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GCN Circular 40893

Subject

Swift GRB250702.88: Global MASTER-Net observations report

Event

GRB 250702.88

Date

2025-07-02T21:36:54Z (3 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-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 Swift GRB250702.88 (trigger No 1329888,14h 11m 43.92s , +16d 41m 56.4s, R=0.05) errorbox  1057 sec after notice time and 1076 sec after trigger time at 2025-07-02 21:24:39 UT, with upper limit up to  16.9 mag. The observations began at zenith distance = 68 deg. The sun  altitude  is -70.5 deg. 

The galactic latitude b = 68 deg., longitude l =  8 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2923573

We obtain a following upper limits.  

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

    1106 |         MASTER-SAAO |  P/ |    60 | 16.2 |        
    1106 |         MASTER-SAAO | P\\ |    60 | 16.2 |        
    1185 |         MASTER-SAAO |  P/ |    60 | 16.8 |        
    1185 |         MASTER-SAAO | P\\ |    60 | 16.7 |        
    1264 |         MASTER-SAAO |  P/ |    60 | 16.9 |        
    1264 |         MASTER-SAAO | P\\ |    60 | 16.8 |        
    1343 |         MASTER-SAAO |  P/ |    60 | 13.8 |        


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