alex Drlica-Wagner, Ken Herner (Fermi National Accelerator Laboratory), Gautham Narayan (University of Illinois), Tatiana Acero Cuellar, Federica Bianco (University of Delaware), Bruno Sánchez (Aix Marseille Université), John Banovetz (Lawrence Berkeley National Laboratory), Kris Mortensen, Paulina Venegas, Yijung Kang, Yousuke Utsumi, and Tiago Ribeiro (NSF-DOE Vera C Rubin Observatory), reporting on behalf of NSF-DOE Vera C Rubin Observatory:\n\nWe observed the localization region of the binary black hole merger S250725j, reported by LIGO/Virgo/KAGRA (GCN 41154, GCN 41168) with the 9.6 square degree field of view LSST Camera mounted on the 8.4-m Simonyi Survey Telescope at the Vera C. Rubin Observatory. This is the first Target-of-Opportunity observation by Rubin Observatory.\n\nRubin Observatory is conducting a Science Validation (SV) survey as part of its commissioning activities [1]. During this period, data quality and acquisition rate are variable. Not all data products that will be available during the Legacy Survey of Space and Time (LSST) operations are currently available [2]. \n\nObservations were conducted as a part of commissioning the Rubin Target-of-Opportunity (ToO) system. We used the SCiMMA Hopskotch infrastructure to send the alert data from LVK to Rubin Observatory infrastructure [3]. The observing strategy for this gravitational wave event follows the community recommendation for a binary black-hole merger candidate of this distance and sky condition [4]. The observing strategy calls for multiple epochs of observation, but weather conditions have prevented further observations.\n\nThe localization region of S250725j is not inside the SV survey footprint, so no prior Rubin images of this region were available. We obtained two visits in each of the u, r, and i bands with 30s exposures. Observations were taken on the night of July 29, 2025, beginning at 02:28:07.875 UTC and concluding at 03:20:18.800 UTC. We observed with nine 9.6 square degree pointings centered on the following ICRS coordinates:\n\n| RA | DEC |\n|---------|---------|\n| 230.604 | -38.402 |\n| 232.198 | -35.510 |\n| 232.568 | -41.024 |\n| 233.614 | -32.596 |\n| 234.198 | -38.132 |\n| 235.633 | -35.209 |\n| 236.925 | -32.268 |\n| 237.769 | -37.776 |\n\nWe covered 94% of the total localization area in all three bands, reaching a median depth of 24.1 mag in r band, 23.8 mag in the i band, and 23.6 in u band. \n\nDue to the lack of prior Rubin observations of the region, we performed image differencing against DECam templates from DES DR2 [5]. To support the usage of DECam templates, we devised a custom image processing task to create DECam templates from DES templates for use with LSSTCam observations. Apart from the DECam template task, we utilize the standard LSST data release production pipeline to obtain difference images and photometry on difference image sources [6]. \n\nWith only a single epoch of observations at Rubin observatory, we are unable to characterize viable candidates from Rubin observations alone. Here, we report on candidates reported in GCN 41206 and GCN 41177.\n\nWe detect four candidates reported by the DESGW collaboration (GCN 41206), and two candidates reported by the GW-MMADS collaboration (GCN 41177, two candidates recovered by both collaborations). AT2025sib, AT2025srk, and AT2025srm are detected in both r and i band difference images. At the position of AT2025srm and AT2025sib there is a galaxy in the DES template images, and a point source present in the difference images. AT2025srk shows a point source present in the LSSTCam images, but not the DES templates. We caution that AT2025shz may be a variable star, as there is a point source at the location in the DES templates.\n\n| AT name | Observation Date | RA | Dec | r | unc_r | i | unc_i |\n|-----------|------------------|-----------|------------|-------|-------|-------|-------|\n| AT2025sib | 2025-07-29 | 235.548892 | -35.002876 | 20.95 | 0.03 | 20.76 | 0.03 |\n| AT2025srk | 2025-07-29 | 234.755524 | -36.425993 | 21.17 | 0.04 | 21.31 | 0.06 |\n| AT2025srm | 2025-07-29 | 232.987656 | -36.816564 | 21.90 | 0.05 | 22.99 | 0.21 |\n| AT2025shz | 2025-07-29 | 231.072434 | -37.622634 | 22.25 | 0.07 | 21.97 | 0.11 |\n\nAnalysis of these candidates is ongoing.\n\nThis material is based upon work supported in part by the National Science Foundation through Cooperative Agreements AST-1258333 and AST-2241526 and Cooperative Support Agreements AST-1202910 and 2211468 managed by the Association of Universities for Research in Astronomy (AURA), and the Department of Energy under Contract No. DE-AC02-76SF00515 with the SLAC National Accelerator Laboratory managed by Stanford University. Additional Rubin Observatory funding comes from private donations, grants to universities, and in-kind support from LSST-DA Institutional Members.\n\n[1] https://sitcomtn-005.lsst.io, §6\n\n[2] https://lse-163.lsst.io \n\n[3] www.scimma.org\n\n[4] www.inspirehep.net/literature/2846480 \n\n[5] www.inspirehep.net/literature/1841103\n\n[6] https://pstn-019.lsst.io",
"published": "2025-09-22T08:08:50.157372Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-22T08:08:50.157380Z",
"modified": "2025-09-22T08:08:50.161742Z",
"targets": []
},
{
"id": 5774536,
"topic": "gcn.circulars",
"uuid": "e1c53aef-347c-4ed1-8ce1-14306ce88463",
"title": "LIGO/Virgo/KAGRA S250725j: Observations with the NSF-DOE Vera C. Rubin Observatory",
"submitter": "Sean MacBride at University of Zurich <sean.p.macbride@gmail.com>",
"authors": "Sean MacBride at University of Zurich <sean.p.macbride@gmail.com>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41595"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: Observations with the NSF-DOE Vera C. Rubin Observatory",
"version": 2,
"editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Sean MacBride at University of Zurich <sean.p.macbride@gmail.com>",
"editedOn": 1756754041854,
"createdOn": 1756494134562,
"submitter": "Sean MacBride at University of Zurich <sean.p.macbride@gmail.com>",
"circularId": 41595,
"submittedHow": "web"
},
