July 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 38950] Fermi GRB 250702B: Global MASTER-Net observations report
by GCN Circulars 03 Jul '25

03 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40904 SUBJECT: Fermi GRB 250702B: Global MASTER-Net observations report DATE: 25/07/03 02:15:23 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 250702B ( Fermi GBM team, GCN 40883) errorbox 36852 sec after notice time and 36888 sec after trigger time at 2025-07-03 00:10:54 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 28 deg. The sun altitude is -68.5 deg. The galactic latitude b = -7 deg., longitude l = 27 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2923151 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 36919 | 2025-07-03 00:10:54 | MASTER-SAAO | (18h 58m 11.78s , -10d 24m 39.1s) | C | 60 | 18.2 | 37016 | 2025-07-03 00:12:31 | MASTER-SAAO | (19h 06m 18.96s , -10d 26m 55.8s) | C | 60 | 18.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/40904. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38949] GRB 250702D, C, E: Swift/BAT-GUANO localization skymap of a burst or galactic transient
by GCN Circulars 03 Jul '25

03 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40903 SUBJECT: GRB 250702D, C, E: Swift/BAT-GUANO localization skymap of a burst or galactic transient DATE: 25/07/03 01:29:21 GMT FROM: Jimmy DeLaunay at Penn State <delauj2(a)gmail.com> James DeLaunay (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (Caltech), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC), Maia Williams (PSU) report: Fermi/GBM triggered on four possible GRBs with similar localizations (GCN 40891) that may all have a common origin. Three of these bursts (GRB 250702D GCN 40886, GRB 250702C GCN 40885, GRB 250702E GCN 40890) have been detected in Swift/BAT-GUANO data. GRB 250702D (T0: 2025-07-02T13:09:02.03 UTC, Fermi/GBM trig 773154547) was detected by the NITRATES analysis (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169) with a sqrt(TS) of 14.6 in a 8.192 s analysis time bin, starting at T0 - 6.144 s. The localization resulted in a 90% credible area of 5,318 deg2, a 50% credible area of 1,192 deg2, and an integrated probability of 5% inside the coded field of view. GRB 250702C (T0: 2025-07-02T14:49:31.91 UTC, Fermi/GBM trig 773160576) was detected by the NITRATES analysis with a sqrt(TS) of 7.5 in a 16.384 s analysis time bin, starting at T0 - 4.096 s. The localization resulted in a 90% credible area of 13,685 deg2, a 50% credible area of 4,087 deg2, and an integrated probability of 7% inside the coded field of view. GRB 250702E (T0: 2025-07-02T16:21:33.07 UTC, Fermi/GBM trig 773166098) was detected by the NITRATES analysis with a sqrt(TS) of 12.3 in a 8.192 s analysis time bin, starting at T0 - 4.096 s. The localization resulted in a 90% credible area of 8,604 deg2, a 50% credible area of 2,099 deg2, and an integrated probability of 3% inside the coded field of view. The localizations of all three bursts are consistent with the combined GBM skymap (GCN 40891). When the three NITRATES localizations are combined with the combined GBM skymap there is a slight improvement, with a 90% credible region of 142 deg2 centered at, RA, Dec = 285.820, -4.182 deg More details about these bursts and their skymaps can be found here: GRB 250702D https://guano.swift.psu.edu/trigger_report?id=773154577 GRB 250702C https://guano.swift.psu.edu/trigger_report?id=773160607 GRB 250702E https://guano.swift.psu.edu/trigger_report?id=773166128 The combined NITRATES and Fermi GBM skymap localization can be found here: https://zenodo.org/records/15795079 Additionally, imaging was performed to search for persistent emission while the source was in the coded field of view from ~13:28 to 13:48 UTC and from ~17:50 to 18:06 UTC, but nothing significant was found. GUANO 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. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/ View this GCN Circular online at https://gcn.nasa.gov/circulars/40903. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38948] GRB 250702F: Enhanced Swift-XRT position
by GCN Circulars 03 Jul '25

