GCN Circular 43306

Subject
EP260101a: Global MASTER-Net observations report
Event
EP260101a
Date
2026-01-02T15:18:21Z (3 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) was pointed to the EP260101a ( EP Team et al., GCN 43288Loading...
 
 ) errorbox  1 days 27579 sec after notice time and 1 days 29347 sec after trigger time at 2026-01-02 14:44:49 UT, with upper limit up to  15.3 mag. Observations started at twilight.  The observations began at zenith distance = 30 deg. The sun  altitude  is -10.3 deg. 

The galactic latitude b = -16 deg., longitude l = 150 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3092541

We obtain a following upper limits.  

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

  115778 | 2026-01-02 14:44:49 |   MASTER-Kislovodsk | (03h 03m 11.45s , +39d 18m 40.8s) |   C |    60 | 15.3 |        
  116532 | 2026-01-02 14:57:23 |   MASTER-Kislovodsk | (03h 03m 11.69s , +39d 19m 18.4s) |   C |    60 | 14.7 |        
  116631 | 2026-01-02 14:59:03 |   MASTER-Kislovodsk | (03h 03m 05.44s , +39d 18m 20.6s) |   C |    60 | 14.5 |        
  116730 | 2026-01-02 15:00:41 |   MASTER-Kislovodsk | (03h 03m 10.27s , +39d 18m 43.9s) |   C |    60 | 15.0 |        
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