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"title": "LIGO/Virgo/KAGRA S230919bj: Upper limits from Swift/BAT-GUANO",
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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 Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S250701bq (GCN Circular 40880). 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/S250701bq\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 25010 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 480 +/- 118 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",
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"references": [
{
"id": 421264,
"topic": "gcn.circulars",
"uuid": "bf6146ce-6259-4a70-9bf7-b2b16ddf7273",
"title": "LIGO/Virgo/KAGRA S250629ae: 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/41057"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41057....1W",
"eventId": "LIGO/Virgo/KAGRA S250629ae",
"subject": "LIGO/Virgo/KAGRA S250629ae: Upper limits from Swift/BAT-GUANO",
"createdOn": 1752158619762,
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"circularId": 41057,
"submittedHow": "web"
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"message_text": "Maia Williams (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), James DeLaunay (PSU), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), Aaron Tohuvavohu (Caltech) report:\n\nSwift/BAT was observing 50.9% of the GW localization probability ([Bilby.multiorder.fits](https://gracedb.ligo.org/api/superevents/S250629ae/files/Bilby.multiorder.fits)) at merger time. A fraction 42.48% 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 |2.96 |2.54 |2.33 |2.73 \n|1.024 |1.51 |1.29 |1.19 |1.39 \n|4.096 |0.81 |0.69 |0.63 |0.74 \n|16.384 |0.49 |0.42 |0.39 |0.45 \n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://zenodo.org/records/15843728\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": "2025-07-14T08:08:45.396806Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:08:45.396826Z",
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{
"id": 421162,
"topic": "gcn.circulars",
"uuid": "80e8a889-c6b1-45a7-9b9b-698e3955cd59",
"title": "LIGO/Virgo/KAGRA S250629ae: Identification of a GW compact binary merger candidate",
"submitter": "林峻哲Lin, Chun-Che <lupin@phys.ncku.edu.tw>",
"authors": "林峻哲Lin, Chun-Che <lupin@phys.ncku.edu.tw>",
"data": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.40867....1L",
"eventId": "LIGO/Virgo/KAGRA S250629ae",
"subject": "LIGO/Virgo/KAGRA S250629ae: Identification of a GW compact binary merger candidate",
"createdOn": 1751180162146,
"submitter": "林峻哲Lin, Chun-Che <lupin@phys.ncku.edu.tw>",
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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 S250629ae during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-06-29 05:50:36.925 UTC (GPS time: 1435211454.925). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], and PyCBC Live [5] analysis pipelines.\n\nS250629ae is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.2e-08 Hz, or about one in 11 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250629ae\n\nThe classification of the GW signal, in order of descending probability, is BBH (98%), Terrestrial (2%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that at least one of the compact objects is consistent with a neutron star mass (HasNS) is <1%. [6] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nThe source chirp mass falls with highest probability in the bin (22.0, 44.0) solar masses, assuming the candidate is astrophysical in origin.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [7], distributed via GCN and SCiMMA notices about 40 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 3184 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4550 +/- 1295 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",
"published": "2025-07-14T08:08:38.312884Z",
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{
"id": 421098,
"topic": "gcn.circulars",
"uuid": "dbfa3ea0-3296-4d7c-9bb3-621fbe7ce457",
"title": "LIGO/Virgo/KAGRA S250629ae: Updated Sky localization",
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
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"bibcode": "2025GCN.40870....1L",
"eventId": "LIGO/Virgo/KAGRA S250629ae",
"subject": "LIGO/Virgo/KAGRA S250629ae: Updated Sky localization",
"createdOn": 1751203908651,
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"circularId": 40870,
"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 S250629ae (GCN Circular 40867). 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/S250629ae\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 2834 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 7075 +/- 2116 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": "2025-07-14T08:08:13.421935Z",
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{
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"topic": "gcn.circulars",
"uuid": "3afbb589-6d1f-485e-bfe4-d408c1b45fea",
"title": "LIGO/Virgo/KAGRA S250629ae: Upper limits from Swift/BAT-GUANO",