03 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40902 SUBJECT: GRB 250702F: Enhanced Swift-XRT position DATE: 25/07/03 00:08:06 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 2088 s of XRT Photon Counting mode data and 2 UVOT images for GRB 250702F, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 212.93584, +16.74909 which is equivalent to: RA (J2000): 14h 11m 44.60s Dec (J2000): +16d 44' 56.7" with an uncertainty of 2.2 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/40902. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38947] GRB 250702F: GTC/OSIRIS+ spectroscopic redshift z = 1.520
by GCN Circulars 02 Jul '25

02 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40901 SUBJECT: GRB 250702F: GTC/OSIRIS+ spectroscopic redshift z = 1.520 DATE: 25/07/02 23:48:29 GMT FROM: Daniele Bjørn Malesani at Cosmic Dawn Center, Niels Bohr Institute <daniele.malesani(a)nbi.ku.dk> A. de Ugarte Postigo (LAM), A. Martin-Carrillo (UCD), D. B. Malesani (DAWN/NBI and Radboud), G. Lombardi (GTC), J. F. Agui Fernandez (CAHA), M. A. Aloy (UV), J. P. U. Fynbo (DAWN/NBI), L. Galbany (IEEC-CSIC), S. Geier (GTC), L. Izzo (INAF/OACN and DARK/NBI), N. A. Rakotondrainibe (LAM), B. Schneider (LAM), N. R. Tanvir (Univ. Leicester), C. C. Thoene (AbAO), F. Pérez (GTC), D. l. Pérez Valladares (GTC) and A. Tejero Caro (GTC) report: We observed the optical afterglow of GRB 250702F detected by Swift (Klingler et al., GCN 40894) and Fermi (Fermi GBM team, GCN 40892), using the 10.4 m GTC located at the Roque de los Muchachos Observatory in the island of La Palma (Spain) equipped with the OSIRIS+ instrument. Our spectroscopic observations started on 2025-07-02 at 22:36:29 UT (1.496 hr after the Swift trigger) and consisted of 2x420 s exposures using grism R1000B, which covers the wavelength range between 3600 and 7700 AA. On top of the bright continuum, a number of clear absorption features are detected. Among many, we identify C IV, Al II, Al III, Fe II, Mg II, Mg I, all at a common redshift z = 1.520. This is likely the redshift of GRB 250702F. View this GCN Circular online at https://gcn.nasa.gov/circulars/40901. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38946] GRB 250702F: NOT observations of the optical afterglow
by GCN Circulars 02 Jul '25

02 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40900 SUBJECT: GRB 250702F: NOT observations of the optical afterglow DATE: 25/07/02 23:14:56 GMT FROM: Antonio Martin-Carrillo at UCD,Space Science Group <antonio.martin-carrillo(a)ucd.ie> A. Martin-Carrillo (UCD), D. B. Malesani (DAWN/NBI and Radboud), G. Corcoran (UCD), B. P. Gompertz (Birmingham), A. de Ugarte Postigo (LAM), A. K. Haris-Kiss (Helsinki Univ.), N. Routamo (Helsinki Univ.), A. A. Djupvik (NOT) report on behalf of a larger collaboration: We observed the field of GRB 250702F detected by Swift (Klingler et al., GCN 40894) and Fermi (Fermi GBM team, GCN 40892), using the StanCam camera mounted on the Nordic Optical Telescope (NOT). We obtained 3x90 s exposures in each of the Bessel-R and SDSS g and i bands, starting at 22:24 UT on 2025-07-02 (77 min after the Swift trigger). The optical afterglow reported by Swift/UVOT (Klingler et al., GCN 40894), Ondrejov D50 (Jelinek et al., GCN 40895), GOTO (Kumar et al., GCN 40896) and MASTER (Lipunov et al., GCN 40899) is well detected in all bands. We measure the following coordinates (J2000, calibrated against Gaia stars): RA = 14:11:44.65 Dec = +16:44:54.7 The object had a magnitude r = 17.99 +/- 0.08 (AB). The photometric calibration was performed using nearby stars from the Pan-STARRS catalog and the magnitude is not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/40900. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38945] GRB 250702F: MASTER optical afterglow observation
by GCN Circulars 02 Jul '25