"message_text": "Sean MacBride (University of Zurich), Shreya Anand (Stanford University), Erin Howard, Ian Sullivan, David Wang, Lynne Jones, Peter Yoachim, Eric Bellm (University of Washington), Bob Armstrong (Lawrence Livermore National Laboratory), Michael Wood-Vasey (University of Pittsburgh), Alex Drlica-Wagner, Ken Herner (Fermi National Accelerator Laboratory), Gautham Narayan (University of Illinois), Tatiana Acero Cuellar, Federica Bianco (University of Delaware), Bruno Sánchez (Aix Marseille Université), John Banovetz (Lawrence Berkeley National Laboratory), Kris Mortensen, Paulina Venegas, Yijung Kang, Yousuke Utsumi, and Tiago Ribeiro (NSF-DOE Vera C Rubin Observatory), reporting on behalf of NSF-DOE Vera C Rubin Observatory:\n\nWe observed the localization region of the binary black hole merger S250725j, reported by LIGO/Virgo/KAGRA (GCN 41154, GCN 41168) with the 9.6 square degree field of view LSST Camera mounted on the 8.4-m Simonyi Survey Telescope at the Vera C. Rubin Observatory. This is the first Target-of-Opportunity observation by Rubin Observatory.\n\nRubin Observatory is conducting a Science Validation (SV) survey as part of its commissioning activities [1]. During this period, data quality and acquisition rate are variable. Not all data products that will be available during the Legacy Survey of Space and Time (LSST) operations are currently available [2]. \n\nObservations were conducted as a part of commissioning the Rubin Target-of-Opportunity (ToO) system. We used the SCiMMA Hopskotch infrastructure to send the alert data from LVK to Rubin Observatory infrastructure [3]. The observing strategy for this gravitational wave event follows the community recommendation for a binary black-hole merger candidate of this distance and sky condition [4]. The observing strategy calls for multiple epochs of observation, but weather conditions have prevented further observations.\n\nThe localization region of S250725j is not inside the SV survey footprint, so no prior Rubin images of this region were available. We obtained two visits in each of the u, r, and i bands with 30s exposures. Observations were taken on the night of July 29, 2025, beginning at 02:28:07.875 UTC and concluding at 03:20:18.800 UTC. We observed with nine 9.6 square degree pointings centered on the following ICRS coordinates:\n\n| RA | DEC |\n|---------|---------|\n| 230.604 | -38.402 |\n| 232.198 | -35.510 |\n| 232.568 | -41.024 |\n| 233.614 | -32.596 |\n| 234.198 | -38.132 |\n| 235.633 | -35.209 |\n| 236.925 | -32.268 |\n| 237.769 | -37.776 |\n\nWe covered 94% of the total localization area in all three bands, reaching a median depth of 24.1 mag in r band, 23.8 mag in the i band, and 23.6 in u band. \n\nDue to the lack of prior Rubin observations of the region, we performed image differencing against DECam templates from DES DR2 [5]. To support the usage of DECam templates, we devised a custom image processing task to create DECam templates from DES templates for use with LSSTCam observations. Apart from the DECam template task, we utilize the standard LSST data release production pipeline to obtain difference images and photometry on difference image sources [6]. \n\nWith only a single epoch of observations at Rubin observatory, we are unable to characterize viable candidates from Rubin observations alone. Here, we report on candidates reported in GCN 41206 and GCN 41177.\n\nWe detect four candidates reported by the DESGW collaboration (GCN 41206), and two candidates reported by the GW-MMADS collaboration (GCN 41177, two candidates recovered by both collaborations). AT2025sib, AT2025srk, and AT2025srm are detected in both r and i band difference images. At the position of AT2025srm and AT2025sib there is a galaxy in the DES template images, and a point source present in the difference images. AT2025srk shows a point source present in the LSSTCam images, but not the DES templates. We caution that AT2025shz may be a variable star, as there is a point source at the location in the DES templates.\n\n| AT name | Observation Date | RA | Dec | r | unc_r | i | unc_i |\n|-----------|------------------|-----------|------------|-------|-------|-------|-------|\n| AT2025sib | 2025-07-29 | 235.548892 | -35.002876 | 20.95 | 0.03 | 20.76 | 0.03 |\n| AT2025srk | 2025-07-29 | 234.755524 | -36.425993 | 21.17 | 0.04 | 21.31 | 0.06 |\n| AT2025srm | 2025-07-29 | 232.987656 | -36.816564 | 21.90 | 0.05 | 22.99 | 0.21 |\n| AT2025shz | 2025-07-29 | 231.072434 | -37.622634 | 22.25 | 0.07 | 21.97 | 0.11 |\n\nAnalysis of these candidates is ongoing.\n\nThis material is based upon work supported in part by the National Science Foundation through Cooperative Agreements AST-1258333 and AST-2241526 and Cooperative Support Agreements AST-1202910 and 2211468 managed by the Association of Universities for Research in Astronomy (AURA), and the Department of Energy under Contract No. DE-AC02-76SF00515 with the SLAC National Accelerator Laboratory managed by Stanford University. Additional Rubin Observatory funding comes from private donations, grants to universities, and in-kind support from LSST-DA Institutional Members.\n\n[1] https://sitcomtn-005.lsst.io, §6\n\n[2] https://lse-163.lsst.io \n\n[3] www.scimma.org\n\n[4] www.inspirehep.net/literature/2846480 \n\n[5] www.inspirehep.net/literature/1841103\n\n[6] https://pstn-019.lsst.io",
"published": "2025-09-01T19:14:05.093671Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-09-01T19:14:05.093690Z",
"modified": "2025-09-01T19:14:05.108151Z",
"targets": []
},
{
"id": 5773725,
"topic": "gcn.circulars",
"uuid": "167027e0-a3a8-4d94-963f-5f8157d69c90",
"title": "LIGO/Virgo/KAGRA S250725j: Observations with the NSF-DOE Vera C. Rubin Observatory",
"submitter": "Sean MacBride at University of Zurich <sean.p.macbride@gmail.com>",
"authors": "Sean MacBride at University of Zurich <sean.p.macbride@gmail.com>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41595"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.5.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: Observations with the NSF-DOE Vera C. Rubin Observatory",
"createdOn": 1756494134562,
"submitter": "Sean MacBride at University of Zurich <sean.p.macbride@gmail.com>",
"circularId": 41595,
"submittedHow": "web"
},