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"authors": "Maia Williams at PSU <mjw6837@psu.edu>",
"data": {
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"subject": "LIGO/Virgo/KAGRA S250629ae: Upper limits from Swift/BAT-GUANO",
"createdOn": 1752158619762,
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
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"submittedHow": "web"
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"message_text": "Maia Williams (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), James DeLaunay (PSU), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), Aaron Tohuvavohu (Caltech) report:\n\nSwift/BAT was observing 50.9% of the GW localization probability ([Bilby.multiorder.fits](https://gracedb.ligo.org/api/superevents/S250629ae/files/Bilby.multiorder.fits)) at merger time. A fraction 42.48% 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 |2.96 |2.54 |2.33 |2.73 \n|1.024 |1.51 |1.29 |1.19 |1.39 \n|4.096 |0.81 |0.69 |0.63 |0.74 \n|16.384 |0.49 |0.42 |0.39 |0.45 \n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://zenodo.org/records/15843728\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": "2025-07-10T14:43:48.867021Z",
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{
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"topic": "gcn.circulars",
"uuid": "cf0de2bd-c572-48ec-a522-ba829db02651",
"title": "LIGO/Virgo/KAGRA S250629ae: Updated Sky localization",
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
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"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
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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 S250629ae (GCN Circular 40867). 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/S250629ae\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 2834 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 7075 +/- 2116 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": "2025-06-29T13:31:56.617059Z",
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{
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"title": "LIGO/Virgo/KAGRA S250629ae: Identification of a GW compact binary merger candidate",
"submitter": "林峻哲Lin, Chun-Che <lupin@phys.ncku.edu.tw>",
"authors": "林峻哲Lin, Chun-Che <lupin@phys.ncku.edu.tw>",
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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 S250629ae during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-06-29 05:50:36.925 UTC (GPS time: 1435211454.925). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], and PyCBC Live [5] analysis pipelines.\n\nS250629ae is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.2e-08 Hz, or about one in 11 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250629ae\n\nThe classification of the GW signal, in order of descending probability, is BBH (98%), Terrestrial (2%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that at least one of the compact objects is consistent with a neutron star mass (HasNS) is <1%. [6] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nThe source chirp mass falls with highest probability in the bin (22.0, 44.0) solar masses, assuming the candidate is astrophysical in origin.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [7], distributed via GCN and SCiMMA notices about 40 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 3184 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4550 +/- 1295 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",
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"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Wed 18 Jun 25 20:23:39 UT\nNOTICE_TYPE: ICECUBE Cascade RETRACTION\nEVENT_NAME: IceCubeCascade-250613a\nSTREAM: 26\nRUN_NUM: 141029\nEVENT_NUM: 8144692\nSRC_RA: 247.6286d {+16h 30m 31s} (J2000),\n 247.9191d {+16h 31m 41s} (current),\n 247.0581d {+16h 28m 14s} (1950)\nSRC_DEC: +15.1842d {+15d 11' 03\"} (J2000),\n +15.1306d {+15d 07' 50\"} (current),\n +15.2914d {+15d 17' 29\"} (1950)\nSRC_ERROR: 7.16 [deg radius, stat+systematic, 90% containment]\nSRC_ERROR50: 3.93 [deg radius, stat+systematic, 50% containment]\nDISCOVERY_DATE: 20839 TJD; 164 DOY; 25/06/13 (yy/mm/dd)\nDISCOVERY_TIME: 40176 SOD {11:09:36.42} UT\nREVISION: 1\nENERGY: 1.00 [TeV]\nSIGNALNESS: 0.0000e+00 [dn]\nFAR: 0.3110 [yr^-1]\nSUN_POSTN: 87.65d {+05h 50m 36s} +23.42d {+23d 25' 04\"}\nSUN_DIST: 136.89 [deg] Sun_angle= -10.7 [hr] (East of Sun)\nMOON_POSTN: 358.21d {+23h 52m 51s} -0.08d {-00d 04' 31\"}\nMOON_DIST: 109.58 [deg]\nGAL_COORDS: 31.42, 37.95 [deg] galactic lon,lat of the event\nECL_COORDS: 242.80, 36.53 [deg] ecliptic lon,lat of the event\nSKYMAP_FITS_URL: https://roc.icecube.wisc.edu/public/hese_cascades/hese_60839_run00141029.evt000008144692.fits\nSKYMAP_PNG_URL: https://roc.icecube.wisc.edu/public/hese_cascades/hese_60839_run00141029.evt000008144692.png\nCOMMENTS: IceCube Cascade event. \nCOMMENTS: The position error is the combined statistical and the systematic. \nCOMMENTS: \nCOMMENTS: NOTE: This is a RETRACTION. The event is no longer considered to be astrophysical in origin. \nCOMMENTS: \n",
