GCN Circular 42565

Subject
Fermi GRB 251103A: Global MASTER-Net observations report
Event
GRB 251103A
Date
2025-11-03T23:31:13Z (3 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
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-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 251103A ( Fermi GBM team, GCN 42536Loading...
 
 ) errorbox  63596 sec after notice time and 63634 sec after trigger time at 2025-11-03 22:27:02 UT, with upper limit up to  17.2 mag. The observations began at zenith distance = 77 deg. The sun  altitude  is -58.5 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 251103A errorbox  65141 sec after notice time and 65180 sec after trigger time at 2025-11-03 22:52:48 UT, with upper limit up to  16.8 mag. The observations began at zenith distance = 70 deg. The sun  altitude  is -52.4 deg. 

The galactic latitude b = 48 deg., longitude l = 216 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3030951

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   63665 | 2025-11-03 22:27:02 |      MASTER-Tavrida | (09h 39m 04.69s , +19d 28m 36.2s) |   C |    60 | 15.8 |        
   63743 | 2025-11-03 22:28:21 |      MASTER-Tavrida | (09h 45m 39.49s , +18d 09m 40.8s) |   C |    60 | 15.6 |        
   63812 | 2025-11-03 22:29:30 |      MASTER-Tavrida | (09h 50m 09.05s , +19d 26m 40.9s) |   C |    60 | 15.9 |        
   63890 | 2025-11-03 22:30:48 |      MASTER-Tavrida | (09h 43m 57.72s , +20d 45m 36.4s) |   C |    60 | 15.8 |        
   63957 | 2025-11-03 22:31:54 |      MASTER-Tavrida | (09h 34m 46.40s , +18d 09m 53.8s) |   C |    60 | 14.9 |        
   64037 | 2025-11-03 22:33:15 |      MASTER-Tavrida | (09h 47m 09.24s , +16d 23m 55.5s) |   C |    60 | 15.6 |        
   64112 | 2025-11-03 22:34:29 |      MASTER-Tavrida | (09h 41m 40.15s , +16d 50m 37.4s) |   C |    60 | 15.8 |        
   64187 | 2025-11-03 22:35:45 |      MASTER-Tavrida | (09h 54m 59.68s , +20d 46m 42.7s) |   C |    60 | 15.6 |        
   64264 | 2025-11-03 22:37:02 |      MASTER-Tavrida | (09h 49m 01.38s , +22d 03m 37.6s) |   C |    60 | 16.1 |        
   64429 | 2025-11-03 22:39:47 |      MASTER-Tavrida | (09h 37m 53.16s , +15d 32m 17.9s) |   C |    60 | 16.0 |        
   64597 | 2025-11-03 22:42:34 |      MASTER-Tavrida | (09h 52m 28.41s , +16d 52m 15.0s) |   C |    60 | 16.0 |        
   64665 | 2025-11-03 22:43:42 |      MASTER-Tavrida | (09h 56m 36.54s , +18d 09m 42.0s) |   C |    60 | 15.9 |        
   64740 | 2025-11-03 22:44:58 |      MASTER-Tavrida | (09h 48m 39.02s , +15d 32m 54.2s) |   C |    60 | 15.9 |        
   64817 | 2025-11-03 22:46:15 |      MASTER-Tavrida | (10h 01m 15.68s , +19d 27m 16.3s) |   C |    60 | 15.9 |        
   64896 | 2025-11-03 22:47:34 |      MASTER-Tavrida | (09h 32m 51.01s , +20d 44m 10.5s) |   C |    60 | 15.9 |        
