GCN Circular 43913

Subject
EP260302a: Global MASTER-Net observations report
Event
EP260302a
Date
2026-03-03T19:18:35Z (8 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-SAAO robotic telescope  [1]  located in South Africa (South African Astronomical Observatory) was pointed to the EP260302a ( EP Team et al., GCN 43899Loading...
 
 ) errorbox  57834 sec after notice time and 69373 sec after trigger time at 2026-03-03 18:55:35 UT, with upper limit up to  18.3 mag. The observations began at zenith distance = 38 deg. The sun  altitude  is -22.0 deg. 

The galactic latitude b = -14 deg., longitude l = 282 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3165840

We obtain a following upper limits.  

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

   69433 | 2026-03-03 18:55:35 |         MASTER-SAAO | (08h 50m 51.10s , -66d 07m 10.9s) |   C |   120 | 18.3 |        
   69433 | 2026-03-03 18:55:35 |         MASTER-SAAO | (08h 46m 26.64s , -65d 51m 45.5s) |   C |   120 | 18.1 |        
   69556 | 2026-03-03 18:58:07 |         MASTER-SAAO | (08h 50m 47.34s , -66d 05m 34.5s) |   C |    60 | 18.1 |        
   69556 | 2026-03-03 18:58:07 |         MASTER-SAAO | (08h 46m 22.97s , -65d 50m 10.3s) |   C |    60 | 18.0 |        
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