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"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Wed 18 Jun 25 20:23:39 UT\nNOTICE_TYPE: ICECUBE Cascade RETRACTION\nEVENT_NAME: IceCubeCascade-250613a\nSTREAM: 26\nRUN_NUM: 141029\nEVENT_NUM: 8144692\nSRC_RA: 247.6286d {+16h 30m 31s} (J2000),\n 247.9191d {+16h 31m 41s} (current),\n 247.0581d {+16h 28m 14s} (1950)\nSRC_DEC: +15.1842d {+15d 11' 03\"} (J2000),\n +15.1306d {+15d 07' 50\"} (current),\n +15.2914d {+15d 17' 29\"} (1950)\nSRC_ERROR: 7.16 [deg radius, stat+systematic, 90% containment]\nSRC_ERROR50: 3.93 [deg radius, stat+systematic, 50% containment]\nDISCOVERY_DATE: 20839 TJD; 164 DOY; 25/06/13 (yy/mm/dd)\nDISCOVERY_TIME: 40176 SOD {11:09:36.42} UT\nREVISION: 1\nENERGY: 1.00 [TeV]\nSIGNALNESS: 0.0000e+00 [dn]\nFAR: 0.3110 [yr^-1]\nSUN_POSTN: 87.65d {+05h 50m 36s} +23.42d {+23d 25' 04\"}\nSUN_DIST: 136.89 [deg] Sun_angle= -10.7 [hr] (East of Sun)\nMOON_POSTN: 358.21d {+23h 52m 51s} -0.08d {-00d 04' 31\"}\nMOON_DIST: 109.58 [deg]\nGAL_COORDS: 31.42, 37.95 [deg] galactic lon,lat of the event\nECL_COORDS: 242.80, 36.53 [deg] ecliptic lon,lat of the event\nSKYMAP_FITS_URL: https://roc.icecube.wisc.edu/public/hese_cascades/hese_60839_run00141029.evt000008144692.fits\nSKYMAP_PNG_URL: https://roc.icecube.wisc.edu/public/hese_cascades/hese_60839_run00141029.evt000008144692.png\nCOMMENTS: IceCube Cascade event. \nCOMMENTS: The position error is the combined statistical and the systematic. \nCOMMENTS: \nCOMMENTS: NOTE: This is a RETRACTION. The event is no longer considered to be astrophysical in origin. \nCOMMENTS: \n",
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{
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"title": "S250628am - INITIAL",
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"references": [
{
"id": 421242,
"topic": "gcn.circulars",
"uuid": "99dda4e0-7644-4e48-8e9b-bbf1cf998f46",
"title": "LIGO/Virgo/KAGRA S250628am: Updated Sky localization",
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40866"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.40866....1L",
"eventId": "LIGO/Virgo/KAGRA S250628am",
"subject": "LIGO/Virgo/KAGRA S250628am: Updated Sky localization",
"createdOn": 1751144996541,
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"circularId": 40866,
"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 S250628am (GCN Circular 40863). 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/S250628am\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 287 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 902 +/- 223 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": "2025-07-14T08:08:44.115897Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:08:44.115909Z",
"modified": "2025-07-14T08:08:44.119395Z",
"targets": []
},
{
"id": 421199,
"topic": "gcn.circulars",
"uuid": "619d5132-c74b-460e-853a-a39530bf06f1",
"title": " LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate (duplicate submission)",
"submitter": "rodrigo.cuzinatto@unifal-mg.edu.br",
"authors": "rodrigo.cuzinatto@unifal-mg.edu.br",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40868"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.40868....1C",
"eventId": "LIGO/Virgo/KAGRA S250628am",
"subject": " LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate (duplicate submission)",
"version": 3,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
"editedOn": 1751291563711,
"createdOn": 1751201727753,
"submitter": "rodrigo.cuzinatto@unifal-mg.edu.br",
"circularId": 40868,
"submittedHow": "web"
},
"message_text": "This is a duplicate of Circular [40863](https://gcn.nasa.gov/circulars/40863).",
"published": "2025-07-14T08:08:39.692071Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:08:39.692092Z",
"modified": "2025-07-14T08:08:39.695810Z",
"targets": []
},
{
"id": 421096,
"topic": "gcn.circulars",
"uuid": "7fe46e24-9eef-46e0-922f-44ac27f861a5",
"title": "LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate",
"submitter": "F. Llamas <francisco.llamas@ligo.org>",
"authors": "F. Llamas <francisco.llamas@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.40863....1L",
"eventId": "LIGO/Virgo/KAGRA S250628am",
"subject": "LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate",
"createdOn": 1751137725933,
"submitter": "F. Llamas <francisco.llamas@ligo.org>",