"message_text": "Sean MacBride (University of Zurich), Shreya Anand (Stanford University), Erin Howard, Ian Sullivan, David Wang, Lynne Jones, Peter Yoachim, Eric Bellm (University of Washington), Bob Armstrong (Lawrence Livermore National Laboratory), Michael Wood-Vasey (University of Pittsburgh), Alex Drlica-Wagner, Ken Herner (Fermi National Accelerator Laboratory), Gautham Narayan (University of Illinois), Tatiana Acero Cuellar, Federica Bianco (University of Delaware), Bruno Sánchez (Aix Marseille Université), John Banovetz (Lawrence Berkeley National Laboratory), Kris Mortensen, Paulina Venegas, Yijung Kang, Yousuke Utsumi, and Tiago Ribeiro (NSF-DOE Vera C Rubin Observatory), reporting on behalf of NSF-DOE Vera C Rubin Observatory:\n\nWe observed the localization region of the binary black hole merger S250725j, reported by LIGO/Virgo/KAGRA (GCN 41154, GCN 41168) with the 9.6 square degree field of view LSST Camera mounted on the 8.4-m Simonyi Survey Telescope at the Vera C. Rubin Observatory. This is the first Target-of-Opportunity observation by Rubin Observatory.\n\nRubin Observatory is conducting a Science Validation (SV) survey as part of its commissioning activities [1]. During this period, data quality and acquisition rate are variable. Not all data products that will be available during the Legacy Survey of Space and Time (LSST) operations are currently available [2]. \n\nObservations were conducted as a part of commissioning the Rubin Target-of-Opportunity (ToO) system. The observing strategy for this gravitational wave event follows the community recommendation for a binary black-hole merger candidate of this distance and sky condition [3]. The observing strategy calls for multiple epochs of observation, but weather conditions have prevented further observations.\n\nThe localization region of S250725j is not inside the SV survey footprint, so no prior Rubin images of this region were available. We obtained two visits in each of the u, r, and i bands with 30s exposures. Observations were taken on the night of July 29, 2025, beginning at 02:28:07.875 UTC and concluding at 03:20:18.800 UTC. We observed with nine 9.6 square degree pointings centered on the following ICRS coordinates:\n\n| RA | DEC |\n|---------|---------|\n| 230.604 | -38.402 |\n| 232.198 | -35.510 |\n| 232.568 | -41.024 |\n| 233.614 | -32.596 |\n| 234.198 | -38.132 |\n| 235.633 | -35.209 |\n| 236.925 | -32.268 |\n| 237.769 | -37.776 |\n\nWe covered 94% of the total localization area in all three bands, reaching a median depth of 24.1 mag in r band, 23.8 mag in the i band, and 23.6 in u band. \n\nDue to the lack of prior Rubin observations of the region, we performed image differencing against DECam templates from DES DR2 [4]. To support the usage of DECam templates, we devised a custom image processing task to create DECam templates from DES templates for use with LSSTCam observations. Apart from the DECam template task, we utilize the standard LSST data release production pipeline to obtain difference images and photometry on difference image sources [5]. \n\nWith only a single epoch of observations at Rubin observatory, we are unable to characterize viable candidates from Rubin observations alone. Here, we report on candidates reported in GCN 41206 and GCN 41177.\n\nWe detect four candidates reported by the DESGW collaboration (GCN 41206), and two candidates reported by the GW-MMADS collaboration (GCN 41177, two candidates recovered by both collaborations). AT2025sib, AT2025srk, and AT2025srm are detected in both r and i band difference images. At the position of AT2025srm and AT2025sib there is a galaxy in the DES template images, and a point source present in the difference images. AT2025srk shows a point source present in the LSSTCam images, but not the DES templates. We caution that AT2025shz may be a variable star, as there is a point source at the location in the DES templates.\n\n| AT name | Observation Date | RA | Dec | r | unc_r | i | unc_i |\n|-----------|------------------|-----------|------------|-------|-------|-------|-------|\n| AT2025sib | 2025-07-29 | 235.548892 | -35.002876 | 20.95 | 0.03 | 20.76 | 0.03 |\n| AT2025srk | 2025-07-29 | 234.755524 | -36.425993 | 21.17 | 0.04 | 21.31 | 0.06 |\n| AT2025srm | 2025-07-29 | 232.987656 | -36.816564 | 21.90 | 0.05 | 22.99 | 0.21 |\n| AT2025shz | 2025-07-29 | 231.072434 | -37.622634 | 22.25 | 0.07 | 21.97 | 0.11 |\n\nAnalysis of these candidates is ongoing.\n\nThis material is based upon work supported in part by the National Science Foundation through Cooperative Agreements AST-1258333 and AST-2241526 and Cooperative Support Agreements AST-1202910 and 2211468 managed by the Association of Universities for Research in Astronomy (AURA), and the Department of Energy under Contract No. DE-AC02-76SF00515 with the SLAC National Accelerator Laboratory managed by Stanford University. Additional Rubin Observatory funding comes from private donations, grants to universities, and in-kind support from LSST-DA Institutional Members.\n\n[1] https://sitcomtn-005.lsst.io, §6\n\n[2] https://lse-163.lsst.io \n\n[3] www.inspirehep.net/literature/2846480 \n\n[4] www.inspirehep.net/literature/1841103\n\n[5] https://pstn-019.lsst.io",
"published": "2025-08-29T19:02:23.755226Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-29T19:02:23.755243Z",
"modified": "2025-08-29T19:02:23.763862Z",
"targets": []
},
{
"id": 3073750,
"topic": "gcn.circulars",
"uuid": "a3dcd5b1-7faa-4bc6-a8ef-0aa2ad35ffbe",
"title": "LIGO/Virgo/KAGRA S250725j: NED Galaxies in the 3-Initial 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/41165"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41165....1C",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: NED Galaxies in the 3-Initial Localization Volume",
"createdOn": 1753457668535,
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"circularId": 41165,
"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 S250725j-3-Initial 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 594 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/S250725j/3 \nTop 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250725j/3/20\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 J152748.68-355739.1| 231.95286| -35.96088| G| 452.82| null| null| null| 13.128| 0.132| 10.686| 0.006|4.47e-06| 4.56e-08|\n|WISEA J153844.18-344009.1| 234.68409| -34.66922| G| 480.22| null| null| null| 12.995| 0.143| 10.976| 0.010|3.62e-06| 3.52e-08|\n|WISEA J153525.42-344743.9| 233.85592| -34.79554| G| 524.15| null| null| null| 13.715| 0.214| 11.189| 0.018|3.34e-06| 2.91e-08|\n|WISEA J152653.58-355046.3| 231.72329| -35.84620| G| 431.02| null| null| null| 13.223| 0.157| 10.966| 0.009|4.06e-06| 2.89e-08|\n|WISEA J154628.27-340002.3| 236.61826| -34.00070| G| 425.21| null| null| null| 13.479| 0.169| 9.563| 0.006|1.10e-06| 2.79e-08|\n|WISEA J153024.70-351033.1| 232.60293| -35.17588| G| 529.76| null| null| null| 12.578| 0.113| 11.182| 0.008|2.90e-06| 2.58e-08|\n|WISEA J153324.20-354028.6| 233.35085| -35.67462| G| 435.53| null| null| null| 13.377| 0.171| 11.600| 0.011|5.94e-06| 2.45e-08|\n|WISEA J153416.18-351536.7| 233.56786| -35.26055| G| 415.65| null| null| null| 13.472| 0.230| 11.551| 0.011|5.56e-06| 2.18e-08|\n|WISEA J153550.83-352815.7| 233.96181| -35.47105| G| 452.48| null| null| null| 12.155| 