TITLE:   GCN CIRCULAR
NUMBER:  41002
SUBJECT: Swift GRB 250706A: Global MASTER-Net observations report
DATE:    25/07/07 08:24:35 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

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 Swift GRB 250706A ( M. J. Moss et al., GCN 40988) errorbox  46980 sec after notice time and 47035 sec after trigger time at 2025-07-07 04:52:26 UT, with upper limit up to  18.0 mag. The observations began at zenith distance = 64 deg. The sun  altitude  is -81.1 deg. 

The galactic latitude b = 13 deg., longitude l = 63 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2927564

We obtain a following upper limits.  

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

   47126 |         MASTER-OAFA |   C |   180 | 17.7 |        
   47319 |         MASTER-OAFA |   C |   180 | 17.8 |        
   49913 |         MASTER-OAFA |   C |   180 | 18.0 |        
   50108 |         MASTER-OAFA |   C |   180 | 18.0 |        
   51188 |         MASTER-OAFA |   C |   180 | 17.8 |        
   51392 |         MASTER-OAFA |   C |   180 | 17.9 |        
   52485 |         MASTER-OAFA |   C |   180 | 17.8 |        
   52679 |         MASTER-OAFA |   C |   180 | 17.6 |        
   53664 |         MASTER-OAFA |   C |   180 | 17.6 |        
   53965 |         MASTER-OAFA |   C |   180 | 17.7 |        
   54883 |         MASTER-OAFA |   C |   180 | 17.7 |        
   55239 |         MASTER-OAFA |   C |   180 | 17.7 |        
   56730 |         MASTER-OAFA |   C |   180 | 17.4 |        
   56924 |         MASTER-OAFA |   C |   180 | 17.2 |        
   57911 |         MASTER-OAFA |   C |   180 | 17.4 |        
   58211 |         MASTER-OAFA |   C |   180 | 17.1 |        
   59205 |         MASTER-OAFA |   C |   180 | 16.4 |        
Filter C is a clear (unfiltred) band. 


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