vsnet-grb-info

Download

vsnet-grb-info@ooruri.kusastro.kyoto-u.ac.jp

December 2025

1 participants
392 discussions

[vsnet-grb-info 40984] Fermi GRB 251130B: Global MASTER-Net observations report
by GCN Circulars 01 Dec '25

01 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42912 SUBJECT: Fermi GRB 251130B: Global MASTER-Net observations report DATE: 25/12/01 02:15:34 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-Kislovodsk robotic telescope [1] located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 251130B ( Fermi GBM team, GCN 42905) errorbox 31683 sec after notice time and 31712 sec after trigger time at 2025-12-01 00:21:50 UT, with upper limit up to 16.3 mag. The observations began at zenith distance = 79 deg. The sun altitude is -43.2 deg. The galactic latitude b = -19 deg., longitude l = 255 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3056013 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 31742 | 2025-12-01 00:21:50 | MASTER-Kislovodsk | (06h 49m 44.31s , -34d 43m 17.4s) | C | 60 | 16.3 | 31742 | 2025-12-01 00:21:50 | MASTER-Kislovodsk | (06h 44m 55.88s , -34d 22m 49.2s) | C | 60 | 15.0 | 31822 | 2025-12-01 00:23:10 | MASTER-Kislovodsk | (07h 04m 25.10s , -34d 44m 07.1s) | C | 60 | 15.9 | 31822 | 2025-12-01 00:23:10 | MASTER-Kislovodsk | (06h 59m 36.92s , -34d 23m 35.3s) | C | 60 | 14.8 | 31902 | 2025-12-01 00:24:29 | MASTER-Kislovodsk | (06h 40m 40.37s , -32d 51m 33.0s) | C | 60 | 16.1 | 31902 | 2025-12-01 00:24:29 | MASTER-Kislovodsk | (06h 35m 57.97s , -32d 31m 06.6s) | C | 60 | 14.6 | 31982 | 2025-12-01 00:25:49 | MASTER-Kislovodsk | (07h 19m 00.02s , -34d 44m 45.6s) | C | 60 | 14.7 | 31982 | 2025-12-01 00:25:49 | MASTER-Kislovodsk | (07h 14m 12.41s , -34d 24m 10.5s) | C | 60 | 13.7 | 32061 | 2025-12-01 00:27:09 | MASTER-Kislovodsk | (06h 54m 58.67s , -32d 49m 48.0s) | C | 60 | 16.3 | 32061 | 2025-12-01 00:27:09 | MASTER-Kislovodsk | (06h 50m 16.82s , -32d 29m 18.5s) | C | 60 | 15.0 | 32141 | 2025-12-01 00:28:29 | MASTER-Kislovodsk | (07h 09m 15.84s , -32d 50m 53.6s) | C | 60 | 15.8 | 32141 | 2025-12-01 00:28:29 | MASTER-Kislovodsk | (07h 04m 33.40s , -32d 30m 27.1s) | C | 60 | 14.2 | 32221 | 2025-12-01 00:29:49 | MASTER-Kislovodsk | (07h 28m 45.67s , -34d 22m 42.6s) | C | 60 | 13.4 | 32381 | 2025-12-01 00:32:28 | MASTER-Kislovodsk | (06h 26m 31.94s , -32d 51m 09.2s) | C | 60 | 15.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/42912. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

[vsnet-grb-info 40983] GRB 251127A: SVOM/GRM observation
by GCN Circulars 01 Dec '25

01 Dec '25

TITLE: GCN CIRCULAR NUMBER: 42911 SUBJECT: GRB 251127A: SVOM/GRM observation DATE: 25/12/01 02:08:58 GMT FROM: Chenwei Wang at IHEP <cwwang(a)ihep.ac.cn> SVOM/GRM team: Chen-Wei Wang, Zheng-Hang Yu, Yue Huang, Shi-Jie Zheng, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Jean-Luc Atteia (IRAP) Report on behalf of the SVOM team: SVOM/GRM was triggered in-flight by a burst GRB 251127A at 2025-11-27T03:17:44.000 UTC (T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #42852) and Glowbug (C.C. Cheung et al., GCN #42872). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of mutiple peaks with a T90 of 17.5 +4.0/-2.5 s in the 15-5000 keV band. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb251127A.png In addition, the position of this burst, as determined by Fermi/GBM (RA= 155.6, DEC= 30.2, GCN#42852), is located at about 46 degrees from the SVOM optical axis, which is outside the ECLAIRs field of view. With this localization, the time-averaged spectrum from T0-2 to T0+18 s is best fitted by a power law function with an exponential high-energy cutoff. The power law index is -1.09 +0.22/-0.21 and the cutoff energy, parameterized as Epeak, is 267 +251/-77 keV. The event fluence (10-1000 keV) in this time interval is (1.05 +0.11/-0.11)E-05 erg/cm^2. The 1s peak spectrum, measured from T0-1 to T0 s, if fitted by a power law function with an exponential high-energy cutoff, the power law index is -1.01 +0.18/-0.16 and the cutoff energy, parameterized as Epeak, is 591 +503/-197 keV. The flux (10-1000 keV) in this time interval is (7.84 +0.88/-1.01)E-07 erg/cm^2/s. The localization of GRB 251127A in the 'Amati' relation diagram is shown at: https://www.bursthub.cn//admin/static/svgrb251127A_amati.png The localization of GRB 251127A in the 'Yonetoku' relation diagram is shown at: https://www.bursthub.cn//admin/static/svgrb251127A_yonetoku.png The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM point of contact for this burst is: Chen-Wei Wang (IHEP)(cwwang(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/42911. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

1 0

Jump to page: