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GCN Circular 24236

Subject
LIGO/Virgo S190426c Global MASTER-Net observations report
Date
2019-04-26T16:39:46Z (6 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-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo S190426c errorbox  3232 sec after trigger time at 2019-04-26 16:15:47 UT, with upper limit up to  18.4 mag. The observations began at zenit distance = 117 deg. The sun  altitude  is -25.7 deg. 

MASTER-Tunka robotic telescope  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the LIGO/Virgo S190426c errorbox  3803 sec after trigger time at 2019-04-26 16:25:18 UT, with upper limit up to  19.5 mag. The observations began at zenit distance = 125 deg. The sun  altitude  is -24.9 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/ligo_1.php?id=10199

We obtain a following upper limits.  

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

    3323 | 2019-04-26 16:15:47 |         MASTER-Amur | (  2h 50m 29.91s , +85d 53m 31.28s) |   C |   180 | 18.3 |        
    3556 | 2019-04-26 16:19:40 |         MASTER-Amur | ( 14h 14m 37.41s , +85d 56m 38.95s) |   C |   180 | 18.1 |        
    3768 | 2019-04-26 16:23:13 |         MASTER-Amur | (  0h 25m 31.78s , +85d 27m 16.37s) |   C |   180 | 18.4 |        
    3893 | 2019-04-26 16:25:18 |        MASTER-Tunka | ( 22h 27m 30.53s , +83d 55m 49.49s) |   C |   180 | 19.5 |        
Filter C is a clear (unfiltred) band. 


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