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GCN Circular 41210

Subject
EP250730a: Global MASTER-Net observations report
Event
EP250730a
Date
2025-07-31T08:45:26Z (13 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  (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 EP250730a ( EP Team et al., GCN 41207Loading...
 
 ) errorbox  762 sec after notice time and 79097 sec after trigger time at 2025-07-31 04:04:26 UT, with upper limit up to  20.0 mag. The observations began at zenith distance = 28 deg. The sun  altitude  is -74.8 deg. 

The galactic latitude b = -30 deg., longitude l = 44 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2953990

We obtain a following upper limits.  

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

   79128 | 2025-07-31 04:04:26 |         MASTER-OAFA | (20h 48m 25.83s , -04d 35m 50.0s) |   C |    60 | 19.5 |        
   79204 | 2025-07-31 04:05:42 |         MASTER-OAFA | (20h 56m 28.38s , -04d 37m 17.4s) |   C |    60 | 19.9 |        
   79264 | 2025-07-31 04:05:42 |         MASTER-OAFA | (20h 56m 28.38s , -04d 37m 17.3s) |   C |   180 | 20.0 |  Coadd 
   79380 | 2025-07-31 04:08:39 |         MASTER-OAFA | (20h 48m 21.81s , -04d 36m 50.2s) |   C |    60 | 19.6 |        
   80221 | 2025-07-31 04:22:39 |         MASTER-OAFA | (20h 56m 21.95s , -04d 36m 17.7s) |   C |    60 | 19.4 |        
   80384 | 2025-07-31 04:25:22 |         MASTER-OAFA | (20h 48m 19.67s , -04d 38m 26.9s) |   C |    60 | 19.3 |        
   80459 | 2025-07-31 04:26:37 |         MASTER-OAFA | (20h 56m 28.18s , -04d 38m 08.1s) |   C |    60 | 19.0 |        
   82546 | 2025-07-31 05:01:24 |         MASTER-OAFA | (20h 48m 14.53s , -04d 39m 59.5s) |   C |    60 | 19.6 |        
   82622 | 2025-07-31 05:02:41 |         MASTER-OAFA | (20h 56m 20.98s , -04d 38m 21.8s) |   C |    60 | 19.7 |        
   82682 | 2025-07-31 05:02:41 |         MASTER-OAFA | (20h 56m 20.99s , -04d 38m 21.9s) |   C |   180 | 19.8 |  Coadd 
   82805 | 2025-07-31 05:05:44 |         MASTER-OAFA | (20h 48m 09.69s , -04d 38m 26.0s) |   C |    60 | 19.0 |        
   82880 | 2025-07-31 05:06:59 |         MASTER-OAFA | (20h 56m 18.72s , -04d 39m 15.7s) |   C |    60 | 19.2 |        
   83049 | 2025-07-31 05:09:47 |         MASTER-OAFA | (20h 48m 15.74s , -04d 40m 36.9s) |   C |    60 | 18.0 |        
   83139 | 2025-07-31 05:11:17 |         MASTER-OAFA | (20h 56m 15.54s , -04d 38m 36.4s) |   C |    60 | 18.4 |        
   85345 | 2025-07-31 05:48:03 |         MASTER-OAFA | (20h 48m 01.89s , -04d 41m 11.2s) |   C |    60 | 16.5 |        
   85423 | 2025-07-31 05:49:21 |         MASTER-OAFA | (20h 56m 09.03s , -04d 41m 53.1s) |   C |    60 | 14.9 |        
   85586 | 2025-07-31 05:52:05 |         MASTER-OAFA | (20h 48m 05.61s , -04d 43m 03.1s) |   C |    60 | 14.1 |        
   85696 | 2025-07-31 05:53:54 |         MASTER-OAFA | (20h 56m 05.97s , -04d 41m 44.0s) |   C |    60 | 14.0 |        
   85861 | 2025-07-31 05:56:40 |         MASTER-OAFA | (20h 48m 04.15s , -04d 42m 01.5s) |   C |    60 | 15.2 |        
   85937 | 2025-07-31 05:57:56 |         MASTER-OAFA | (20h 56m 01.37s , -04d 42m 30.3s) |   C |    60 | 15.1 |        
   94065 | 2025-07-31 08:13:23 |         MASTER-OAFA | (20h 52m 50.00s , -04d 44m 13.9s) |   C |    60 | 15.7 |        
   94143 | 2025-07-31 08:14:41 |         MASTER-OAFA | (20h 52m 44.60s , -04d 45m 13.2s) |   C |    60 | 16.9 |        
   94224 | 2025-07-31 08:16:02 |         MASTER-OAFA | (20h 52m 50.40s , -04d 45m 05.9s) |   C |    60 | 18.6 |        
   94299 | 2025-07-31 08:17:17 |         MASTER-OAFA | (20h 52m 46.84s , -04d 43m 27.0s) |   C |    60 | 19.1 |        
   94359 | 2025-07-31 08:17:17 |         MASTER-OAFA | (20h 52m 46.84s , -04d 43m 27.0s) |   C |   180 | 19.5 |  Coadd 
   94374 | 2025-07-31 08:18:33 |         MASTER-OAFA | (20h 52m 46.83s , -04d 44m 55.5s) |   C |    60 | 18.0 |        
   94452 | 2025-07-31 08:19:50 |         MASTER-OAFA | (20h 52m 49.75s , -04d 43m 42.7s) |   C |    60 | 19.5 |        
   94559 | 2025-07-31 08:21:07 |         MASTER-OAFA | (20h 52m 44.72s , -04d 44m 13.2s) |   C |   120 | 19.7 |        
   95484 | 2025-07-31 08:36:32 |         MASTER-OAFA | (20h 52m 44.73s , -04d 43m 16.8s) |   C |   120 | 19.2 |        
   95621 | 2025-07-31 08:38:50 |         MASTER-OAFA | (20h 52m 50.14s , -04d 44m 17.2s) |   C |   120 | 19.6 |        
Filter C is a clear (unfiltred) band. 


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