0.114| 11.835| 0.011|5.59e-06| 2.01e-08|\n|WISEA J152918.46-355636.4| 232.32692| -35.94346| G| 469.28| null| null| null| 13.745| 0.216| 11.703| 0.011|4.59e-06| 1.97e-08|\n|WISEA J153406.90-352554.3| 233.52878| -35.43177| G| 444.26| 0.49| null| null| 12.177| 0.090| 12.031| 0.023|5.84e-06| 1.68e-08|\n|WISEA J153130.18-350639.3| 232.87576| -35.11092| G| 419.28| 0.79| null| null| 12.607| 0.111| 11.785| 0.011|4.73e-06| 1.49e-08|\n|WISEA J153144.43-352246.2| 232.93514| -35.37951| G| 474.13| null| null| null| 12.991| 0.145| 12.199| 0.016|4.99e-06| 1.38e-08|\n|WISEA J153031.02-350955.4| 232.62929| -35.16539| G| 478.85| null| null| null| 13.515| 0.194| 12.117| 0.015|4.17e-06| 1.28e-08|\n|WISEA J153512.75-350712.9| 233.80314| -35.12027| G| 470.25| null| null| null| 13.554| 0.177| 12.400| 0.011|5.07e-06| 1.18e-08|\n|WISEA J152932.42-350115.2| 232.38508| -35.02090| G| 538.67| null| null| null| 13.523| 0.198| 11.824| 0.007|2.30e-06| 1.16e-08|\n|WISEA J154625.51-332529.0| 236.60631| -33.42475| G| 445.85| null| null| null| 12.552| 0.113| 10.145| 0.007|6.91e-07| 1.13e-08|\n|WISEA J153354.06-351626.2| 233.47529| -35.27397| G| 397.36| null| null| null| 13.103| 0.132| 12.174| 0.012|5.35e-06| 1.08e-08|\n|WISEA J153959.24-350547.6| 234.99684| -35.09658| G| 378.08| null| null| null| 13.710| 0.194| 11.652| 0.010|3.45e-06| 1.05e-08|\n|WISEA J153052.19-345946.7| 232.71748| -34.99631| G| 454.26| 0.79| null| null| 12.909| 0.128| 12.253| 0.014|4.22e-06| 1.01e-08|\n\nTable 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250725j 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": "2025-08-04T08:08:55.980732Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-04T08:08:55.980745Z",
"modified": "2025-08-04T08:08:55.984485Z",
"targets": []
},
{
"id": 3073740,
"topic": "gcn.circulars",
"uuid": "adba8037-cbae-4692-a6cc-a455101b4849",
"title": "LIGO/Virgo/KAGRA S250725j: GOTO pre-trigger detection of AT2025sib",
"submitter": "Nusrin Habeeb at University of Leicester <nh312@leicester.ac.uk>",
"authors": "Nusrin Habeeb at University of Leicester <nh312@leicester.ac.uk>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41213"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41213....1G",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: GOTO pre-trigger detection of AT2025sib",
"createdOn": 1753972043624,
"submitter": "Nusrin Habeeb at University of Leicester <nh312@leicester.ac.uk>",
"circularId": 41213,
"submittedHow": "web"
},
"message_text": "\nB. Godson, N. Habeeb, K. Ackley, D. O’Neill, A. Kumar, G. Ramsay, M. J. Dyer, J. Lyman, K. Ulaczyk, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, and J. Casares report on behalf of the GOTO collaboration: \n\nWe report on historical observations of counterpart candidate AT 2025sib (Hall et al. GCN 41177, McMahon et al. GCN 41206) with the Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022, Dyer et al. 2024).\n\nWe find evidence of emission of the source starting at 2025-07-13 08:51 with a 3-sigma observation of L = 20.2 +/- 0.3 AB mag, with our final observation on 2025-07-21 10:11 with L = 20.8 +/- 0.3 AB mag at 3-sigma. We cannot rule out the variable nature of this source and find no evidence of the decay reported in Hall et al. GCN 41177 at these early times. We note that the source appears coincident with an object in the 2MASS Point Source Catalog, 2MASS15421160-3500115 (Cutri et al 2003).\n\nGOTO last covered the field of S250725j serendipitously during survey mode on 2025-07-21. We did not perform follow-up for S250725j due to poor weather conditions at GOTO-South. In addition, we find no evidence of pre-detection emission for the other sources reported in GCN 41177, GCN 41206.\n\nContinued analysis of additional candidates is ongoing.\n\nDifference imaging was performed using deeper template observations. Magnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction. \n\nGOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).\n",
"published": "2025-08-04T08:08:52.889340Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-04T08:08:52.889359Z",
"modified": "2025-08-04T08:08:52.893120Z",
"targets": []
},
{
"id": 3073736,
"topic": "gcn.circulars",
"uuid": "fb292464-1cff-4e40-b3bc-5c64346f9586",
"title": "LIGO/Virgo/KAGRA S250725j: DECam GW-MMADS candidates",
"submitter": "xjh@andrew.cmu.edu",
"authors": "xjh@andrew.cmu.edu",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41177"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41177....1H",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: DECam GW-MMADS candidates",
"createdOn": 1753639609668,
"submitter": "xjh@andrew.cmu.edu",
"circularId": 41177,
"submittedHow": "web"
},
"message_text": "Xander Hall (CMU), Lei Hu (CMU), Tomás Cabrera (CMU), Antonella Palmese (CMU), Igor Andreoni (UNC), Keerthi Kunnumkai (CMU), Brendan O’Connor (CMU), on behalf of the Gravitational Wave MultiMessenger Astronomy DECam Survey (GW-MMADS) team\n\nDECam observed the southern high probability area of the LVK gravitational wave candidate S250725j (GCN 41154) using the wide-field Dark Energy Camera (DECam) on the 4m Blanco telescope. Observations started at 2025-07-25 23:13:43 UTC (Prop ID: 2025A-227091; PI Soares-Santos) and covered the highest 90% probability region of the event (GCN 41168).\n\nWe run the SFFT difference imaging (Hu et al. 2022) on the available images, filter out likely stars and moving objects, visually inspect the remaining transients, and remove transients showing SNR>5 detections predating the gravitational wave alert from ATLAS forced photometry. We reported on TNS new transients within the LVK 99% CI area, and we report here those matched to a NED galaxy (GCN 41165):\n\n| id | AT name | ra | dec | discovery_date (UT) | mag_g | mag_g_err | mag_g-mag_r | NED separation |\n| ------------------------ | ---------- | ---------- | ---------- | ----------------------- | ------ | ----- | ----- | ----- |\n| T202507251524174m373721 | AT 2025shz | 231.072434 | -37.622634 | 2025-07-25 23:29:54.630 | 22.63 | 0.06 | 0.37 | 17.0”\n| T202507251542117m350010* | AT 2025sib | 235.548892 | -35.002876 | 2025-07-25 23:15:43.009 | 22.5 | 0.1 | 0.7 | 2.1”\n| T202507251538092m361517 | AT 2025sia | 234.538140 | -36.254760 | 2025-07-25 23:19:38.393 | 21.74 | 0.03 | 1.06 | 1.1”\n\n\\* - *We note that these transients may have tentative low SNR pre-detections from ATLAS forced photometry.*\n\nWe note that AT 2025shz cannot be excluded as a variable star and that it shows an extremely quick rise in the rz filters between two observations in the same night with a rise of several mag/day. We also note that AT 2025sib, shows a gradual decline in the grz filters between two observations with an average decline of ~0.5 mag/day.\n\nFurther analysis is underway.\n\nWe thank the CTIO and NOIRLab staff for supporting these observations and the data calibration.",
