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GCN Circular 29609

Subject
Swift GRB210307.36: Global MASTER-Net observations report
Date
2021-03-07T08:55:38Z (3 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@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 GRB210307.36 (trigger No 1036139,07h 56m 45.60s , -66d 57m 46.8s, R=0.05) errorbox  6 sec after notice time and 54 sec after trigger time at 2021-03-07 08:43:33 UT, with upper limit up to  18.1 mag. The observations began at zenith distance = 69 deg. The sun  altitude  is -22.8 deg. 

The galactic latitude b = -19 deg., longitude l = 280 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1562923

We obtain a following upper limits.  

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

      60 |         MASTER-OAFA |   C |    10 | 17.1 |        
      94 |         MASTER-OAFA |   C |    20 | 17.5 |        
     134 |         MASTER-OAFA |   C |    20 | 17.5 |        
     243 |         MASTER-OAFA |   C |    40 | 14.4 |        
     376 |         MASTER-OAFA |   C |    70 | 18.1 |        
Filter C is a clear (unfiltred) band. 


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