GCN Circular 42912

Subject
Fermi GRB 251130B: Global MASTER-Net observations report
Event
GRB 251130B
Date
2025-12-01T02:15:34Z (a day 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-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 42905Loading...
 
 ) 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