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GCN Circular 39295

Subject
Integral GRB250211.89: Global MASTER-Net observations report
Date
2025-02-12T01:19:50Z (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-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the Integral GRB250211.89 (trigger No 11044,18h 25m 33.49s , -31d 57m 36.2s, R=0.0533333) errorbox  12195 sec after notice time and 12210 sec after trigger time at 2025-02-12 00:51:28 UT, with upper limit up to  16.7 mag. The observations began at zenith distance = 81 deg. The sun  altitude  is -36.1 deg. 

The galactic latitude b = -10 deg., longitude l =  2 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2775663

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   12300 |         MASTER-SAAO |   C |   180 | 16.1 |        
   12480 |         MASTER-SAAO |   C |   540 | 15.8 |  Coadd 
   12500 |         MASTER-SAAO |   C |   180 | 16.2 |        
   12699 |         MASTER-SAAO |   C |   180 | 16.4 |        
   12904 |         MASTER-SAAO |   C |   180 | 16.4 |        
   13103 |         MASTER-SAAO |   C |   180 | 16.5 |        
   13302 |         MASTER-SAAO |   C |   180 | 16.6 |        
   13502 |         MASTER-SAAO |   C |   180 | 16.7 |        
Filter C is a clear (unfiltred) band. 


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