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GCN Circular 24263

Subject
Swift GRB190427.19 Global MASTER-Net observations report
Date
2019-04-27T05:31:26Z (5 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa,
A.Kuznetsov, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University

A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory

K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk
Irkutsk State University

V. Yurkov, A. Gabovich, Yu. Sergienko
Blagoveschensk Educational State University, Blagoveschensk

R. Podesta, Carlos Lopez and F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)

Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias

D. Buckley, S. Potter, A. Kniazev, M. Kotze
South African Astronomical Observatory



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 GRB190427.19 ( 18h 40m 51.12s , +40d 19m 19.20s, R=0.05) errorbox  40 sec after trigger time at 2019-04-27 04:34:54 UT, with upper limit up to  18.6 mag. The observations began at zenit distance = 16 deg. The sun  altitude  is -23.5 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB190427.19 errorbox  44 sec after trigger time at 2019-04-27 04:34:58 UT, with upper limit up to  13.2 mag. Observations started at twilight.  The observations began at zenit distance = 75 deg. The sun  altitude  is -7.5 deg. 

The galactic latitude b = -60 deg., longitude l = 98 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1004408

We obtain a following upper limits.  

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

      45 |          MASTER-IAC |  P- |    10 | 16.8 |        
      45 |          MASTER-IAC |  P| |    10 | 17.1 |        
      50 |         MASTER-SAAO |  P\ |    10 | 13.3 |        
      77 |         MASTER-SAAO |  P\ |    10 | 13.2 |        
     100 |          MASTER-IAC |  P- |    20 | 17.4 |        
     100 |          MASTER-IAC |  P| |    20 | 17.6 |        
     108 |         MASTER-SAAO |  P\ |    20 | 13.1 |        
     160 |          MASTER-IAC |  P- |    30 | 17.7 |        
     160 |          MASTER-IAC |  P| |    30 | 17.9 |        
     212 |          MASTER-IAC |  P- |    40 | 17.9 |        
     212 |          MASTER-IAC |  P| |    40 | 18.2 |        
     274 |          MASTER-IAC |  P- |    50 | 18.1 |        
     274 |          MASTER-IAC |  P| |    50 | 18.3 |        
     346 |          MASTER-IAC |  P- |    60 | 18.3 |        
     346 |          MASTER-IAC |  P| |    60 | 18.6 |        


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