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GCN Circular 30249

Subject
Swift GRB210618.07: Global MASTER-Net observations report
Date
2021-06-18T01:54:19Z (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-IAC robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Spain (IAC Teide Observatory) was pointed to the Swift GRB210618.07 (trigger No 1056426,15h 43m 16.80s , +46d 02m 34.8s, R=0.05) errorbox  14 sec after notice time and 41 sec after trigger time at 2021-06-18 01:44:18 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 37 deg. The sun  altitude  is -37.7 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB210618.07 errorbox  28 sec after notice time and 56 sec after trigger time at 2021-06-18 01:44:33 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 77 deg. The sun  altitude  is -51.4 deg. 

The galactic latitude b = 51 deg., longitude l = 73 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1639424

We obtain a following upper limits.  

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

      47 |          MASTER-IAC |  P| |    10 | 16.6 |        
      61 |         MASTER-OAFA |   C |    10 | 16.5 |        
      76 |         MASTER-OAFA |   C |    40 | 17.4 |  Coadd 
      67 |          MASTER-IAC |  P| |    10 | 16.6 |        
      92 |          MASTER-IAC |  P| |    20 | 17.3 |        
      91 |         MASTER-OAFA |   C |    10 | 16.6 |        
     122 |          MASTER-IAC |  P| |    20 | 17.3 |        
     133 |         MASTER-OAFA |   C |    20 | 17.0 |        
     159 |          MASTER-IAC |  P| |    30 | 17.6 |        
     178 |         MASTER-OAFA |   C |    30 | 17.3 |        
     205 |          MASTER-IAC |  P| |    40 | 18.0 |        
     233 |         MASTER-OAFA |   C |    40 | 17.4 |        
     260 |          MASTER-IAC |  P| |    50 | 18.2 |        
     297 |         MASTER-OAFA |   C |    50 | 17.5 |        
Filter C is a clear (unfiltred) band. 


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