"circularId": 40863,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250628am during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-06-28 18:23:19.785 UTC (GPS time: 1435170217.785). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], PyCBC Live [5], and SPIIR [6] analysis pipelines.\n\nS250628am is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.7e-14 Hz, or about one in 1e6 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250628am\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%. [7] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [7] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nThe source chirp mass falls with highest probability in the bin (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 [8], distributed via GCN and SCiMMA notices about 32 seconds after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [8], distributed via GCN and SCiMMA notices about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 427 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1112 +/- 273 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004\n [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\n [3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008\n [4] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [5] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a\n [6] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023\n [7] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [8] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
"published": "2025-07-14T08:08:13.397298Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-07-14T08:08:13.397311Z",
"modified": "2025-07-14T08:08:13.400720Z",
"targets": []
},
{
"id": 331854,
"topic": "gcn.circulars",
"uuid": "0197e7cc-eea0-4025-a412-67cb7461ce0d",
"title": " LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate (duplicate submission)",
"submitter": "rodrigo.cuzinatto@unifal-mg.edu.br",
"authors": "rodrigo.cuzinatto@unifal-mg.edu.br",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40868"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250628am",
"subject": " LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate (duplicate submission)",
"version": 3,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
"editedOn": 1751291563711,
"createdOn": 1751201727753,
"submitter": "rodrigo.cuzinatto@unifal-mg.edu.br",
"circularId": 40868,
"submittedHow": "web"
},
"message_text": "This is a duplicate of Circular [40863](https://gcn.nasa.gov/circulars/40863).",
"published": "2025-06-30T13:52:44.475627Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-06-30T13:52:44.475646Z",
"modified": "2025-06-30T13:52:44.492270Z",
"targets": []
},
{
"id": 331849,
"topic": "gcn.circulars",
"uuid": "c941f724-779a-4a16-930d-d7e4901742cb",
"title": " LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate (duplicate submission)",
"submitter": "rodrigo.cuzinatto@unifal-mg.edu.br",
"authors": "rodrigo.cuzinatto@unifal-mg.edu.br",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40868"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250628am",
"subject": " LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate (duplicate submission)",
"version": 2,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
"editedOn": 1751291505855,
"createdOn": 1751201727753,
"submitter": "rodrigo.cuzinatto@unifal-mg.edu.br",
"circularId": 40868,
"submittedHow": "web"
},
"message_text": "This is a duplicate of Circular 40863.",
"published": "2025-06-30T13:51:50.132411Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-06-30T13:51:50.132431Z",
"modified": "2025-06-30T13:51:50.162789Z",
"targets": []
},
{
"id": 325027,
"topic": "gcn.circulars",
"uuid": "54f80e77-ea4e-46c7-a597-a80f908b0424",
"title": " LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate",
"submitter": "rodrigo.cuzinatto@unifal-mg.edu.br",
"authors": "rodrigo.cuzinatto@unifal-mg.edu.br",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40868"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250628am",
"subject": " LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate",
"createdOn": 1751201727753,
"submitter": "rodrigo.cuzinatto@unifal-mg.edu.br",
"circularId": 40868,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250628am during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-06-28 18:23:19.785 UTC (GPS time: 1435170217.785). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], PyCBC Live [5], and SPIIR [6] analysis pipelines.\n\nS250628am is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.7e-14 Hz, or about one in 1e6 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250628am\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%. [7] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [7] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nThe source chirp mass falls with highest probability in the bin (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 [8], distributed via GCN and SCiMMA notices about 32 seconds after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [8], distributed via GCN and SCiMMA notices about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 427 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1112 +/- 273 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004\n [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\n [3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008\n [4] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [5] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a\n [6] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023\n [7] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [8] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
"published": "2025-06-29T12:55:35.595627Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-06-29T12:55:35.595643Z",
"modified": "2025-06-29T12:55:35.599245Z",
"targets": []
},
{
"id": 315256,
