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GCN Circular 41756

Subject
EP250908c: Global MASTER-Net observations report
Event
EP250908c
Date
2025-09-09T03:01:15Z (5 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 EP250908c ( EP Team et al., GCN 41754Loading...
 
 ) errorbox 385 sec after trigger time at 2025-09-08 23:57:19 UT, with upper limit up to  19.4 mag. The observations began at zenith distance = 66 deg. The sun  altitude  is -21.0 deg. 

The galactic latitude b = -67 deg., longitude l = 309 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2987645

We obtain a following upper limits.  

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

     426 | 2025-09-08 23:57:19 |         MASTER-OAFA | (00h 32m 33.78s , -50d 34m 25.0s) |   C |    80 | 19.4 |        
     517 | 2025-09-08 23:58:46 |         MASTER-OAFA | (00h 32m 33.61s , -50d 34m 21.6s) |   C |    90 | 19.4 |        
     623 | 2025-09-09 00:00:22 |         MASTER-OAFA | (00h 32m 33.35s , -50d 34m 18.6s) |   C |   110 | 19.4 |        
     704 | 2025-09-09 00:02:17 |         MASTER-OAFA | (00h 32m 33.16s , -50d 34m 16.5s) |   C |    40 | 19.0 |        
     750 | 2025-09-09 00:03:03 |         MASTER-OAFA | (00h 32m 33.01s , -50d 34m 15.4s) |   C |    40 | 19.0 |        
     795 | 2025-09-09 00:03:49 |         MASTER-OAFA | (00h 32m 32.90s , -50d 34m 14.1s) |   C |    40 | 19.0 |        
     842 | 2025-09-09 00:04:35 |         MASTER-OAFA | (00h 32m 32.81s , -50d 34m 12.7s) |   C |    40 | 18.9 |        
     887 | 2025-09-09 00:05:20 |         MASTER-OAFA | (00h 32m 32.71s , -50d 34m 11.3s) |   C |    40 | 19.0 |        
     932 | 2025-09-09 00:06:06 |         MASTER-OAFA | (00h 32m 32.57s , -50d 34m 10.1s) |   C |    40 | 19.0 |        
     978 | 2025-09-09 00:06:51 |         MASTER-OAFA | (00h 32m 32.42s , -50d 34m 09.1s) |   C |    40 | 19.0 |        
    1023 | 2025-09-09 00:07:37 |         MASTER-OAFA | (00h 32m 32.31s , -50d 34m 08.0s) |   C |    40 | 18.9 |        
    1069 | 2025-09-09 00:08:23 |         MASTER-OAFA | (00h 32m 32.23s , -50d 34m 06.6s) |   C |    40 | 18.9 |        
    1116 | 2025-09-09 00:09:09 |         MASTER-OAFA | (00h 32m 32.14s , -50d 34m 05.4s) |   C |    40 | 18.9 |        
    1161 | 2025-09-09 00:09:55 |         MASTER-OAFA | (00h 32m 32.02s , -50d 34m 04.0s) |   C |    40 | 18.9 |        
    1207 | 2025-09-09 00:10:40 |         MASTER-OAFA | (00h 32m 31.90s , -50d 34m 03.0s) |   C |    40 | 19.0 |        
    1253 | 2025-09-09 00:11:26 |         MASTER-OAFA | (00h 32m 31.80s , -50d 34m 01.9s) |   C |    40 | 19.0 |        
    1298 | 2025-09-09 00:12:12 |         MASTER-OAFA | (00h 32m 31.67s , -50d 34m 01.1s) |   C |    40 | 18.9 |        
    1344 | 2025-09-09 00:12:57 |         MASTER-OAFA | (00h 32m 31.57s , -50d 33m 59.7s) |   C |    40 | 18.9 |        
    1390 | 2025-09-09 00:13:43 |         MASTER-OAFA | (00h 32m 31.45s , -50d 33m 58.3s) |   C |    40 | 19.0 |        
    1436 | 2025-09-09 00:14:29 |         MASTER-OAFA | (00h 32m 31.33s , -50d 33m 57.1s) |   C |    40 | 18.9 |        
    1481 | 2025-09-09 00:15:15 |         MASTER-OAFA | (00h 32m 31.23s , -50d 33m 56.1s) |   C |    40 | 19.0 |        
    1528 | 2025-09-09 00:16:01 |         MASTER-OAFA | (00h 32m 31.11s , -50d 33m 54.9s) |   C |    40 | 18.9 |        
    1573 | 2025-09-09 00:16:46 |         MASTER-OAFA | (00h 32m 31.00s , -50d 33m 53.6s) |   C |    40 | 18.9 |        
    1618 | 2025-09-09 00:17:32 |         MASTER-OAFA | (00h 32m 30.90s , -50d 33m 52.2s) |   C |    40 | 18.8 |        
Filter C is a clear (unfiltred) band. 


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