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GCN Circular 41068

Subject
Fermi GRB 250711A: Global MASTER-Net observations report
Event
GRB 250711A
Date
2025-07-11T20:30:49Z (2 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-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 250711A ( Fermi GBM team, GCN 41064Loading...
 
 ) errorbox  16346 sec after notice time and 16354 sec after trigger time at 2025-07-11 19:12:47 UT, with upper limit up to  14.3 mag. The observations began at zenith distance =  3 deg. The sun  altitude  is -19.0 deg. 

The galactic latitude b = 33 deg., longitude l = 71 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2932393

We obtain a following upper limits.  

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

   16384 | 2025-07-11 19:12:47 |   MASTER-Kislovodsk | (17h 35m 16.38s , +45d 13m 31.4s) |   C |    60 | 14.3 |        
   16560 | 2025-07-11 19:15:42 |   MASTER-Kislovodsk | (17h 23m 53.68s , +45d 14m 28.9s) |   C |    60 | 14.1 |        
   16814 | 2025-07-11 19:19:57 |   MASTER-Kislovodsk | (17h 27m 35.59s , +47d 07m 43.8s) |   C |    60 | 14.1 |        
   16990 | 2025-07-11 19:22:53 |   MASTER-Kislovodsk | (17h 35m 19.19s , +45d 13m 39.0s) |   C |    60 | 14.3 |        
   17157 | 2025-07-11 19:25:39 |   MASTER-Kislovodsk | (17h 25m 01.99s , +45d 04m 21.7s) |   C |    60 | 14.1 |        
   17316 | 2025-07-11 19:28:19 |   MASTER-Kislovodsk | (17h 12m 47.71s , +43d 09m 45.1s) |   C |    60 | 13.8 |        
   17396 | 2025-07-11 19:29:38 |   MASTER-Kislovodsk | (17h 23m 53.71s , +43d 09m 27.0s) |   C |    60 | 14.0 |        
   17475 | 2025-07-11 19:30:58 |   MASTER-Kislovodsk | (17h 16m 58.46s , +46d 58m 51.1s) |   C |    60 | 14.0 |        
   17555 | 2025-07-11 19:32:17 |   MASTER-Kislovodsk | (17h 28m 41.84s , +46d 57m 30.3s) |   C |    60 | 14.3 |        
   17725 | 2025-07-11 19:35:07 |   MASTER-Kislovodsk | (17h 14m 53.39s , +45d 04m 13.4s) |   C |    60 | 14.2 |        
   17804 | 2025-07-11 19:36:27 |   MASTER-Kislovodsk | (17h 24m 56.77s , +45d 02m 55.6s) |   C |    60 | 13.9 |        
   17883 | 2025-07-11 19:37:46 |   MASTER-Kislovodsk | (17h 33m 42.38s , +43d 11m 07.6s) |   C |    60 | 14.1 |        
   18042 | 2025-07-11 19:40:25 |   MASTER-Kislovodsk | (17h 12m 51.25s , +43d 11m 29.3s) |   C |    60 | 13.5 |        
   18122 | 2025-07-11 19:41:44 |   MASTER-Kislovodsk | (17h 23m 46.84s , +43d 10m 09.4s) |   C |    60 | 14.1 |        
   18201 | 2025-07-11 19:43:04 |   MASTER-Kislovodsk | (17h 16m 53.40s , +46d 58m 56.6s) |   C |    60 | 14.1 |        
   18281 | 2025-07-11 19:44:23 |   MASTER-Kislovodsk | (17h 28m 41.67s , +46d 58m 00.4s) |   C |    60 | 14.1 |        
   19103 | 2025-07-11 19:58:05 |   MASTER-Kislovodsk | (17h 14m 39.74s , +45d 06m 31.7s) |   C |    60 | 14.2 |        
   19183 | 2025-07-11 19:59:25 |   MASTER-Kislovodsk | (17h 24m 52.80s , +45d 05m 05.2s) |   C |    60 | 14.2 |        
   19262 | 2025-07-11 20:00:45 |   MASTER-Kislovodsk | (17h 33m 37.59s , +43d 12m 30.2s) |   C |    60 | 14.3 |        
   19421 | 2025-07-11 20:03:23 |   MASTER-Kislovodsk | (17h 12m 39.43s , +43d 12m 29.1s) |   C |    60 | 14.1 |        
   19500 | 2025-07-11 20:04:43 |   MASTER-Kislovodsk | (17h 23m 43.29s , +43d 11m 35.5s) |   C |    60 | 14.1 |        
   19580 | 2025-07-11 20:06:03 |   MASTER-Kislovodsk | (17h 16m 41.83s , +46d 58m 18.5s) |   C |    60 | 14.1 |        
   19660 | 2025-07-11 20:07:22 |   MASTER-Kislovodsk | (17h 28m 32.18s , +46d 58m 57.2s) |   C |    60 | 14.0 |        
   19739 | 2025-07-11 20:08:42 |   MASTER-Kislovodsk | (17h 36m 11.71s , +45d 06m 17.3s) |   C |    60 | 14.1 |        
   20058 | 2025-07-11 20:14:00 |   MASTER-Kislovodsk | (17h 33m 29.49s , +43d 12m 34.0s) |   C |    60 | 14.1 |        
   20217 | 2025-07-11 20:16:39 |   MASTER-Kislovodsk | (17h 12m 38.24s , +43d 10m 13.3s) |   C |    60 | 13.8 |        
   20296 | 2025-07-11 20:17:59 |   MASTER-Kislovodsk | (17h 23m 42.07s , +43d 10m 47.1s) |   C |    60 | 14.2 |        
   20376 | 2025-07-11 20:19:18 |   MASTER-Kislovodsk | (17h 16m 42.38s , +47d 00m 04.9s) |   C |    60 | 13.8 |        
   20455 | 2025-07-11 20:20:38 |   MASTER-Kislovodsk | (17h 28m 26.32s , +46d 58m 17.9s) |   C |    60 | 14.1 |        
   20535 | 2025-07-11 20:21:57 |   MASTER-Kislovodsk | (17h 36m 11.04s , +45d 06m 15.9s) |   C |    60 | 14.1 |        
   20694 | 2025-07-11 20:24:36 |   MASTER-Kislovodsk | (17h 14m 31.90s , +45d 06m 29.8s) |   C |    60 | 13.8 |        
Filter C is a clear (unfiltred) band. 


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