   65080 | 2025-11-03 22:50:38 |      MASTER-Tavrida | (09h 30m 39.62s , +16d 50m 15.8s) |   C |    60 | 16.2 |        
   65210 | 2025-11-03 22:52:48 |   MASTER-Kislovodsk | (09h 45m 41.10s , +15d 52m 44.3s) |   C |    60 | 15.3 |        
   65210 | 2025-11-03 22:52:48 |   MASTER-Kislovodsk | (09h 45m 37.84s , +16d 14m 48.4s) |   C |    60 | 15.3 |        
   65252 | 2025-11-03 22:53:30 |      MASTER-Tavrida | (09h 28m 08.59s , +19d 27m 24.4s) |   C |    60 | 16.0 |        
   65290 | 2025-11-03 22:54:08 |   MASTER-Kislovodsk | (09h 45m 42.17s , +15d 53m 49.3s) |   C |    60 | 15.3 |        
   65290 | 2025-11-03 22:54:08 |   MASTER-Kislovodsk | (09h 45m 38.78s , +16d 15m 52.2s) |   C |    60 | 15.2 |        
   65329 | 2025-11-03 22:54:47 |      MASTER-Tavrida | (10h 03m 23.21s , +16d 50m 53.3s) |   C |    60 | 16.0 |        
   65370 | 2025-11-03 22:55:27 |   MASTER-Kislovodsk | (09h 45m 44.69s , +16d 14m 55.7s) |   C |    60 | 14.4 |        
   65407 | 2025-11-03 22:56:04 |      MASTER-Tavrida | (09h 59m 28.09s , +15d 33m 03.1s) |   C |    60 | 16.1 |        
   65450 | 2025-11-03 22:56:47 |   MASTER-Kislovodsk | (09h 45m 37.64s , +16d 14m 01.1s) |   C |    60 | 13.0 |        
   65492 | 2025-11-03 22:57:30 |      MASTER-Tavrida | (09h 45m 09.73s , +14d 16m 08.9s) |   C |    60 | 16.0 |        
   65572 | 2025-11-03 22:58:49 |      MASTER-Tavrida | (09h 43m 15.43s , +23d 20m 25.8s) |   C |    60 | 15.9 |        
   65652 | 2025-11-03 23:00:09 |      MASTER-Tavrida | (09h 23m 45.21s , +18d 09m 40.8s) |   C |    60 | 16.3 |        
   65719 | 2025-11-03 23:00:47 |   MASTER-Kislovodsk | (09h 45m 40.53s , +16d 14m 40.7s) |   C |   120 | 12.0 |        
   65732 | 2025-11-03 23:01:29 |      MASTER-Tavrida | (09h 55m 49.49s , +14d 15m 39.6s) |   C |    60 | 16.1 |        
   65813 | 2025-11-03 23:02:51 |      MASTER-Tavrida | (10h 07m 38.94s , +18d 09m 58.4s) |   C |    60 | 15.8 |        
   65859 | 2025-11-03 23:03:06 |   MASTER-Kislovodsk | (09h 45m 43.46s , +16d 16m 15.9s) |   C |   120 | 13.2 |        
   65998 | 2025-11-03 23:05:26 |   MASTER-Kislovodsk | (09h 45m 42.35s , +15d 53m 35.0s) |   C |   120 | 13.1 |        
   65998 | 2025-11-03 23:05:26 |   MASTER-Kislovodsk | (09h 45m 38.38s , +16d 15m 33.9s) |   C |   120 | 13.8 |        
   66058 | 2025-11-03 23:05:26 |   MASTER-Kislovodsk | (09h 45m 38.38s , +16d 15m 33.9s) |   C |   240 | 14.9 |  Coadd 
   65983 | 2025-11-03 23:05:41 |      MASTER-Tavrida | (10h 00m 15.07s , +22d 04m 18.9s) |   C |    60 | 15.7 |        
   66063 | 2025-11-03 23:07:01 |      MASTER-Tavrida | (09h 34m 27.78s , +14d 15m 40.9s) |   C |    60 | 15.2 |        
   66108 | 2025-11-03 23:07:46 |   MASTER-Kislovodsk | (09h 45m 38.40s , +16d 16m 40.2s) |   C |    60 | 14.3 |        
   66143 | 2025-11-03 23:08:21 |      MASTER-Tavrida | (10h 06m 05.12s , +20d 46m 52.5s) |   C |    60 | 14.8 |        