"published": "2025-08-04T08:08:52.837262Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-04T08:08:52.837274Z",
"modified": "2025-08-04T08:08:52.840888Z",
"targets": []
},
{
"id": 3073711,
"topic": "gcn.circulars",
"uuid": "3beaa789-ef7b-4be0-b790-3404f4fa48d0",
"title": "LIGO/Virgo/KAGRA S250725j: DECam DESGW Epoch 1-2 Candidates",
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41206"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41206....1M",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: DECam DESGW Epoch 1-2 Candidates",
"version": 2,
"editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"editedOn": 1753971571108,
"createdOn": 1753923174600,
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"circularId": 41206,
"submittedHow": "web"
},
"message_text": "Isaac McMahon, Sean MacBride, Marcelle Soares-Santos (UZH), Nora Sherman (Boston U.), Simran Kaur (U. of Michigan/UZH), Lillian Joseph (Benedictine U.), Ken Herner, Tom Diehl (Fermilab), reporting on behalf of the Dark Energy Survey Gravitational Wave (DESGW) Team:\n\nAt 2025-07-25 23:13:43 UTC and 2025-07-28 23:13:54 UTC, the Dark Energy Camera (DECam) began the first and second epoch of observations in response to the LVK alert issued for the candidate gravitational-wave event S250725j (GCN 41154). We observed nine fields centered on the following ICRS coordinates:\n| RA | DEC |\n|----------|----------|\n| 231.833836 | -37.23415|\n|234.585764 | -35.2584|\n|232.520774 | -35.64614|\n|233.935432 | -36.84845|\n|236.026051 | -36.42542|\n|230.4476 | -35.99735|\n|233.180871 | -34.0649|\n|236.640727 | -34.83446|\n|229.723284 | -37.58219|\n\nThese pointings cover the 90% localization region of candidate gravitational-wave event S250725j.\n\nAll fields were observed in DECam g, r, i, z filters with 90-second exposures. The limiting magnitudes achieved for epoch 1 were 23.2 in g, 22.9 in r, and 22.6 in i, and 21.6 in z. The limiting magnitudes achieved for epoch 2 were 22.5 in g, 22.6 in r, and 22.3 in i, and 21.6 in z.\n\nWe process the images with our difference imaging pipeline (Herner et al. 2020) using DES and public DECam images as templates. We employ the autoscan machine learning code (Goldstein et al 2015) to reject subtraction artifacts. Candidates were initially selected by requiring at least two high signal to noise detections, which were separated in time in order to reject moving objects. We also require an autoscan score of at least 0.7 on at least one of those detections. We also match our candidates against the ALLWISE, Milliquas, and Quaia AGN catalogs (Secrest et al 2015, Flesch 2023, Storey-Fisher et al 2024) within the LVK localization volume to determine if any correspond to known active galactic nuclei.\n\nAfter candidate selection we report the 3 high confidence candidates listed below, including 2 nuclear candidates (likely active galactic nuclei) and 1 likely supernova. Further observations are ongoing, and we encourage followup of the 3 candidates identified herein.\n\n| TYPE \t| ID \t| ATNAME \t| RA \t| DEC \t| MAG_G \t| MAG_G_ERR \t| MAG_R \t| MAG_R_ERR \t| MAG_I \t| MAG_I_ERR \t| MAG_Z \t| MAG_Z_ERR \t|\n|----------\t|---------\t|--------\t|------------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|\n| SN_LIKE | 3141695 | AT2025srk | 234.755524 | -36.425993 | 21.51 | 0.02 | 21.0 | 0.02 | 21.27 | 0.03 | 22.06 | 0.27 |\n| AGN_LIKE | 3237805 | AT2025srl | 234.90473 | -36.726032 | 23.55 | 0.19 | N/A | N/A | 19.74 | 0.01 | N/A | N/A |\n| AGN_LIKE | 3141486 | AT2025srm | 232.987656 | -36.816564 | 22.43 | 0.06 | 22.07 | 0.04 | 22.74 | 0.17 | 21.21 | 0.05 |\n\nAdditionally, we also recover two of the candidates reported by GW-MMADS (GCN 41177). The candidate AT2025sib is of particular note, as its photometric redshift of z=0.07 reported by 2MASS (Bilicki et al 2014) lies within the LVK 90% volume.\n\n| TYPE \t| ID \t| ATNAME \t| RA \t| DEC \t| MAG_G \t| MAG_G_ERR \t| MAG_R \t| MAG_R_ERR \t| MAG_I \t| MAG_I_ERR \t| MAG_Z \t| MAG_Z_ERR \t|\n|----------\t|---------\t|--------\t|------------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|\n| AGN_LIKE | 3141729 | AT2025shz | 231.072453 | -37.6226 | 22.77 | 0.08 | 22.36 | 0.08 | N/A | N/A | N/A | N/A |\n| SN_LIKE | 3141898 | AT2025sib | 235.548953 | -35.002893 | 21.72 | 0.04 | 20.7 | 0.02 | N/A | N/A | 20.72 | 0.07 |\n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide-ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations.",
"published": "2025-08-04T08:08:50.564703Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-04T08:08:50.564717Z",
"modified": "2025-08-04T08:08:50.568274Z",
"targets": []
},
{
"id": 3073700,
"topic": "gcn.circulars",
"uuid": "b0544886-94f4-4abd-98d2-7b0a702b85a4",
"title": "LIGO/Virgo/KAGRA S250725j: 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/41168"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41168....1L",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: Updated Sky localization",
"createdOn": 1753463096262,
"submitter": "Lorenzo Pompili at Max Planck Institute for Gravitational Physics <lorenzo.pompili@aei.mpg.de>",
"circularId": 41168,
"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 S250725j (GCN Circular 41154). 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/S250725j\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 19 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(15h32m, -36d06m, 3.23d, 1.84d, 158.46d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 380 +/- 93 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": "2025-08-04T08:08:48.460581Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-08-04T08:08:48.460594Z",
"modified": "2025-08-04T08:08:48.464071Z",
"targets": []
},
{
"id": 2370953,
"topic": "gcn.circulars",
"uuid": "558a7ebe-69fc-4b7f-869f-53b644cb53f7",
"title": "LIGO/Virgo/KAGRA S250725j: GOTO pre-trigger detection of AT2025sib",
"submitter": "Nusrin Habeeb at University of Leicester <nh312@leicester.ac.uk>",
"authors": "Nusrin Habeeb at University of Leicester <nh312@leicester.ac.uk>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41213"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: GOTO pre-trigger detection of AT2025sib",
"createdOn": 1753972043624,
"submitter": "Nusrin Habeeb at University of Leicester <nh312@leicester.ac.uk>",
