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GCN Circular 40912

Subject
EP250702a: Global MASTER-Net observations report
Event
EP250702a
Date
2025-07-03T11:09:30Z (19 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-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP250702a ( EP Team et al., GCN 40906Loading...
 
 ) errorbox 1 days 2370 sec after trigger time at 2025-07-03 03:33:14 UT, with upper limit up to  17.4 mag. The observations began at zenith distance = 29 deg. The sun  altitude  is -73.4 deg. 

The galactic latitude b = -6 deg., longitude l = 27 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2923840

We obtain a following upper limits.  

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

   88860 | 2025-07-03 03:33:14 |         MASTER-OAFA | (18h 57m 22.01s , -08d 01m 07.7s) |   C |   180 | 17.4 |        
   89047 | 2025-07-03 03:36:20 |         MASTER-OAFA | (18h 57m 21.64s , -08d 01m 10.1s) |   C |   180 | 17.3 |        
   89233 | 2025-07-03 03:39:27 |         MASTER-OAFA | (18h 57m 21.26s , -08d 01m 13.3s) |   C |   180 | 17.4 |        
   89419 | 2025-07-03 03:42:32 |         MASTER-OAFA | (18h 57m 20.88s , -08d 01m 16.3s) |   C |   180 | 17.3 |        
  104587 | 2025-07-03 07:56:21 |         MASTER-OAFA | (18h 58m 32.22s , -07d 41m 30.2s) |   C |    60 | 17.4 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.