02 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40899 SUBJECT: GRB 250702F: MASTER optical afterglow observation DATE: 25/07/02 22:49:02 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov (Lomonosov MSU), D.Buckley (SAAO), A.Kuznetsov, E.Gorbovskoy, G.Antipov, P.Balanutsa, A.Chasovnikov, N.Tiurina, V.Topolev, K.Zhirkov, Ya.Kechin, V.Senik, D.Vlasenko (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (OAFA), A.Sosnovskij (Crao RAS), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory MASTER-SAAO robotic telescope (MASTER Global Robotic Net http://observ.pereplet.ru, Lipunov et al. 2010, Advances in Astronomy, v.2010, 30L) located in South African Astronomical Observatory, pointed (Lipunov et al. GCN 40893) to Fermi (GCN 40892) and Swift GRB 250702F (Klingler et al., GCN 40894, Ttrigger=21:06:43.27UT) in two polarization filters at 2025-07-02 21:24:39 UT ( https://master.sai.msu.ru/site/master2/observ.php?id=2923573 ). There is MASTER OT J141144.70+164454.6 with m_OT~16.2 with preliminary significant polarization. This GRB 250702F counterpartwas discovered by Swift (GCN 40894) and also reported by Ondrejov D50 (Jelinek et al., GCN 20895) and GOTO (Kumar et al. GCN 40896) observatories. Observation and reduction will be continued. View this GCN Circular online at https://gcn.nasa.gov/circulars/40899. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38944] Fermi GRB 250702F: Global MASTER-Net observations report
by GCN Circulars 02 Jul '25

