July 2026 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 43381] EP260703a: SVOM/ECLAIRs Upper Limit
by GCN Circulars 15 Jul '26

15 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45166 SUBJECT: EP260703a: SVOM/ECLAIRs Upper Limit DATE: 26/07/15 10:13:13 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> H. Yang, O. Godet (IRAP), S. Schanne (CEA) report on behalf of the SVOM team: We performed a targeted search to the X-ray transient EP260703a, detected by EP-WXT at 2026-07-03T03:13:57 UTC (T0) lasting for about 50 s (EP team, GCN 45070), with the SVOM/ECLAIRs event-by-event data downloaded through the X-band ground station. At T0, the transient position was within the ECLAIRs field of view (FoV), although ~90% of the FoV was occulted by the Earth. No statistically significant signal was identified within the T0 +/- 1000 s interval by the ECLAIRs image trigger performed on multiple timescales and energy bands. For the interval from T0 to T0 + 50 s, we derive a 3-sigma upper limit of 2e-8 erg/cm^2/s in the 4-120 keV band assuming a power-law model with a photon index of 0.22 measured by EP-WXT (GCN 45070), or 6e-9 erg/cm^2/s assuming a soft power-law model with a photon index of 2.0. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. ECLAIRs was developed jointly by APC, CEA, CNES, and IRAP. The SVOM/ECLAIRs point of contact for this event is : Hui Yang (hui.yang(a)cnrs.fr) View this GCN Circular online at https://gcn.nasa.gov/circulars/45166. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43380] GRB 260710A: AstroSat CZTI detection
by GCN Circulars 15 Jul '26

15 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45165 SUBJECT: GRB 260710A: AstroSat CZTI detection DATE: 26/07/15 08:57:17 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910(a)gmail.com> A. Arya (IITB), A. Goyal (IITB), S. Salunke(IUCAA), Harsha K. H. (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a short duration GRB 260710A which was also detected by Fermi (Fermi GBM team, GCN Circ. 45131), and Insight-HXMT/HE (Xing-Hao Luo et.al., GCN Circ. 45144). The source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2026-07-10 12:58:43.56 UTC. The measured peak count rate associated with the burst is 331 (+50, -55) counts/s above the background in the combined data of all quadrants, with a total of 426 (+150, -166) counts. The local mean background count rate was 616 (+6, -6) counts/s. Due to the intrinsic 1 s binning of veto data, we cannot reliably estimate a T90 for our detection. The source was also faintly detected in the CZT detectors in the 20-200 keV energy range. CZTI data products like interactive and downloadable light curves for this GRB can be found at:https://astrosat.iucaa.in/cift/cift_products/ET20260710T125843/ET20260710T125843_details.html CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/45165. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43379] GRB 250709A: AstroSat CZTI detection
by GCN Circulars 15 Jul '26

15 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45164 SUBJECT: GRB 250709A: AstroSat CZTI detection DATE: 26/07/15 07:35:09 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910(a)gmail.com> S.Salunke (IUCAA), Harsha K. H. (IUCAA), A. Goyal (IITB), A. Arya (IITB), G. Waratkar (Caltech/IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 250709A which was also detected by Fermi (Fermi GBM team, GCN Circ. 45121), VOM/GRM (SVOM/GRM team, GCN Circ. 45137). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2026-07-09 01:07:50.62 UTC. The measured peak count rate associated with the burst is 108 (+32, -14) counts/s above the background in the combined data of three quadrants (out of four), with a total of 1034 (+278, -266) counts. The local mean background count rate was 207 (+2, -3) counts/s. We measure a T90 of 26 (+10, -8) s from the cumulative CZT light curve. We note that the burst is relatively weak, hence theT90 measurement has a larger uncertainty than usual. CZTI data products like interactive and downloadable light curves for this GRB can be found at:https://astrosat.iucaa.in/cift/cift_products/ET20260709T010732/ET20260709T010732_details.html CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/45164. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43378] GRB 260714B: AstroSat CZTI detection
by GCN Circulars 15 Jul '26