"topic": "gcn.circulars",
"uuid": "fcd63390-d215-4922-affb-8664f5363074",
"title": "LIGO/Virgo/KAGRA S250628am: Updated Sky localization",
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"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 S250628am",
"subject": "LIGO/Virgo/KAGRA S250628am: Updated Sky localization",
"createdOn": 1751144996541,
"submitter": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"circularId": 40866,
"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 S250628am (GCN Circular 40863). 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/S250628am\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 287 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 902 +/- 223 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": "2025-06-29T06:22:11.275430Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-06-29T06:22:11.275448Z",
"modified": "2025-06-29T06:22:11.278217Z",
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},
{
"id": 315253,
"topic": "gcn.circulars",
"uuid": "5af4cc3a-a935-4267-85c7-0a22addb181b",
"title": "LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate",
"submitter": "F. Llamas <francisco.llamas@ligo.org>",
"authors": "F. Llamas <francisco.llamas@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40863"
},
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"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250628am",
"subject": "LIGO/Virgo/KAGRA S250628am: Identification of a GW compact binary merger candidate",
"createdOn": 1751137725933,
"submitter": "F. Llamas <francisco.llamas@ligo.org>",
"circularId": 40863,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250628am during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-06-28 18:23:19.785 UTC (GPS time: 1435170217.785). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], PyCBC Live [5], and SPIIR [6] analysis pipelines.\n\nS250628am is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.7e-14 Hz, or about one in 1e6 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250628am\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%. [7] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [7] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nThe source chirp mass falls with highest probability in the bin (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 [8], distributed via GCN and SCiMMA notices about 32 seconds after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [8], distributed via GCN and SCiMMA notices about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 427 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1112 +/- 273 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004\n [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\n [3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008\n [4] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [5] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a\n [6] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023\n [7] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [8] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
"published": "2025-06-29T06:22:11.243425Z",
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"retracted": false,
"created": "2025-06-29T06:22:11.243437Z",
"modified": "2025-06-29T06:22:11.246637Z",
"targets": []
}
]
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"title": "S250629ca - PRELIMINARY",
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"title": "S250630s - PRELIMINARY",
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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 S250629bs during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2025-06-29 12:13:04.377 UTC (GPS time: 1435234402.377). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], and MBTA [4] analysis pipelines.\n\nS250629bs is an event of interest because its false alarm rate, as estimated by the online analysis, is 4.3e-08 Hz, or about one in 8 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250629bs\n\nThe classification of the GW signal, in order of descending probability, is BBH (94%), Terrestrial (6%), 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 23 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 4 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 3008 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1811 +/- 561 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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"topic": "gcn.circulars",
"uuid": "a79fcdeb-a095-4c06-9d3c-a569ad3f39fa",
"title": "LIGO/Virgo/KAGRA S250629bs: Upper limits from Swift/BAT-GUANO",
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"authors": "Maia Williams at PSU <mjw6837@psu.edu>",
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"message_text": "Maia Williams (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), James DeLaunay (PSU), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), Aaron Tohuvavohu (Caltech) report:\n\nSwift/BAT was observing 86.28% of the GW localization probability ([Bilby.multiorder.fits](https://gracedb.ligo.org/api/superevents/S250629bs/files/Bilby.multiorder.fits)) at merger time. A fraction 64.89% 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 |3.65 |3.14 |2.87 |3.39 \n|1.024 |1.87 |1.61 |1.47 |1.74 \n|4.096 |1.02 |0.88 |0.80 |0.95 \n|16.384 |0.65 |0.56 |0.51 |0.60 \n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://zenodo.org/records/15843754\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/",
