GCN Circular 43309

Subject
SVOM GRB260102.17: Global MASTER-Net observations report
Event
GRB 260102.17
Date
2026-01-02T18:14:24Z (15 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-Kislovodsk robotic telescope  [1]  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SVOM GRB260102.17 (trigger No 1767326986,12h 15m 31.27s , +48d 15m 29.9s, R=0.0849) errorbox  48331 sec after notice time and 48428 sec after trigger time at 2026-01-02 17:36:54 UT, with upper limit up to  15.1 mag. The observations began at zenith distance = 81 deg. The sun  altitude  is -41.1 deg. 

The galactic latitude b = 68 deg., longitude l = 138 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3093252

We obtain a following upper limits.  

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

   33488 | 2026-01-02 13:26:23 |             MASTER- | (12h 20m 52.08s , +49d 49m 23.4s) |   C |   180 | 17.3 |        
   48459 | 2026-01-02 17:36:54 |   MASTER-Kislovodsk | (12h 14m 33.74s , +47d 55m 28.1s) |   C |    60 | 15.1 |        
   50357 | 2026-01-02 18:08:32 |   MASTER-Kislovodsk | (12h 14m 30.88s , +47d 52m 14.0s) |   C |    60 | 15.5 |        
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