[vsnet-grb-info 17897] GRB 160425A : MASTER earlier optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19344
SUBJECT: GRB 160425A : MASTER earlier optical observations
DATE:    16/04/26 00:25:58 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy,   N.Tyurina, V.Kornilov, P.Balanutsa, A.Kuznetsov, 
D.Kuvshinov
Lomonosov Moscow State University, Sternberg Astronomical Institute

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

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

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

V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk

V.Krushinski, I.Zalozhnih,  A. Popov
Ural Federal University, Kourovka

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

Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)

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

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in SAAO was pointed to the  GRB 160425A (trigger time 23:26:11.34) 
at 2016-04-25 23:28:59UT.
On our first (30s, t_start=2016-04-25 23:28:59UT, m_lim=17.3, 
polarization)  exposition there is 
marginally seen optical transient  within 
SWIFT error-box up (H. A. Krimm et al., GCN #19343) at 
RA=280.32738,-54.36004

The observations will be continued.