15 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45163 SUBJECT: GRB 260714B: AstroSat CZTI detection DATE: 26/07/15 07:10:34 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910(a)gmail.com> U. Pathak (IITB), A. Arya (IITB), A. Goyal (IITB), Harsha K. H. (IUCAA), S.Salunke(IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 260714B which was also detected by Fermi/GBM (Fermi GBM team, GCN Circ. 45161), and Fermi LAT (Gupta et. al. , GCN Circ. 45162). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2026-07-14 18:23:32.56 UTC. The measured peak count rate associated with the burst is 816 (+51, -54) counts/s above the background in the combined data of all quadrants, with a total of 3549 (+51, -54) counts. The local mean background count rate was 244 (+3, -3) counts/s. We measure a T90 of 10.7 (+0.2, -0.2) s from the cumulative CZT light curve. The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2026-07-14 18:23:29.78 UTC. The measured peak count rate associated with the burst is 1428 (+71, -82) counts/s above the background in the combined data of all quadrants, with a total of 6388 (+194, -285) counts. The local mean background count rate was 1225 (+5, -6) counts/s. We measure a T90 of 10.7 (+0.2, -0.2) s from the cumulative Veto light curve. CZTI data products like interactive and downloadable light curves for this GRB can be found at: https://astrosat.iucaa.in/cift/cift_products/ET20260714T182326/ET20260714T1… CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/45163. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43377] GRB 260714B: Fermi-LAT detection
by GCN Circulars 15 Jul '26

15 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45162 SUBJECT: GRB 260714B: Fermi-LAT detection DATE: 26/07/15 02:59:59 GMT FROM: Rahul Gupta at NASA GSFC <rahul.gupta(a)nasa.gov> R. Gupta (NASA/GSFC), and N. Di Lalla (Stanford University) report on behalf of the Fermi-LAT collaboration: At 18:23:26.76 UT on July 14th, 2026, Fermi-LAT detected high-energy emission from GRB 260714B, which was also detected by Fermi-GBM (trigger 805746211/260714766, GCN #45158). The best LAT on-ground location is found to be RA, Dec = 163.12, 46.98 (J2000) with an error radius of 0.11 deg (90 % containment, statistical error only). This was 57 deg from the LAT boresight at the time of the trigger. The data from the Fermi-LAT show a significant increase in the event rate that is spatially and temporally correlated with the trigger with high significance. The photon flux above 100 MeV in the time interval 0 - 400 s after the GBM trigger is (3.86 ± 0.91)E-5 ph/cm2/s. The estimated photon index above 100 MeV is -2.13 ± 0.23. The highest energy photon has an energy of 10 GeV and occurs at 200 s after trigger time. The Fermi-LAT point of contact for this burst is Frédéric Piron (piron(a)in2p3.fr) The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. View this GCN Circular online at https://gcn.nasa.gov/circulars/45162. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43376] GRB 260714B: Fermi GBM Detection
by GCN Circulars 15 Jul '26

15 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45161 SUBJECT: GRB 260714B: Fermi GBM Detection DATE: 26/07/15 02:59:10 GMT FROM: oindabimukherjee(a)gmail.com O. Mukherjee (USRA) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 18:23:26.76 UT on 14 July 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260714B (trigger 805746211/260714766). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 166.40, Dec = 46.66 (J2000 degrees, equivalent to J2000 11h 5m, +46d 39'), with a statistical uncertainty of 4.01 degrees. (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a mixture of two Gaussians, one with a radius of 1.8 degrees (52% contribution) and one with a radius of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1]). The angle from the Fermi LAT boresight is 56 degrees. The GBM light curve consists of a single emission episode with multiple peaks, with a duration (T90) of about 12.5 s (50-300 keV). The time-averaged spectrum from T0+0.002 to T0+18.435 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.14 +/- 0.01 and the cutoff energy, parameterized as Epeak, is 660 +/- 3 keV. The event fluence (10-1000 keV) in this time interval is (2.51 +/- 0.02)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+5.2 s in the 10-1000 keV band is 17.1 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/" View this GCN Circular online at https://gcn.nasa.gov/circulars/45161. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43375] GRB 260714B: BALROG localization (Fermi Trigger 805746211 / GRB 260714766)
by GCN Circulars 14 Jul '26

14 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45160 SUBJECT: GRB 260714B: BALROG localization (Fermi Trigger 805746211 / GRB 260714766) DATE: 26/07/14 19:00:44 GMT FROM: Jochen Greiner at MPE <jcgrog(a)mpe.mpg.de> T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 805746211 at 18:23:26 on 14 July 2026 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60). The best-fit position is: RA(2000.0) = 163.3 deg Decl.(2000.0) = 47.8 deg The 1 sigma statistical error radius is 1.5 deg. We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB260714766/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB260714766/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB260714766/json View this GCN Circular online at https://gcn.nasa.gov/circulars/45160. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43374] IceCube-260712A: Upper limits from a search for additional neutrino events in IceCube
by GCN Circulars 14 Jul '26