"circularId": 41213,
"submittedHow": "web"
},
"message_text": "\nB. Godson, N. Habeeb, K. Ackley, D. O’Neill, A. Kumar, G. Ramsay, M. J. Dyer, J. Lyman, K. Ulaczyk, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, and J. Casares report on behalf of the GOTO collaboration: \n\nWe report on historical observations of counterpart candidate AT 2025sib (Hall et al. GCN 41177, McMahon et al. GCN 41206) with the Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022, Dyer et al. 2024).\n\nWe find evidence of emission of the source starting at 2025-07-13 08:51 with a 3-sigma observation of L = 20.2 +/- 0.3 AB mag, with our final observation on 2025-07-21 10:11 with L = 20.8 +/- 0.3 AB mag at 3-sigma. We cannot rule out the variable nature of this source and find no evidence of the decay reported in Hall et al. GCN 41177 at these early times. We note that the source appears coincident with an object in the 2MASS Point Source Catalog, 2MASS15421160-3500115 (Cutri et al 2003).\n\nGOTO last covered the field of S250725j serendipitously during survey mode on 2025-07-21. We did not perform follow-up for S250725j due to poor weather conditions at GOTO-South. In addition, we find no evidence of pre-detection emission for the other sources reported in GCN 41177, GCN 41206.\n\nContinued analysis of additional candidates is ongoing.\n\nDifference imaging was performed using deeper template observations. Magnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction. \n\nGOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).\n",
"published": "2025-07-31T14:27:31.306216Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-31T14:27:31.306229Z",
"modified": "2025-07-31T14:27:31.311391Z",
"targets": []
},
{
"id": 2369579,
"topic": "gcn.circulars",
"uuid": "e03edda9-75e8-4e7c-9842-d6a63b29462b",
"title": "LIGO/Virgo/KAGRA S250725j: DECam DESGW Epoch 1-2 Candidates",
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41206"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: DECam DESGW Epoch 1-2 Candidates",
"version": 2,
"editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"editedOn": 1753971571108,
"createdOn": 1753923174600,
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"circularId": 41206,
"submittedHow": "web"
},
"message_text": "Isaac McMahon, Sean MacBride, Marcelle Soares-Santos (UZH), Nora Sherman (Boston U.), Simran Kaur (U. of Michigan/UZH), Lillian Joseph (Benedictine U.), Ken Herner, Tom Diehl (Fermilab), reporting on behalf of the Dark Energy Survey Gravitational Wave (DESGW) Team:\n\nAt 2025-07-25 23:13:43 UTC and 2025-07-28 23:13:54 UTC, the Dark Energy Camera (DECam) began the first and second epoch of observations in response to the LVK alert issued for the candidate gravitational-wave event S250725j (GCN 41154). We observed nine fields centered on the following ICRS coordinates:\n| RA | DEC |\n|----------|----------|\n| 231.833836 | -37.23415|\n|234.585764 | -35.2584|\n|232.520774 | -35.64614|\n|233.935432 | -36.84845|\n|236.026051 | -36.42542|\n|230.4476 | -35.99735|\n|233.180871 | -34.0649|\n|236.640727 | -34.83446|\n|229.723284 | -37.58219|\n\nThese pointings cover the 90% localization region of candidate gravitational-wave event S250725j.\n\nAll fields were observed in DECam g, r, i, z filters with 90-second exposures. The limiting magnitudes achieved for epoch 1 were 23.2 in g, 22.9 in r, and 22.6 in i, and 21.6 in z. The limiting magnitudes achieved for epoch 2 were 22.5 in g, 22.6 in r, and 22.3 in i, and 21.6 in z.\n\nWe process the images with our difference imaging pipeline (Herner et al. 2020) using DES and public DECam images as templates. We employ the autoscan machine learning code (Goldstein et al 2015) to reject subtraction artifacts. Candidates were initially selected by requiring at least two high signal to noise detections, which were separated in time in order to reject moving objects. We also require an autoscan score of at least 0.7 on at least one of those detections. We also match our candidates against the ALLWISE, Milliquas, and Quaia AGN catalogs (Secrest et al 2015, Flesch 2023, Storey-Fisher et al 2024) within the LVK localization volume to determine if any correspond to known active galactic nuclei.\n\nAfter candidate selection we report the 3 high confidence candidates listed below, including 2 nuclear candidates (likely active galactic nuclei) and 1 likely supernova. Further observations are ongoing, and we encourage followup of the 3 candidates identified herein.\n\n| TYPE \t| ID \t| ATNAME \t| RA \t| DEC \t| MAG_G \t| MAG_G_ERR \t| MAG_R \t| MAG_R_ERR \t| MAG_I \t| MAG_I_ERR \t| MAG_Z \t| MAG_Z_ERR \t|\n|----------\t|---------\t|--------\t|------------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|\n| SN_LIKE | 3141695 | AT2025srk | 234.755524 | -36.425993 | 21.51 | 0.02 | 21.0 | 0.02 | 21.27 | 0.03 | 22.06 | 0.27 |\n| AGN_LIKE | 3237805 | AT2025srl | 234.90473 | -36.726032 | 23.55 | 0.19 | N/A | N/A | 19.74 | 0.01 | N/A | N/A |\n| AGN_LIKE | 3141486 | AT2025srm | 232.987656 | -36.816564 | 22.43 | 0.06 | 22.07 | 0.04 | 22.74 | 0.17 | 21.21 | 0.05 |\n\nAdditionally, we also recover two of the candidates reported by GW-MMADS (GCN 41177). The candidate AT2025sib is of particular note, as its photometric redshift of z=0.07 reported by 2MASS (Bilicki et al 2014) lies within the LVK 90% volume.\n\n| TYPE \t| ID \t| ATNAME \t| RA \t| DEC \t| MAG_G \t| MAG_G_ERR \t| MAG_R \t| MAG_R_ERR \t| MAG_I \t| MAG_I_ERR \t| MAG_Z \t| MAG_Z_ERR \t|\n|----------\t|---------\t|--------\t|------------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|\n| AGN_LIKE | 3141729 | AT2025shz | 231.072453 | -37.6226 | 22.77 | 0.08 | 22.36 | 0.08 | N/A | N/A | N/A | N/A |\n| SN_LIKE | 3141898 | AT2025sib | 235.548953 | -35.002893 | 21.72 | 0.04 | 20.7 | 0.02 | N/A | N/A | 20.72 | 0.07 |\n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide-ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations.",
"published": "2025-07-31T14:19:32.144144Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-31T14:19:32.144169Z",
"modified": "2025-07-31T14:19:32.154502Z",
"targets": []
},
{
"id": 2269860,
"topic": "gcn.circulars",
"uuid": "129cb875-1b83-4692-a794-1344e9b92f12",
"title": "LIGO/Virgo/KAGRA S250725j: DECam DESGW Epoch 1-2 Candidates",
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41206"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: DECam DESGW Epoch 1-2 Candidates",
"createdOn": 1753923174600,
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"circularId": 41206,
"submittedHow": "web"
},
