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GCN Circular 30847

Subject
Swift GRB 210919A: Global MASTER-Net observations report
Date
2021-09-19T01:48:24Z (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-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 GRB 210919A ( A. Tohuvavohu et al., GCN 30846Loading...
 
 ) errorbox 47 sec after trigger time at 2021-09-19 00:29:20 UT, with upper limit up to  18.6 mag. The observations began at zenith distance = 61 deg. The sun  altitude  is -49.0 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 210919A errorbox  363 sec after notice time and 790 sec after trigger time at 2021-09-19 00:41:44 UT, with upper limit up to  14.3 mag. The observations began at zenith distance = 50 deg. The sun  altitude  is -24.1 deg. 

The galactic latitude b = -19 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=1725958

We obtain a following upper limits.  

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

      52 |         MASTER-SAAO | P\  |    10 | 16.1 |        
      67 |         MASTER-SAAO | P\  |    40 | 17.0 |  Coadd 
     397 |         MASTER-SAAO | P\  |   700 | 18.4 |  Coadd 
      77 |         MASTER-SAAO | P\  |    10 | 16.4 |        
     103 |         MASTER-SAAO | P\  |    20 | 16.6 |        
     141 |         MASTER-SAAO | P\  |    30 | 16.0 |        
     176 |         MASTER-SAAO | P\  |   100 | 16.6 |  Coadd 
     183 |         MASTER-SAAO | P\  |    30 | 14.7 |        
     230 |         MASTER-SAAO | P\  |    40 | 16.4 |        
     288 |         MASTER-SAAO | P\  |    50 | 15.9 |        
     358 |         MASTER-SAAO | P\  |   190 | 16.6 |  Coadd 
     355 |         MASTER-SAAO | P\  |    60 | 15.1 |        
     437 |         MASTER-SAAO | P\  |    80 | 16.4 |        
     541 |         MASTER-SAAO | P\  |   100 | 17.8 |        
     676 |         MASTER-SAAO | P\  |   370 | 18.6 |  Coadd 
     662 |         MASTER-SAAO | P\  |   120 | 17.8 |        
     810 |         MASTER-SAAO | P\  |   150 | 18.1 |        
     871 |   MASTER-Kislovodsk |  P| |   160 | 14.2 |        
     987 |         MASTER-SAAO | P\  |   180 | 17.5 |        
    1167 |         MASTER-SAAO | P\  |   540 | 17.9 |  Coadd 
    1048 |   MASTER-Kislovodsk |  P- |   180 | 12.4 |        
    1048 |   MASTER-Kislovodsk |  P| |   180 | 14.1 |        
    1188 |         MASTER-SAAO | P\  |   180 | 17.4 |        
    1249 |   MASTER-Kislovodsk |  P- |   180 | 12.9 |        
    1249 |   MASTER-Kislovodsk |  P| |   180 | 14.2 |        
    1387 |         MASTER-SAAO | P\  |   180 | 17.4 |        
    1449 |   MASTER-Kislovodsk |  P- |   180 | 13.4 |        
    1449 |   MASTER-Kislovodsk |  P| |   180 | 14.3 |        
    1587 |         MASTER-SAAO | P\  |   180 | 17.4 |        
    1650 |   MASTER-Kislovodsk |  P- |   180 | 13.6 |        


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