TITLE:   GCN CIRCULAR
NUMBER:  17967
SUBJECT: GRB 150626B: MASTER observations
DATE:    15/06/26 21:27:43 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

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

Rafael Rebolo, Miquel 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

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

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

V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A.Gabovich
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)

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Kislovodsk was pointed to the  GRB150626B 216 sec after notice 
time and 260 sec after trigger time at 2015-06-26 20:27:12 UT in two 
polarizations, directly after automatic weather control system give permit 
for observations. On our first (50s exposure)  set we not found  optical 
transient within SWIFT error-box (McCauley et al. GCN 17966) brighter then 
17.5.
The 5-sigma upper limit has been about 17.5 mag


MASTER-IAC  pointed to the  GRB150626B  46   sec after notice time and 90 
sec after trigger time at 2015-06-26 2015-06-26 20:24:22 UT, but the 
images overexposed due to eveninig sky (Sun alt -4 deg.).

The observations is continued.
The message may be cited.