"message_text": "Isaac McMahon, Sean MacBride, Marcelle Soares-Santos (UZH), Nora Sherman (Boston U.), Simran Kaur (U. of Michigan/UZH), Lillian Joseph (Benedictine U.), Ken Herner, Tom Diehl (Fermilab), reporting on behalf of the Dark Energy Survey Gravitational Wave (DESGW) Team:\n\nAt 2025-07-25 23:13:43 UTC and 2025-07-28 23:13:54 UTC, the Dark Energy Camera (DECam) began the first and second epoch of observations in response to the LVK alert issued for the candidate gravitational-wave event S250725j (GCN 41154). We observed nine fields centered on the following ICRS coordinates:\n| RA | DEC |\n|----------|----------|\n| 231.833836 | -37.23415|\n|234.585764 | -35.2584|\n|232.520774 | -35.64614|\n|233.935432 | -36.84845|\n|236.026051 | -36.42542|\n|230.4476 | -35.99735|\n|233.180871 | -34.0649|\n|236.640727 | -34.83446|\n|229.723284 | -37.58219|\n\nThese pointings cover the 90% localization region of candidate gravitational-wave event S250725j.\n\nAll fields were observed in DECam g, r, i, z filters with 90-second exposures. The limiting magnitudes achieved for epoch 1 were 23.2 in g, 22.9 in r, and 22.6 in i, and 21.6 in z. The limiting magnitudes achieved for epoch 2 were 22.5 in g, 22.6 in r, and 22.3 in i, and 21.6 in z.\n\nWe process the images with our difference imaging pipeline (Herner et al. 2020) using DES and public DECam images as templates. We employ the autoscan machine learning code (Goldstein et al 2015) to reject subtraction artifacts. Candidates were initially selected by requiring at least two high signal to noise detections, which were separated in time in order to reject moving objects. We also require an autoscan score of at least 0.7 on at least one of those detections. We also match our candidates against the ALLWISE, Milliquas, and Quaia AGN catalogs (Secrest et al 2015, Flesch 2023, Storey-Fisher et al 2024) within the LVK localization volume to determine if any correspond to known active galactic nuclei.\n\nAfter candidate selection we report the 3 high confidence candidates listed below, including 2 nuclear candidates (likely active galactic nuclei) and 1 likely supernova. Further observations are ongoing, and we encourage followup of the 3 candidates identified herein.\n\n| TYPE \t| ID \t| ATNAME \t| RA \t| DEC \t| MAG_G \t| MAG_G_ERR \t| MAG_R \t| MAG_R_ERR \t| MAG_I \t| MAG_I_ERR \t| MAG_Z \t| MAG_Z_ERR \t|\n|----------\t|---------\t|--------\t|------------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|\n| SN_LIKE | 3141695 | AT2025srk | 234.755524 | -36.425993 | 21.51 | 0.02 | 21.0 | 0.02 | 21.27 | 0.03 | 22.06 | 0.27 |\n| AGN_LIKE | 3237805 | AT2025srl | 234.90473 | -36.726032 | 23.55 | 0.19 | N/A | N/A | 19.74 | 0.01 | N/A | N/A |\n| AGN_LIKE | 3141486 | AT2025srm | 232.987656 | -36.816564 | 22.43 | 0.06 | 22.07 | 0.04 | 22.74 | 0.17 | 21.21 | 0.05 |\n\nAdditionally, we also recover two of the candidates reported by GW-MMADS (GCN 41177). The candidate AT2025sib is of particular note, as its photometric redshift reported by 2MASS (Bilicki et al 2014) lies within the LVK 90% volume.\n\n| TYPE \t| ID \t| ATNAME \t| RA \t| DEC \t| MAG_G \t| MAG_G_ERR \t| MAG_R \t| MAG_R_ERR \t| MAG_I \t| MAG_I_ERR \t| MAG_Z \t| MAG_Z_ERR \t|\n|----------\t|---------\t|--------\t|------------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|-------\t|-----------\t|\n| AGN_LIKE | 3141729 | AT2025shz | 231.072453 | -37.6226 | 22.77 | 0.08 | 22.36 | 0.08 | N/A | N/A | N/A | N/A |\n| SN_LIKE | 3141898 | AT2025sib | 235.548953 | -35.002893 | 21.72 | 0.04 | 20.7 | 0.02 | N/A | N/A | 20.72 | 0.07 |\n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide-ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations.",
"published": "2025-07-31T00:53:02.959266Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-31T00:53:02.959289Z",
"modified": "2025-07-31T00:53:02.972587Z",
"targets": []
},
{
"id": 2003338,
"topic": "gcn.circulars",
"uuid": "e22ad38c-9d79-40b9-a82b-3e91223b5834",
"title": "LIGO/Virgo/KAGRA S250725j: 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/41168"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: Updated Sky localization",
"createdOn": 1753463096262,
"submitter": "Lorenzo Pompili at Max Planck Institute for Gravitational Physics <lorenzo.pompili@aei.mpg.de>",
"circularId": 41168,
"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 S250725j (GCN Circular 41154). 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/S250725j\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 19 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(15h32m, -36d06m, 3.23d, 1.84d, 158.46d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 380 +/- 93 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": "2025-07-25T17:05:04.066161Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-25T17:05:04.066181Z",
"modified": "2025-07-25T17:05:04.076286Z",
"targets": []
},
{
"id": 1966873,
"topic": "gcn.circulars",
"uuid": "689ec56e-08d0-42ff-bcd0-c022ef9111b3",
"title": "LIGO/Virgo/KAGRA S250725j: NED Galaxies in the 3-Initial 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/41165"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": "LIGO/Virgo/KAGRA S250725j: NED Galaxies in the 3-Initial Localization Volume",
"createdOn": 1753457668535,
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"circularId": 41165,
"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 S250725j-3-Initial 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 594 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/S250725j/3 \nTop 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250725j/3/20\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 J152748.68-355739.1| 231.95286| -35.96088| G| 452.82| null| null| null| 13.128| 0.132| 10.686| 0.006|4.47e-06| 4.56e-08|\n|WISEA J153844.18-344009.1| 234.68409| -34.66922| G| 480.22| null| null| null| 12.995| 0.143| 10.976| 0.010|3.62e-06| 3.52e-08|\n|WISEA J153525.42-344743.9| 233.85592| -34.79554| G| 524.15| null| null| null| 13.715| 0.214| 11.189| 0.018|3.34e-06| 2.91e-08|\n|WISEA J152653.58-355046.3| 231.72329| -35.84620| G| 431.02| null| null| null| 13.223| 0.157| 10.966| 0.009|4.06e-06| 2.89e-08|\n|WISEA J154628.27-340002.3| 236.61826| -34.00070| G| 425.21| null| null| null| 13.479| 0.169| 9.563| 0.006|1.10e-06| 2.79e-08|\n|WISEA J153024.70-351033.1| 232.60293| -35.17588| G| 529.76| null| null| null| 12.578| 0.113| 11.182| 0.008|2.90e-06| 2.58e-08|\n|WISEA J153324.20-354028.6| 233.35085| -35.67462| G| 435.53| null| null| null| 13.377| 0.171| 11.600| 0.011|5.94e-06| 2.45e-08|\n|WISEA J153416.18-351536.7| 