GCN Circular 42938

Subject
Fermi GRB 251202A: Global MASTER-Net observations report
Event
GRB 251202A
Date
2025-12-02T03:30:34Z (17 hours 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-SAAO robotic telescope  [1]  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 251202A ( Fermi GBM team, GCN 42933Loading...
 
 ) errorbox  570 sec after notice time and 604 sec after trigger time at 2025-12-02 02:00:56 UT, with upper limit up to  18.8 mag. Observations started at twilight.  The observations began at zenith distance = 76 deg. The sun  altitude  is -15.8 deg. 

The galactic latitude b = 31 deg., longitude l = 177 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3057770

We obtain a following upper limits.  

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

     634 | 2025-12-02 02:00:56 |         MASTER-SAAO | (07h 56m 46.47s , +43d 37m 13.0s) |   C |    60 | 17.7 |        
     694 | 2025-12-02 02:00:56 |         MASTER-SAAO | (07h 56m 46.46s , +43d 37m 13.0s) |   C |   180 | 18.6 |  Coadd 
     634 | 2025-12-02 02:00:56 |         MASTER-SAAO | (07h 59m 07.79s , +43d 21m 09.1s) |   C |    60 | 18.0 |        
     694 | 2025-12-02 02:00:56 |         MASTER-SAAO | (07h 59m 07.80s , +43d 21m 09.1s) |   C |   180 | 18.8 |  Coadd 
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