14 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45159 SUBJECT: IceCube-260712A: Upper limits from a search for additional neutrino events in IceCube DATE: 26/07/14 18:58:13 GMT FROM: syan079(a)icecube.wisc.edu The IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-260712A (https://gcn.nasa.gov/circulars/45141) in a time range of 1000 seconds centered on the alert event time (2026-07-12 10:58:28.989 UTC to 2026-07-12 11:15:08.989 UTC) during which IceCube was collecting good quality data. Excluding the event that prompted the alert, zero track-like events are found within the 90% containment region of IceCube-260712A. We report a p-value of 1.00 in this time window. IceCube’s sensitivity to neutrino point sources with an E^-2.5 spectrum, expressed as E^2 dN/dE evaluated at 1 TeV, is 1.5e-01 GeV cm^-2 within the 90% spatial containment region of IceCube-260712A in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.5 spectrum have energies in the approximate energy range between 2e+02 GeV and 5e+04 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2026-07-11 11:06:48.989 UTC to 2026-07-13 11:06:48.989 UTC). In this case, we report a p-value of 1.00, consistent with no significant excess of track events. IceCube’s sensitivity to neutrino point sources with an E^-2.5 spectrum, expressed as E^2 dN/dE evaluated at 1 TeV, is 1.8e-01 GeV cm^-2 within the 90% spatial containment region of IceCube-260712A in a 2 day time window. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc(a)icecube.wisc.edu. [1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021) View this GCN Circular online at https://gcn.nasa.gov/circulars/45159. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43373] GRB 260714B: Fermi GBM Final Real-time Localization
by GCN Circulars 14 Jul '26

14 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45158 SUBJECT: GRB 260714B: Fermi GBM Final Real-time Localization DATE: 26/07/14 18:33:58 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 18:23:26 UT on 14 Jul 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260714B (trigger 805746211.760106 / 260714766). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 166.4, Dec = 46.7 (J2000 degrees, equivalent to J2000 11h 05m, 46d 42'), with a statistical uncertainty of 4.0 degrees. The angle from the Fermi LAT boresight is 56.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260714766/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260714766/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260714766/… View this GCN Circular online at https://gcn.nasa.gov/circulars/45158. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 43372] IceCube-260712A: LAST optical follow-up observations of the IceCube neutrino candidate
by GCN Circulars 14 Jul '26

14 Jul '26

TITLE: GCN CIRCULAR NUMBER: 45157 SUBJECT: IceCube-260712A: LAST optical follow-up observations of the IceCube neutrino candidate DATE: 26/07/14 15:05:38 GMT FROM: Simone Garrappa at Weizmann Institute of Science <simone.garrappa(a)weizmann.ac.il> S. Garrappa (WIS), R. Konno (WIS), E. A. Zimmerman (WIS), A. Horowicz (WIS), E. O. Ofek (WIS), S. Ben-Ami (WIS), D. Polishook (WIS), O. Yaron (WIS), S. Fainer (WIS), A. Krassilchtchikov (WIS), Y. M. Shani (WIS), E. Segre (WIS), A. Gal-Yam (WIS), and S. Spitzer (WIS) on behalf of the LAST Collaboration. We report observations of the IceCube Bronze neutrino candidate IC-260712A (GCN#45141) with the Large Array Survey Telescope (LAST, Ofek et al. 2023; Ben-Ami et al. 2023). We observed the field of IC-260712A using four telescopes (one unit), each with a FoV of 7.4 sq. deg and no filter (clear - similar to the GAIA Bp band) over several epochs. In each epoch, we stack 20 x 20 s images. We began observations on 13 07 2026 at 18:54:08 UTC (T-T0 = 31.8 hours). The observations covered the full 90% neutrino footprint reported in GCN#45141 with a single LAST telescope. We find no candidate transient optical counterpart in the automatic transient-detection pipeline (Konno et al. 2026). For each epoch, the average 5-sigma limiting magnitude in the neutrino footprint, is 20.1 (AB). LAST is a survey telescope array of the Weizmann Astrophysical Observatory (https://www.weizmann.ac.il/wao/) View this GCN Circular online at https://gcn.nasa.gov/circulars/45157. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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