GCN Circular 43052

Subject
Fermi GRB 251208C: Global MASTER-Net observations report
Event
GRB 251208C
Date
2025-12-09T15:30:32Z (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 251208C ( Fermi GBM team, GCN 43030Loading...
 
 ) errorbox  1 days 6304 sec after notice time and 1 days 6326 sec after trigger time at 2025-12-09 14:37:58 UT, with upper limit up to  15.6 mag. Observations started at twilight.  The observations began at zenith distance = 77 deg. The sun  altitude  is -11.0 deg. 

The galactic latitude b = -39 deg., longitude l = 14 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3064550

We obtain a following upper limits.  

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

   92816 | 2025-12-09 14:37:58 |   MASTER-Kislovodsk | (20h 51m 14.16s , -30d 11m 05.4s) |   C |   180 | 12.8 |        
   93444 | 2025-12-09 14:49:26 |   MASTER-Kislovodsk | (20h 51m 12.38s , -29d 02m 48.7s) |   C |    60 | 13.6 |        
   93444 | 2025-12-09 14:49:26 |   MASTER-Kislovodsk | (20h 46m 31.77s , -28d 42m 11.8s) |   C |    60 | 14.3 |        
   93525 | 2025-12-09 14:50:47 |   MASTER-Kislovodsk | (21h 01m 36.94s , -30d 57m 36.2s) |   C |    60 | 12.5 |        
   93525 | 2025-12-09 14:50:47 |   MASTER-Kislovodsk | (20h 56m 51.84s , -30d 36m 58.9s) |   C |    60 | 13.2 |        
   93604 | 2025-12-09 14:52:07 |   MASTER-Kislovodsk | (20h 56m 03.09s , -27d 10m 45.4s) |   C |    60 | 14.7 |        
   93604 | 2025-12-09 14:52:07 |   MASTER-Kislovodsk | (20h 51m 26.46s , -26d 50m 06.8s) |   C |    60 | 15.1 |        
   93684 | 2025-12-09 14:53:27 |   MASTER-Kislovodsk | (21h 00m 18.16s , -28d 43m 43.1s) |   C |    60 | 14.0 |        
   93684 | 2025-12-09 14:53:27 |   MASTER-Kislovodsk | (21h 04m 59.03s , -29d 04m 22.4s) |   C |    60 | 13.9 |        
   93765 | 2025-12-09 14:54:47 |   MASTER-Kislovodsk | (20h 38m 01.33s , -26d 48m 57.8s) |   C |    60 | 14.5 |        
   93765 | 2025-12-09 14:54:47 |   MASTER-Kislovodsk | (20h 42m 37.44s , -27d 09m 35.3s) |   C |    60 | 14.1 |        
   93845 | 2025-12-09 14:56:07 |   MASTER-Kislovodsk | (20h 32m 54.99s , -28d 43m 10.7s) |   C |    60 | 13.1 |        
   93845 | 2025-12-09 14:56:07 |   MASTER-Kislovodsk | (20h 37m 34.74s , -29d 03m 45.7s) |   C |    60 | 12.5 |        
   93925 | 2025-12-09 14:57:27 |   MASTER-Kislovodsk | (20h 48m 49.10s , -25d 15m 12.4s) |   C |    60 | 14.9 |        
   93925 | 2025-12-09 14:57:27 |   MASTER-Kislovodsk | (20h 44m 16.39s , -24d 54m 32.9s) |   C |    60 | 15.3 |        
   94005 | 2025-12-09 14:58:47 |   MASTER-Kislovodsk | (21h 02m 06.24s , -25d 16m 49.4s) |   C |    60 | 15.1 |        
   94005 | 2025-12-09 14:58:47 |   MASTER-Kislovodsk | (20h 57m 32.94s , -24d 56m 08.5s) |   C |    60 | 15.6 |        
   94085 | 2025-12-09 15:00:07 |   MASTER-Kislovodsk | (21h 09m 35.36s , -27d 08m 43.7s) |   C |    60 | 14.6 |        
   94085 | 2025-12-09 15:00:07 |   MASTER-Kislovodsk | (21h 04m 58.34s , -26d 48m 02.7s) |   C |    60 | 14.9 |        
   94697 | 2025-12-09 15:10:19 |   MASTER-Kislovodsk | (21h 10m 53.04s , -30d 37m 42.3s) |   C |    60 | 12.2 |        
   94857 | 2025-12-09 15:12:59 |   MASTER-Kislovodsk | (20h 35m 32.24s , -25d 17m 04.5s) |   C |    60 | 13.9 |        
   94947 | 2025-12-09 15:14:29 |   MASTER-Kislovodsk | (21h 18m 27.36s , -29d 04m 37.5s) |   C |    60 | 13.4 |        
   94947 | 2025-12-09 15:14:29 |   MASTER-Kislovodsk | (21h 13m 59.27s , -28d 44m 11.1s) |   C |    60 | 13.7 |        
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