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"title": "LIGO/Virgo/KAGRA S250629bs: Updated Sky localization",
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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) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S250629bs (GCN Circular 40869). 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/S250629bs\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 2998 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4847 +/- 1746 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",
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"title": "LIGO/Virgo/KAGRA S250629bs: Upper limits from Swift/BAT-GUANO",
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"message_text": "Maia Williams (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), James DeLaunay (PSU), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), Aaron Tohuvavohu (Caltech) report:\n\nSwift/BAT was observing 86.28% of the GW localization probability ([Bilby.multiorder.fits](https://gracedb.ligo.org/api/superevents/S250629bs/files/Bilby.multiorder.fits)) at merger time. A fraction 64.89% 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 |3.65 |3.14 |2.87 |3.39 \n|1.024 |1.87 |1.61 |1.47 |1.74 \n|4.096 |1.02 |0.88 |0.80 |0.95 \n|16.384 |0.65 |0.56 |0.51 |0.60 \n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://zenodo.org/records/15843754\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/",
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"topic": "gcn.circulars",
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"title": "LIGO/Virgo/KAGRA S250629bs: Updated Sky localization",
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"authors": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
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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) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S250629bs (GCN Circular 40869). 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/S250629bs\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 2998 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4847 +/- 1746 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",
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{
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"title": "LIGO/Virgo/KAGRA S250629bs: Identification of a GW compact binary merger candidate",
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"authors": "rodrigo.cuzinatto@unifal-mg.edu.br",
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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 S250629bs during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2025-06-29 12:13:04.377 UTC (GPS time: 1435234402.377). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], and MBTA [4] analysis pipelines.\n\nS250629bs is an event of interest because its false alarm rate, as estimated by the online analysis, is 4.3e-08 Hz, or about one in 8 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250629bs\n\nThe classification of the GW signal, in order of descending probability, is BBH (94%), Terrestrial (6%), 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 23 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 4 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 3008 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1811 +/- 561 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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"title": "S250701bp - UPDATE",
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{
"id": 421224,
"topic": "gcn.circulars",
"uuid": "318a2a6b-c95f-4c90-9b13-05aa2efd701a",
"title": "LIGO/Virgo/KAGRA S250701bp: Updated Sky localization",
"submitter": "lucy.thomas@ligo.org",
"authors": "lucy.thomas@ligo.org",
"data": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.4.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.41029....1L",
"eventId": "LIGO/Virgo/KAGRA S250701bp",
"subject": "LIGO/Virgo/KAGRA S250701bp: Updated Sky localization",
"createdOn": 1751987119429,
"submitter": "lucy.thomas@ligo.org",
"circularId": 41029,
"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 Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S250701bp (GCN Circular 40879). 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/S250701bp\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 26503 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 939 +/- 300 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] 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",
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"created": "2025-07-14T08:08:40.920273Z",
"modified": "2025-07-14T08:08:40.923655Z",
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{
