GCN Circular 42755

Subject
EP251118a: Global MASTER-Net observations report
Event
EP251118a
Date
2025-11-19T08:27:23Z (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-OAFA robotic telescope  [1]  located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP251118a ( EP Team et al., GCN 42749Loading...
 
 ) errorbox  12817 sec after notice time and 54875 sec after trigger time at 2025-11-19 07:57:04 UT, with upper limit up to  20.2 mag. The observations began at zenith distance = 44 deg. The sun  altitude  is -17.5 deg. 

The galactic latitude b = 23 deg., longitude l = 213 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3046754

We obtain a following upper limits.  

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

   54905 | 2025-11-19 07:57:04 |         MASTER-OAFA | (08h 12m 31.85s , +10d 55m 21.3s) |   C |    60 | 20.2 |        
   54982 | 2025-11-19 07:58:20 |         MASTER-OAFA | (08h 12m 38.49s , +10d 54m 18.7s) |   C |    60 | 20.0 |        
   55059 | 2025-11-19 07:59:38 |         MASTER-OAFA | (08h 12m 32.20s , +10d 53m 14.4s) |   C |    60 | 20.0 |        
   55137 | 2025-11-19 08:00:55 |         MASTER-OAFA | (08h 12m 37.33s , +10d 53m 29.6s) |   C |    60 | 20.1 |        
   55223 | 2025-11-19 08:02:21 |         MASTER-OAFA | (08h 12m 33.38s , +10d 54m 50.5s) |   C |    60 | 20.2 |        
   55301 | 2025-11-19 08:03:39 |         MASTER-OAFA | (08h 12m 32.94s , +10d 53m 07.3s) |   C |    60 | 20.1 |        
   55408 | 2025-11-19 08:04:56 |         MASTER-OAFA | (08h 12m 34.44s , +10d 54m 29.2s) |   C |   120 | 20.0 |        
   55544 | 2025-11-19 08:07:13 |         MASTER-OAFA | (08h 12m 28.30s , +10d 53m 45.7s) |   C |   120 | 20.1 |        
   55681 | 2025-11-19 08:09:30 |         MASTER-OAFA | (08h 12m 28.13s , +10d 54m 37.0s) |   C |   120 | 20.0 |        
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