02 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40898 SUBJECT: Fermi GRB 250702F: Global MASTER-Net observations report DATE: 25/07/02 22:15:54 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 250702F ( Fermi GBM team, GCN 40892) errorbox 1045 sec after notice time and 1076 sec after trigger time at 2025-07-02 21:24:39 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 68 deg. The sun altitude is -70.5 deg. The galactic latitude b = 66 deg., longitude l = 12 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2923618 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1106 | 2025-07-02 21:24:39 | MASTER-SAAO | (14h 11m 15.13s , +16d 44m 54.1s) | P/ | 60 | 16.2 | 1106 | 2025-07-02 21:24:39 | MASTER-SAAO | (14h 09m 27.09s , +17d 00m 11.2s) | P\\ | 60 | 16.2 | 1185 | 2025-07-02 21:25:58 | MASTER-SAAO | (14h 11m 15.31s , +16d 44m 57.8s) | P/ | 60 | 16.8 | 1185 | 2025-07-02 21:25:58 | MASTER-SAAO | (14h 09m 27.34s , +17d 00m 16.0s) | P\\ | 60 | 16.7 | 1265 | 2025-07-02 21:27:17 | MASTER-SAAO | (14h 11m 15.50s , +16d 45m 01.2s) | P/ | 60 | 16.9 | 1265 | 2025-07-02 21:27:17 | MASTER-SAAO | (14h 09m 27.59s , +17d 00m 19.8s) | P\\ | 60 | 16.8 | 1344 | 2025-07-02 21:28:36 | MASTER-SAAO | (14h 11m 15.81s , +16d 45m 05.4s) | P/ | 60 | 13.8 | 1344 | 2025-07-02 21:28:36 | MASTER-SAAO | (14h 09m 27.96s , +17d 00m 24.8s) | P\\ | 60 | 13.2 | 1423 | 2025-07-02 21:29:55 | MASTER-SAAO | (14h 11m 16.13s , +16d 45m 08.4s) | P/ | 60 | 15.0 | 1423 | 2025-07-02 21:29:55 | MASTER-SAAO | (14h 09m 28.25s , +17d 00m 28.2s) | P\\ | 60 | 15.3 | 1502 | 2025-07-02 21:31:14 | MASTER-SAAO | (14h 11m 16.47s , +16d 45m 11.2s) | P/ | 60 | 17.0 | 1502 | 2025-07-02 21:31:14 | MASTER-SAAO | (14h 09m 28.60s , +17d 00m 32.0s) | P\\ | 60 | 17.0 | 1581 | 2025-07-02 21:32:33 | MASTER-SAAO | (14h 09m 28.93s , +17d 00m 35.2s) | P\\ | 60 | 15.3 | 1581 | 2025-07-02 21:32:33 | MASTER-SAAO | (14h 11m 16.74s , +16d 45m 14.1s) | P/ | 60 | 15.2 | 1660 | 2025-07-02 21:33:53 | MASTER-SAAO | (14h 11m 17.19s , +16d 45m 17.6s) | P/ | 60 | 16.2 | 1660 | 2025-07-02 21:33:53 | MASTER-SAAO | (14h 09m 29.37s , +17d 00m 38.9s) | P\\ | 60 | 16.4 | 1739 | 2025-07-02 21:35:12 | MASTER-SAAO | (14h 09m 29.75s , +17d 00m 41.8s) | P\\ | 60 | 16.2 | 1739 | 2025-07-02 21:35:12 | MASTER-SAAO | (14h 11m 17.59s , +16d 45m 20.3s) | P/ | 60 | 16.2 | 1818 | 2025-07-02 21:36:31 | MASTER-SAAO | (14h 11m 18.09s , +16d 45m 23.6s) | P/ | 60 | 15.3 | 1818 | 2025-07-02 21:36:31 | MASTER-SAAO | (14h 09m 30.27s , +17d 00m 45.5s) | P\\ | 60 | 15.5 | 1897 | 2025-07-02 21:37:50 | MASTER-SAAO | (14h 11m 18.42s , +16d 45m 25.8s) | P/ | 60 | 15.4 | 1897 | 2025-07-02 21:37:50 | MASTER-SAAO | (14h 09m 30.60s , +17d 00m 47.9s) | P\\ | 60 | 14.9 | 1977 | 2025-07-02 21:39:09 | MASTER-SAAO | (14h 11m 18.98s , +16d 45m 28.9s) | P/ | 60 | 14.7 | 1977 | 2025-07-02 21:39:09 | MASTER-SAAO | (14h 09m 31.18s , +17d 00m 51.7s) | P\\ | 60 | 14.9 | 2056 | 2025-07-02 21:40:28 | MASTER-SAAO | (14h 11m 19.57s , +16d 45m 31.9s) | P/ | 60 | 15.2 | 2056 | 2025-07-02 21:40:28 | MASTER-SAAO | (14h 09m 31.82s , +17d 00m 54.9s) | P\\ | 60 | 15.1 | 2135 | 2025-07-02 21:41:47 | MASTER-SAAO | (14h 11m 20.15s , +16d 45m 34.6s) | P/ | 60 | 16.4 | 2135 | 2025-07-02 21:41:47 | MASTER-SAAO | (14h 09m 32.32s , +17d 00m 58.0s) | P\\ | 60 | 16.2 | 2214 | 2025-07-02 21:43:07 | MASTER-SAAO | (14h 11m 20.70s , +16d 45m 37.3s) | P/ | 60 | 15.3 | 2214 | 2025-07-02 21:43:07 | MASTER-SAAO | (14h 09m 32.93s , +17d 01m 00.9s) | P\\ | 60 | 15.5 | 2293 | 2025-07-02 21:44:26 | MASTER-SAAO | (14h 09m 33.46s , +17d 01m 03.5s) | P\\ | 60 | 16.5 | 2293 | 2025-07-02 21:44:26 | MASTER-SAAO | (14h 11m 21.30s , +16d 45m 40.0s) | P/ | 60 | 16.4 | 2372 | 2025-07-02 21:45:45 | MASTER-SAAO | (14h 11m 21.94s , +16d 45m 43.1s) | P/ | 60 | 16.2 | 2372 | 2025-07-02 21:45:45 | MASTER-SAAO | (14h 09m 34.12s , +17d 01m 07.1s) | P\\ | 60 | 16.5 | 2452 | 2025-07-02 21:47:04 | MASTER-SAAO | (14h 11m 22.55s , +16d 45m 45.7s) | P/ | 60 | 16.1 | 2452 | 2025-07-02 21:47:04 | MASTER-SAAO | (14h 09m 34.75s , +17d 01m 09.9s) | P\\ | 60 | 15.6 | 2531 | 2025-07-02 21:48:23 | MASTER-SAAO | (14h 11m 23.17s , +16d 45m 48.6s) | P/ | 60 | 14.8 | 2531 | 2025-07-02 21:48:23 | MASTER-SAAO | (14h 09m 35.46s , +17d 01m 13.1s) | P\\ | 60 | 14.8 | 2610 | 2025-07-02 21:49:42 | MASTER-SAAO | (14h 09m 36.55s , +17d 01m 14.5s) | P\\ | 60 | 16.8 | 2610 | 2025-07-02 21:49:42 | MASTER-SAAO | (14h 11m 23.57s , +16d 45m 50.8s) | P/ | 60 | 17.1 | 2689 | 2025-07-02 21:51:02 | MASTER-SAAO | (14h 11m 24.20s , +16d 45m 53.3s) | C | 60 | 17.4 | 2689 | 2025-07-02 21:51:02 | MASTER-SAAO | (14h 09m 37.19s , +17d 01m 17.3s) | C | 60 | 17.0 | 2768 | 2025-07-02 21:52:21 | MASTER-SAAO | (14h 09m 37.95s , +17d 01m 20.6s) | C | 60 | 16.9 | 2768 | 2025-07-02 21:52:21 | MASTER-SAAO | (14h 11m 24.97s , +16d 45m 56.2s) | C | 60 | 17.6 | 2847 | 2025-07-02 21:53:40 | MASTER-SAAO | (14h 11m 25.79s , +16d 45m 59.0s) | C | 60 | 17.6 | 2847 | 2025-07-02 21:53:40 | MASTER-SAAO | (14h 09m 38.78s , +17d 01m 23.7s) | C | 60 | 17.0 | 2926 | 2025-07-02 21:54:58 | MASTER-SAAO | (14h 11m 26.61s , +16d 46m 02.5s) | C | 60 | 16.4 | 2926 | 2025-07-02 21:54:58 | MASTER-SAAO | (14h 09m 39.68s , +17d 01m 27.7s) | C | 60 | 15.7 | 3005 | 2025-07-02 21:56:18 | MASTER-SAAO | (14h 11m 27.41s , +16d 46m 05.2s) | C | 60 | 17.1 | 3005 | 2025-07-02 21:56:18 | MASTER-SAAO | (14h 09m 40.45s , +17d 01m 30.5s) | C | 60 | 16.4 | 3242 | 2025-07-02 22:00:15 | MASTER-SAAO | (14h 09m 43.34s , +17d 01m 40.5s) | C | 60 | 15.6 | 3242 | 2025-07-02 22:00:15 | MASTER-SAAO | (14h 11m 30.25s , +16d 46m 14.4s) | C | 60 | 16.4 | 3321 | 2025-07-02 22:01:33 | MASTER-SAAO | (14h 11m 30.94s , +16d 46m 16.3s) | C | 60 | 16.8 | 3321 | 2025-07-02 22:01:33 | MASTER-SAAO | (14h 09m 44.09s , +17d 01m 43.0s) | C | 60 | 15.8 | 3400 | 2025-07-02 22:02:52 | MASTER-SAAO | (14h 09m 44.99s , +17d 01m 45.7s) | C | 60 | 15.7 | 3400 | 2025-07-02 22:02:52 | MASTER-SAAO | (14h 11m 31.94s , +16d 46m 18.9s) | C | 60 | 16.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/40898. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38943] Fermi GRB 250702C: Global MASTER-Net observations report
by GCN Circulars 02 Jul '25