"id": 421135,
"topic": "gcn.circulars",
"uuid": "740f8eab-4fce-45c5-8f26-db2ffeeeba46",
"title": "LIGO/Virgo/KAGRA S250701bp: Identification of a GW compact binary merger candidate",
"submitter": "mayara.pacheco@inpe.br",
"authors": "mayara.pacheco@inpe.br",
"data": {
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"bibcode": "2025GCN.40879....1L",
"eventId": "LIGO/Virgo/KAGRA S250701bp",
"subject": "LIGO/Virgo/KAGRA S250701bp: Identification of a GW compact binary merger candidate",
"version": 2,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Keita Kawabe at LIGO Hanford <kkawabe@caltech.edu>",
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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 S250701bp during real-time processing of data from LIGO Livingston Observatory (L1) at 2025-07-01 20:34:40.856 UTC (GPS time: 1435437298.856). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS250701bp is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.1e-17 Hz, or about one in 1e9 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250701bp\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 (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 [3], distributed via GCN and SCiMMA notices about 24 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN and SCiMMA notices about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 24220 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 958 +/- 300 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] 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",
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"uuid": "79e05452-2c6d-44a1-a71e-e67dd82fa928",
"title": "LIGO/Virgo/KAGRA S250701bp: Updated Sky localization",
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"data": {
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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 Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S250701bp (GCN Circular 40879). 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/S250701bp\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 26503 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 939 +/- 300 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] 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",
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"created": "2025-07-08T15:05:20.754018Z",
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{
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"topic": "gcn.circulars",
"uuid": "4d11ea2f-172b-417f-892d-0d8d3809599d",
"title": "LIGO/Virgo/KAGRA S250701bp: 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 S250701bp during real-time processing of data from LIGO Livingston Observatory (L1) at 2025-07-01 20:34:40.856 UTC (GPS time: 1435437298.856). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS250701bp is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.1e-17 Hz, or about one in 1e9 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250701bp\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 (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 [3], distributed via GCN and SCiMMA notices about 24 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN and SCiMMA notices about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 24220 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 958 +/- 300 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] 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",
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{
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"topic": "gcn.circulars",
"uuid": "09457277-a2d7-4f41-a1cc-59d9036cbd9e",
"title": "LIGO/Virgo/KAGRA S250701bp: Identification of a GW compact binary merger candidate",
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"message_text": "//////////////////////////////////////////////////////////////////////\nTITLE: GCN/LVC NOTICE\nNOTICE_DATE: Tue 01 Jul 25 20:35:07 UT\nNOTICE_TYPE: LVC Preliminary\nTRIGGER_NUM: S250701bp\nTRIGGER_DATE: 20857 TJD; 182 DOY; 2025/07/01 (yyyy/mm/dd)\nTRIGGER_TIME: 74080.857846 SOD {20:34:40.857846} UT\nSEQUENCE_NUM: 1\nGROUP_TYPE: 1 = CBC\nSEARCH_TYPE: 1 = AllSky\nPIPELINE_TYPE: 4 = gstlal\nFAR: 7.698e-18 [Hz] (one per 1503440542705.9 days) (one per 4119015185.50 years)\nPROB_NS: 0.00 [range is 0.0-1.0]\nPROB_REMNANT: 0.00 [range is 0.0-1.0]\nPROB_BNS: 0.00 [range is 0.0-1.0]\nPROB_NSBH: 0.00 [range is 0.0-1.0]\nPROB_BBH: 1.00 [range is 0.0-1.0]\nPROB_MassGap: 0.00 [range is 0.0-1.0]\nPROB_TERRES: 0.00 [range is 0.0-1.0]\nTRIGGER_ID: 0x10\nMISC: 0x1898802\nSKYMAP_FITS_URL: https://gracedb.ligo.org/api/superevents/S250701bp/files/bayestar.multiorder.fits,0\nEVENTPAGE_URL: https://gracedb.ligo.org/superevents/S250701bp/view/\nCOMMENTS: LVC Preliminary Trigger Alert. \nCOMMENTS: This event is an OpenAlert. \nCOMMENTS: LIGO-Livingston Observatory contributed to this candidate event. \n \n \n//////////////////////////////////////////////////////////////////////\nTITLE: GCN/LVC NOTICE\nNOTICE_DATE: Tue 01 Jul 25 20:39:44 UT\nNOTICE_TYPE: LVC Preliminary\nTRIGGER_NUM: S250701bp\nTRIGGER_DATE: 