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GCN Circular 39301

Subject
Fermi trigger No 760945500: Global MASTER-Net observations report
Date
2025-02-12T17:30:30Z (a month ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
V.Lipunov, E.Gorbovskoy, N.Tiurina,  P.Balanutsa, , D.Vlasenko, I.Panchenko,
A.Kuznetsov,  G.Antipov,  A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, 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. 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-Tunka robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB250211.24 (trigger No 760945500,05h 37m 07.20s , +73d 12m 00.0s, R=1.08) errorbox  1 days 30989 sec after notice time and 1 days 31021 sec after trigger time at 2025-02-12 14:21:57 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 24 deg. The sun  altitude  is -38.1 deg. 

The galactic latitude b = 21 deg., longitude l = 140 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2775055

We obtain a following upper limits.  

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

  117435 | 2025-02-12 14:21:57 |        MASTER-Tunka | (05h 31m 57.85s , +73d 40m 33.8s) |   C |    25 | 16.5 |        
  117534 | 2025-02-12 14:23:39 |        MASTER-Tunka | (05h 01m 45.40s , +71d 46m 33.1s) |   C |    20 | 16.3 |        
  118179 | 2025-02-12 14:34:29 |        MASTER-Tunka | (05h 01m 36.73s , +71d 48m 31.6s) |   C |    10 | 16.1 |        
  118962 | 2025-02-12 14:47:29 |        MASTER-Tunka | (05h 15m 12.08s , +75d 35m 19.0s) |   C |    15 | 17.5 |        
  119048 | 2025-02-12 14:48:53 |        MASTER-Tunka | (05h 45m 25.39s , +71d 49m 25.5s) |   C |    20 | 15.5 |        
  119984 | 2025-02-12 15:04:31 |        MASTER-Tunka | (05h 31m 28.65s , +73d 42m 32.1s) |   C |    15 | 16.8 |        
Filter C is a clear (unfiltred) band. 


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