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GCN Circular 24294

Subject
Fermi GRB190427.19 Global MASTER-Net observations report
Date
2019-04-27T18:17:03Z (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-Tunka robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB190427.19 ( 18h 10m 04.08s , +46d 49m 58.80s, R=3.5) errorbox  45378 sec after trigger time at 2019-04-27 17:10:33 UT, with upper limit up to  19.8 mag. The observations began at zenit distance = 36 deg. The sun  altitude  is -25.2 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=1004400

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   45468 | 2019-04-27 17:10:33 |        MASTER-Tunka | ( 17h 57m 43.43s , +46d 10m 42.11s) |   C |   180 | 19.4 |        
   45468 | 2019-04-27 17:10:33 |        MASTER-Tunka | ( 18h  7m 26.47s , +45d 59m 55.38s) |   C |   180 | 19.8 |        
   46124 | 2019-04-27 17:21:29 |        MASTER-Tunka | ( 17h 57m 41.81s , +46d 10m 55.77s) |   C |   180 | 19.2 |        
   46124 | 2019-04-27 17:21:29 |        MASTER-Tunka | ( 18h  7m 25.60s , +46d  0m 08.49s) |   C |   180 | 19.8 |        
   46415 | 2019-04-27 17:26:19 |        MASTER-Tunka | ( 17h 57m 42.87s , +46d 11m 01.93s) |   C |   180 | 19.4 |        
   46415 | 2019-04-27 17:26:19 |        MASTER-Tunka | ( 18h  7m 26.54s , +46d  0m 14.87s) |   C |   180 | 19.8 |        
Filter C is a clear (unfiltred) band. 


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