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GCN Circular 31274

Subject
Swift GRB 211221A: Global MASTER-Net observations report
Date
2021-12-22T00:56:25Z (2 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, 
D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina,
A.Chasovnikov, V.Topolev, V.Grinshpun, 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
(Irkutsk State University, API),

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

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


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 211221A ( K. L. Page et al., GCN 31273Not found
 
 
) errorbox  3401 sec after notice time and 3560 sec after trigger time at 2021-12-21 21:48:01 UT, with upper limit up to  14.8 mag. The observations began at zenith distance = 46 deg. The sun  altitude  is -68.8 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB 211221A errorbox  13726 sec after notice time and 13885 sec after trigger time at 2021-12-22 00:40:06 UT, with upper limit up to  16.7 mag. Observations started at twilight.  The observations began at zenith distance = 54 deg. The sun  altitude  is -12.1 deg. 

The galactic latitude b = -20 deg., longitude l = 201 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1823335

We obtain a following upper limits.  

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

    3651 |   MASTER-Kislovodsk |   C |   180 | 12.7 |        
    3651 |   MASTER-Kislovodsk |   C |   180 | 12.2 |        
    3851 |   MASTER-Kislovodsk |   C |   180 | 13.0 |        
    3851 |   MASTER-Kislovodsk |   C |   180 | 13.4 |        
    4052 |   MASTER-Kislovodsk |   C |   180 | 14.2 |        
    4052 |   MASTER-Kislovodsk |   C |   180 | 14.2 |        
    4252 |   MASTER-Kislovodsk |   C |   180 | 14.8 |        
    4252 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
    4453 |   MASTER-Kislovodsk |   C |   180 | 14.4 |        
    4453 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
   10415 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
   10896 |   MASTER-Kislovodsk |   C |   180 | 13.8 |        
   10896 |   MASTER-Kislovodsk |   C |   180 | 14.4 |        
   11497 |   MASTER-Kislovodsk |   C |   180 | 13.4 |        
   11497 |   MASTER-Kislovodsk |   C |   180 | 13.1 |        
   11897 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
   12787 |   MASTER-Kislovodsk |   C |   180 | 14.1 |        
   12787 |   MASTER-Kislovodsk |   C |   180 | 14.1 |        
   13976 |         MASTER-OAFA |   C |   180 | 16.7 |        
Filter C is a clear (unfiltred) band. 


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