GCN Circular 42646

Subject
SVOM GRB251111.42: Global MASTER-Net observations report
Event
GRB 251111.42
Date
2025-11-11T15:28:29Z (2 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-Kislovodsk robotic telescope  [1]  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the SVOM GRB251111.42 (trigger No 1762855221,21h 58m 08.11s , -32d 32m 58.9s, R=1) errorbox  17209 sec after notice time and 17236 sec after trigger time at 2025-11-11 14:47:37 UT, with upper limit up to  16.2 mag. Observations started at twilight.  The observations began at zenith distance = 76 deg. The sun  altitude  is -10.6 deg. 

The galactic latitude b = -53 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=3038591

We obtain a following upper limits.  

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

   17327 | 2025-11-11 14:47:37 |   MASTER-Kislovodsk | (21h 55m 21.98s , -32d 13m 40.7s) |   C |   180 | 15.8 |        
   17327 | 2025-11-11 14:47:37 |   MASTER-Kislovodsk | (22h 00m 17.67s , -32d 36m 56.7s) |   C |   180 | 16.2 |        
   17468 | 2025-11-11 14:50:58 |   MASTER-Kislovodsk | (22h 00m 08.74s , -32d 41m 52.6s) |   C |    60 | 15.6 |        
   17468 | 2025-11-11 14:50:58 |   MASTER-Kislovodsk | (22h 05m 05.54s , -33d 05m 13.1s) |   C |    60 | 16.2 |        
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