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GCN Circular 32074

Subject
Swift GRB220521.97: Global MASTER-Net observations report
Date
2022-05-21T23:28:44Z (3 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, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin
(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),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez 
(INAOE, Guillermo Haro Astrophysics Observatory),

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

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


MASTER-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB220521.97 (trigger No 1107466,18h 20m 47.28s , +10d 23m 02.4s, R=0.05) errorbox  13 sec after notice time and 33 sec after trigger time at 2022-05-21 23:20:54 UT, with upper limit up to  15.9 mag. The observations began at zenith distance = 35 deg. The sun  altitude  is -21.6 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB220521.97 errorbox  16 sec after notice time and 36 sec after trigger time at 2022-05-21 23:20:57 UT, with upper limit up to  17.4 mag. The observations began at zenith distance = 33 deg. The sun  altitude  is -19.7 deg. 

The galactic latitude b = 11 deg., longitude l = 39 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1980468

We obtain a following upper limits.  

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

      39 |      MASTER-Tavrida |  P\ |    10 | 15.4 |        
      41 |   MASTER-Kislovodsk |  P| |    10 | 16.4 |        
      61 |   MASTER-Kislovodsk |  P| |    50 | 17.4 |  Coadd 
      59 |   MASTER-Kislovodsk |  P| |    10 | 16.3 |        
      68 |      MASTER-Tavrida |  P\ |    10 | 15.5 |        
      77 |   MASTER-Kislovodsk |  P| |    10 | 16.2 |        
     100 |   MASTER-Kislovodsk |  P| |    20 | 17.1 |        
     103 |      MASTER-Tavrida |  P\ |    20 | 15.9 |        
     128 |   MASTER-Kislovodsk |  P| |    20 | 17.2 |        
     142 |      MASTER-Tavrida |  P\ |    20 | 15.9 |        
     161 |   MASTER-Kislovodsk |  P| |    30 | 17.2 |        
     204 |   MASTER-Kislovodsk |  P| |    40 | 17.4 |        
     257 |   MASTER-Kislovodsk |  P| |    50 | 17.2 |        


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