20857 TJD; 182 DOY; 2025/07/01 (yyyy/mm/dd)\nTRIGGER_TIME: 74080.856200 SOD {20:34:40.856200} UT\nSEQUENCE_NUM: 2\nGROUP_TYPE: 1 = CBC\nSEARCH_TYPE: 1 = AllSky\nPIPELINE_TYPE: 4 = gstlal\nFAR: 3.133e-17 [Hz] (one per 369476020655.3 days) (one per 1012263070.29 years)\nPROB_NS: 0.00 [range is 0.0-1.0]\nPROB_REMNANT: 0.00 [range is 0.0-1.0]\nPROB_BNS: 0.00 [range is 0.0-1.0]\nPROB_NSBH: 0.00 [range is 0.0-1.0]\nPROB_BBH: 1.00 [range is 0.0-1.0]\nPROB_MassGap: 0.00 [range is 0.0-1.0]\nPROB_TERRES: 0.00 [range is 0.0-1.0]\nTRIGGER_ID: 0x10\nMISC: 0x2898A02\nSKYMAP_FITS_URL: https://gracedb.ligo.org/api/superevents/S250701bp/files/bayestar.multiorder.fits,1\nEVENTPAGE_URL: https://gracedb.ligo.org/superevents/S250701bp/view/\nCOMMENTS: LVC Preliminary Trigger Alert. \nCOMMENTS: This event is an OpenAlert. \nCOMMENTS: LIGO-Livingston Observatory contributed to this candidate event. \n \n \n//////////////////////////////////////////////////////////////////////\nTITLE: GCN/LVC NOTICE\nNOTICE_DATE: Tue 01 Jul 25 20:56:03 UT\nNOTICE_TYPE: LVC Initial Skymap\nTRIGGER_NUM: S250701bp\nTRIGGER_DATE: 20857 TJD; 182 DOY; 2025/07/01 (yyyy/mm/dd)\nTRIGGER_TIME: 74080.856200 SOD {20:34:40.856200} UT\nSEQUENCE_NUM: 3\nGROUP_TYPE: 1 = CBC\nSEARCH_TYPE: 1 = AllSky\nPIPELINE_TYPE: 4 = gstlal\nFAR: 3.133e-17 [Hz] (one per 369476020655.3 days) (one per 1012263070.29 years)\nPROB_NS: 0.00 [range is 0.0-1.0]\nPROB_REMNANT: 0.00 [range is 0.0-1.0]\nPROB_BNS: 0.00 [range is 0.0-1.0]\nPROB_NSBH: 0.00 [range is 0.0-1.0]\nPROB_BBH: 1.00 [range is 0.0-1.0]\nPROB_MassGap: 0.00 [range is 0.0-1.0]\nPROB_TERRES: 0.00 [range is 0.0-1.0]\nTRIGGER_ID: 0x10\nMISC: 0x3898A02\nSKYMAP_FITS_URL: https://gracedb.ligo.org/api/superevents/S250701bp/files/bayestar.multiorder.fits,1\nEVENTPAGE_URL: https://gracedb.ligo.org/superevents/S250701bp/view/\nCOMMENTS: LVC Super Initial Skymap -- a location probability map. \nCOMMENTS: This event is an OpenAlert. \nCOMMENTS: LIGO-Livingston Observatory contributed to this candidate event. \n \n ",
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"title": "S250702k - PRELIMINARY",
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"title": "S250702k - PRELIMINARY",
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{
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"title": "LIGO/Virgo/KAGRA S250702n: Identification of a GW compact binary merger candidate",
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"authors": "Lorenzo Lunghini at University of Napoli <lorenzo.lunghini@na.infn.it>",
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"subject": "LIGO/Virgo/KAGRA S250702n: 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 S250702n during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2025-07-02 13:32:00.382 UTC (GPS time: 1435498338.382). The candidate was found by the cWB BBH [1], GstLAL [2], MBTA [3], and PyCBC Live [4] analysis pipelines.\n\nS250702n is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.7e-08 Hz, or about one in 1 year, 9 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250702n\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 33 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 well fit by an ellipse with an area of 2243 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(04h30m, -39d49m, 37.85d, 19.28d, 56.35d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 2096 +/- 697 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\n [2] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008\n [3] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [4] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a\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 S250702n: Identification of a GW compact binary merger candidate",
"submitter": "Lorenzo Lunghini at University of Napoli <lorenzo.lunghini@na.infn.it>",
"authors": "Lorenzo Lunghini at University of Napoli <lorenzo.lunghini@na.infn.it>",
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"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250702n during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2025-07-02 13:32:00.382 UTC (GPS time: 1435498338.382). The candidate was found by the cWB BBH [1], GstLAL [2], MBTA [3], and PyCBC Live [4] analysis pipelines.\n\nS250702n is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.7e-08 Hz, or about one in 1 year, 9 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250702n\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 33 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 well fit by an ellipse with an area of 2243 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(04h30m, -39d49m, 37.85d, 19.28d, 56.35d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 2096 +/- 697 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\n [2] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008\n [3] Alléné et al. CQG 42, 105009 (2025) doi:10.1088/1361-6382/add234\n [4] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a\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": "S250702ad - PRELIMINARY",
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