GCN Circular 43403

Subject
Swift GRB 260114A: Global MASTER-Net observations report
Event
GRB 260114A
Date
2026-01-14T17:42:32Z (4 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-Tunka robotic telescope  [1]  located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 260114A ( R. A. J. Eyles-Ferris et al., GCN 43396Loading...
 
 ) errorbox  13094 sec after notice time and 13137 sec after trigger time at 2026-01-14 15:19:23 UT, with upper limit up to  20.0 mag. The observations began at zenith distance = 60 deg. The sun  altitude  is -52.6 deg. 

The galactic latitude b = -28 deg., longitude l = 207 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3101880

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   13167 |        MASTER-Tunka |   C |    60 | 19.4 |        
   13227 |        MASTER-Tunka |   C |   180 | 20.0 |  Coadd 
   13241 |        MASTER-Tunka |   C |    60 | 15.5 |        
   13241 |        MASTER-Tunka |   C |    60 | 19.2 |        
   13313 |        MASTER-Tunka |   C |    60 | 19.1 |        
   13389 |        MASTER-Tunka |   C |    60 | 14.9 |        
   13389 |        MASTER-Tunka |   C |    60 | 19.1 |        
   13449 |        MASTER-Tunka |   C |   180 | 19.8 |  Coadd 
   13461 |        MASTER-Tunka |   C |    60 | 15.2 |        
   13461 |        MASTER-Tunka |   C |    60 | 19.2 |        
   13536 |        MASTER-Tunka |   C |    60 | 17.8 |        
   13536 |        MASTER-Tunka |   C |    60 | 19.0 |        
   13611 |        MASTER-Tunka |   C |    60 | 18.7 |        
   13611 |        MASTER-Tunka |   C |    60 | 19.3 |        
   14458 |        MASTER-Tunka |   C |    60 | 19.1 |        
   14458 |        MASTER-Tunka |   C |    60 | 18.6 |        
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