02 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40897 SUBJECT: Fermi GRB 250702C: Global MASTER-Net observations report DATE: 25/07/02 22:15:26 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 250702C ( Fermi GBM team, GCN 40885) errorbox 23400 sec after notice time and 23443 sec after trigger time at 2025-07-02 21:20:15 UT, with upper limit up to 18.3 mag. The observations began at zenith distance = 34 deg. The sun altitude is -69.7 deg. The galactic latitude b = 11 deg., longitude l = 29 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2923228 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 940 | 2025-07-02 15:04:42 | MASTER- | (18h 24m 35.12s , +11d 59m 59.4s) | C | 60 | 17.4 | Coadd 23474 | 2025-07-02 21:20:15 | MASTER-SAAO | (17h 52m 31.98s , +01d 13m 24.2s) | C | 60 | 18.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/40897. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38942] GRB 250702F: GOTO optical counterpart detection
by GCN Circulars 02 Jul '25

02 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40896 SUBJECT: GRB 250702F: GOTO optical counterpart detection DATE: 25/07/02 22:04:31 GMT FROM: Amit Kumar at Royal Holloway - UoL/ U of Warwick, UK <amitkundu515(a)gmail.com> A. Kumar, D. O’Neill, B. P. Gompertz, R. Starling, K. Ackley, M. J. Dyer, J. Lyman, K. Ulaczyk, B. Godson, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, and J. Casares report on behalf of the GOTO collaboration: We report on optical observations with the Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022; Dyer et al. 2024) in response to the Swift/BAT and Fermi/GBM detected GRB 250702F (Klingler et al., GCN 40894; Fermi GBM Team, GCN 40892). Targeted observations were performed by GOTO-North at 2025-07-02 21:33:58 (27.25 minutes post-trigger). The observation consisted of 4x90s exposures in the GOTO L-band (400-700 nm). Images were processed immediately after acquisition using the GOTO pipeline. We detect the optical afterglow reported by Swift/UVOT (Klingler et al., GCN 40894) and Ondrejov D50 (Jelinek et al., GCN 40895) with an L-band magnitude of 17.12 ± 0.07 (AB). Magnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction. Observations are ongoing. GOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC). View this GCN Circular online at https://gcn.nasa.gov/circulars/40896. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38941] GRB 250702F: Ondrejov D50 optical afterglow detection
by GCN Circulars 02 Jul '25

02 Jul '25

TITLE: GCN CIRCULAR NUMBER: 40895 SUBJECT: GRB 250702F: Ondrejov D50 optical afterglow detection DATE: 25/07/02 21:46:43 GMT FROM: Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek(a)asu.cas.cz> M. Jelinek, F. Novotny, A. Malenakova, J. Strobl, R. Hudec, C. Polasek (ASU CAS Ondrejov) report:We are observing the position of the Swift-detected GRB 250702F (trigger #1329888, very likely identical to Fermi GBM trigger #773183208) with the D50 robotic telescope of the Astronomical Institute Ondrejov, near Prague, Czech Republic. We initially performed a series of 20s unfiltered exposures starting 27.8s after the Swift trigger. We clearly detect a possible optical afterglow in single 20s images at 14:11:44.6s +16:44:55 (J2000, 212.935979, +16.748483). The forward shock component peaked at unfiltered magnitude ~15.1 approximately 4 minutes post-GRB and shows a slow decay during our ongoing observations. Further observations and detailed photometry are in progress. View this GCN Circular online at https://gcn.nasa.gov/circulars/40895. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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