   66188 | 2025-11-03 23:09:05 |   MASTER-Kislovodsk | (09h 45m 44.30s , +16d 15m 44.3s) |   C |    60 | 14.6 |        
   66268 | 2025-11-03 23:10:25 |   MASTER-Kislovodsk | (09h 45m 37.28s , +16d 14m 49.5s) |   C |    60 | 15.0 |        
   66328 | 2025-11-03 23:10:25 |   MASTER-Kislovodsk | (09h 45m 37.28s , +16d 14m 49.4s) |   C |   180 | 16.6 |  Coadd 
   66322 | 2025-11-03 23:11:19 |      MASTER-Tavrida | (09h 27m 05.34s , +15d 31m 34.4s) |   C |    60 | 16.1 |        
   66676 | 2025-11-03 23:17:14 |   MASTER-Kislovodsk | (09h 45m 43.23s , +16d 16m 03.7s) |   C |    60 | 16.3 |        
   66676 | 2025-11-03 23:17:14 |   MASTER-Kislovodsk | (09h 45m 50.89s , +15d 54m 01.9s) |   C |    60 | 16.5 |        
   66708 | 2025-11-03 23:17:45 |      MASTER-Tavrida | (09h 26m 34.95s , +22d 02m 43.8s) |   C |    60 | 16.9 |        
   66756 | 2025-11-03 23:18:34 |   MASTER-Kislovodsk | (09h 45m 46.97s , +15d 55m 46.6s) |   C |    60 | 16.7 |        
   66756 | 2025-11-03 23:18:34 |   MASTER-Kislovodsk | (09h 45m 39.21s , +16d 17m 48.1s) |   C |    60 | 16.3 |        
   66789 | 2025-11-03 23:19:07 |      MASTER-Tavrida | (09h 54m 31.91s , +23d 22m 17.1s) |   C |    60 | 17.1 |        
   66836 | 2025-11-03 23:19:54 |   MASTER-Kislovodsk | (09h 45m 46.98s , +15d 53m 57.9s) |   C |    60 | 16.7 |        
   66836 | 2025-11-03 23:19:54 |   MASTER-Kislovodsk | (09h 45m 39.10s , +16d 15m 58.7s) |   C |    60 | 16.3 |        
   66896 | 2025-11-03 23:19:54 |   MASTER-Kislovodsk | (09h 45m 39.10s , +16d 15m 58.7s) |   C |   180 | 16.8 |  Coadd 
   66917 | 2025-11-03 23:21:14 |   MASTER-Kislovodsk | (09h 45m 51.06s , +15d 55m 42.0s) |   C |    60 | 16.8 |        
   66917 | 2025-11-03 23:21:14 |   MASTER-Kislovodsk | (09h 45m 43.07s , +16d 17m 42.5s) |   C |    60 | 16.5 |        
   66968 | 2025-11-03 23:22:05 |      MASTER-Tavrida | (09h 31m 55.01s , +23d 19m 40.3s) |   C |    60 | 17.2 |        
   66996 | 2025-11-03 23:22:34 |   MASTER-Kislovodsk | (09h 45m 45.14s , +15d 55m 04.0s) |   C |    60 | 16.3 |        
   66996 | 2025-11-03 23:22:34 |   MASTER-Kislovodsk | (09h 45m 37.01s , +16d 17m 04.4s) |   C |    60 | 16.1 |        
   67076 | 2025-11-03 23:23:54 |   MASTER-Kislovodsk | (09h 45m 45.15s , +15d 56m 08.7s) |   C |    60 | 16.6 |        
   67076 | 2025-11-03 23:23:54 |   MASTER-Kislovodsk | (09h 45m 36.92s , +16d 18m 08.8s) |   C |    60 | 16.3 |        
   67157 | 2025-11-03 23:25:14 |   MASTER-Kislovodsk | (09h 45m 41.84s , +16d 17m 11.6s) |   C |    60 | 16.4 |        
   67157 | 2025-11-03 23:25:14 |   MASTER-Kislovodsk | (09h 45m 50.18s , +15d 55m 11.6s) |   C |    60 | 16.5 |        
   67237 | 2025-11-03 23:26:34 |   MASTER-Kislovodsk | (09h 45m 35.80s , +16d 16m 16.3s) |   C |    60 | 16.4 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.