233.56786| -35.26055| G| 415.65| null| null| null| 13.472| 0.230| 11.551| 0.011|5.56e-06| 2.18e-08|\n|WISEA J153550.83-352815.7| 233.96181| -35.47105| G| 452.48| null| null| null| 12.155| 0.114| 11.835| 0.011|5.59e-06| 2.01e-08|\n|WISEA J152918.46-355636.4| 232.32692| -35.94346| G| 469.28| null| null| null| 13.745| 0.216| 11.703| 0.011|4.59e-06| 1.97e-08|\n|WISEA J153406.90-352554.3| 233.52878| -35.43177| G| 444.26| 0.49| null| null| 12.177| 0.090| 12.031| 0.023|5.84e-06| 1.68e-08|\n|WISEA J153130.18-350639.3| 232.87576| -35.11092| G| 419.28| 0.79| null| null| 12.607| 0.111| 11.785| 0.011|4.73e-06| 1.49e-08|\n|WISEA J153144.43-352246.2| 232.93514| -35.37951| G| 474.13| null| null| null| 12.991| 0.145| 12.199| 0.016|4.99e-06| 1.38e-08|\n|WISEA J153031.02-350955.4| 232.62929| -35.16539| G| 478.85| null| null| null| 13.515| 0.194| 12.117| 0.015|4.17e-06| 1.28e-08|\n|WISEA J153512.75-350712.9| 233.80314| -35.12027| G| 470.25| null| null| null| 13.554| 0.177| 12.400| 0.011|5.07e-06| 1.18e-08|\n|WISEA J152932.42-350115.2| 232.38508| -35.02090| G| 538.67| null| null| null| 13.523| 0.198| 11.824| 0.007|2.30e-06| 1.16e-08|\n|WISEA J154625.51-332529.0| 236.60631| -33.42475| G| 445.85| null| null| null| 12.552| 0.113| 10.145| 0.007|6.91e-07| 1.13e-08|\n|WISEA J153354.06-351626.2| 233.47529| -35.27397| G| 397.36| null| null| null| 13.103| 0.132| 12.174| 0.012|5.35e-06| 1.08e-08|\n|WISEA J153959.24-350547.6| 234.99684| -35.09658| G| 378.08| null| null| null| 13.710| 0.194| 11.652| 0.010|3.45e-06| 1.05e-08|\n|WISEA J153052.19-345946.7| 232.71748| -34.99631| G| 454.26| 0.79| null| null| 12.909| 0.128| 12.253| 0.014|4.22e-06| 1.01e-08|\n\nTable 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250725j 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": "2025-07-25T16:01:53.663750Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-25T16:01:53.663767Z",
"modified": "2025-07-25T16:01:53.670528Z",
"targets": []
},
{
"id": 1850061,
"topic": "gcn.circulars",
"uuid": "f44880c6-962b-4b74-89ce-8f2d3cea2134",
"title": " LIGO/Virgo/KAGRA S250725j: Identification of a GW compact binary merger candidate",
"submitter": "Hanlin Song and Junjie Zhao at Peking University and Henan Academy of Sciences <hanlin@stu.pku.edu.cn>",
"authors": "Hanlin Song and Junjie Zhao at Peking University and Henan Academy of Sciences <hanlin@stu.pku.edu.cn>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/41154"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250725j",
"subject": " LIGO/Virgo/KAGRA S250725j: Identification of a GW compact binary merger candidate",
"createdOn": 1753418899877,
"submitter": "Hanlin Song and Junjie Zhao at Peking University and Henan Academy of Sciences <hanlin@stu.pku.edu.cn>",
"circularId": 41154,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250725j during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-07-25 04:09:44.252 UTC (GPS time: 1437451802.252). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS250725j is an event of interest because its false alarm rate, as estimated by the online analysis, is 4.3e-11 Hz, or about one in 1e3 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250725j\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), 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%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <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,0, an initial localization generated by BAYESTAR [3], distributed via GCN and SCiMMA notices about 22 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN and SCiMMA notices about 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 well fit by an ellipse with an area of 28 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(15h34m, -35d25m, 3.97d, 2.25d, 153.93d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 478 +/- 107 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008\n [2] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [3] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n\n",
"published": "2025-07-25T06:11:23.931652Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-25T06:11:23.931683Z",
"modified": "2025-07-25T06:11:23.936297Z",
"targets": []
}
]
},
{
"event_id": "S250725bw",
"sequences": [
{
"id": 9383,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2008714,
"topic": "igwn.gwalert",
"uuid": "67f90ff4-ff0b-4146-b7cd-8c2be286dd2f",
"title": "S250725bw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250725bw/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250725bw/view/"
},
"event": {
"far": 7.114890806678533e-06,
"time": "2025-07-25T17:26:33.820Z",
"group": "CBC",
"search": "AllSky",
"area_50": 575.3357937922551,
"area_90": 2607.6853556710953,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.005275362318840579,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "ad146a44df9fad31a3d8820a094d44f8",
"classification": {
"BBH": 0.1872691693822804,
"BNS": 3.145319251592689e-16,
"NSBH": 2.2740323445562272e-14,
"Terrestrial": 0.8127308306176966
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-07-25T17:27:01Z",
"superevent_id": "S250725bw",
"external_coinc": null
},
"message_text": "",
"published": "2025-07-25T17:27:02.628839Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-07-25T17:27:02.628860Z",
"modified": "2025-07-25T17:27:02.636054Z"
}
},
{
"id": 9384,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2009837,
"topic": "igwn.gwalert",
"uuid": "af7c6bd3-3e53-4208-a55d-cd288f09b85f",
"title": "S250725bw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250725bw/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S250725bw/view/"
},
"event": {
"far": 7.114890806678533e-06,
"time": "2025-07-25T17:26:33.827Z",
"group": "CBC",
"search": "AllSky",
"area_50": 553.7239824280674,
"area_90": 2054.5908434769367,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.005275362318840579,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1",
"V1"
],
"significant": false,
"skymap_hash": "de7c4c6fd02eeac49bb8bf792211b99e",
"classification": {
"BBH": 0.1872691693822804,
"BNS": 3.145319251592689e-16,
"NSBH": 2.2740323445562272e-14,
"Terrestrial": 0.8127308306176966
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-07-25T17:31:37Z",
"superevent_id": "S250725bw",
"external_coinc": null
},
"message_text": "",
"published": "2025-07-25T17:31:38.200900Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-07-25T17:31:38.200921Z",
"modified": "2025-07-25T17:31:38.206862Z"
}
}
],
"references": []
},
{
"event_id": "S250725cd",
"sequences": [
{
"id": 9387,
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