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GCN Circular 19704

Swift Trigger 704327: MASTER syncronous optical observations
2016-07-14T11:55:23Z (8 years ago)
Vladimir Lipunov at Moscow State U/Krylov Obs <>
E.S. Gorbovskoy,  V. Lipunov,   N.Tyurina, V.Kornilov,
P.Balanutsa,  A.Kuznetsov, D.Kuvshinov,
Lomonosov Moscow State University, Sternberg Astronomical Institute

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

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

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

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

Ricardo Podesta, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)

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

MASTER II  robotic telescope (MASTER-Net: 
located in IAC was pointed to the possible GRB (Swift Trigger 704327, 
Sbarufatti et al.,  GCN 19700)  25 sec after notice time and 71 sec after 
trigger time at 2016-07-14 05:22:17 UT at two polarizations in a morning 
twinlight (sun altitude -11 d). The 5-sigma upper limit has been about 
16.0 mag on first single  (10 sec exposure) and  17.8 mag on coadd (290 
sec exposure) images. Not very deep upper limits are explained by the 
observation in the twilight.

We marginaly seen possible OT first images at 2 sigma level.

Ra   =  18 10 27.49
Dec =  +72 03 50.6
Mag =  16.0 +- 0.5

MASTER-IAC wide field camera  continiously observed Swift BAT error box 
before, during and after thigger with 5 sec unfiltered exposition. The 
5-sigma upper limit has been about 10.5 on each 5 second exposure image. 
We haven`t found optical transient  within Swift BAT error-box on this 

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