[vsnet-grb-info 28309] Swift GRB210708.10: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30412
SUBJECT: Swift GRB210708.10: Global MASTER-Net observations report 
DATE:    21/07/08 02:39:09 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, 
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov,  D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile 
(Observatorio Astronomico Felix Aguilar OAFA),

R. Rebolo, M. Serra 
(The Instituto de Astrofisica de Canarias),

D. Buckley 
(South African Astronomical Observatory),

O.A. Gres, N.M. Budnev, O.Ershova 
(Irkutsk State University, API),

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

V. Yurkov, A. Gabovich, Yu. Sergienko 
(Blagoveschensk Educational State University)




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 GRB210708.10 (trigger No 1059460,11h 34m 47.76s , -49d 11m 13.2s, R=0.05) errorbox  63 sec after notice time and 90 sec after trigger time at 2021-07-08 02:27:07 UT, with upper limit up to  17.8 mag. The observations began at zenith distance = 62 deg. The sun  altitude  is -59.3 deg. 

The galactic latitude b = 12 deg., longitude l = 291 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1655482

We obtain a following upper limits.  

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

      96 |         MASTER-OAFA |   C |    10 | 17.2 |        
     125 |         MASTER-OAFA |   C |    10 | 17.1 |        
     179 |         MASTER-OAFA |   C |    30 | 17.8 |        
     229 |         MASTER-OAFA |   C |    30 | 17.8 |        
Filter C is a clear (unfiltred) band. 


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