[vsnet-grb-info 16152] GRB 150211A: MASTER early optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17433
SUBJECT: GRB 150211A: MASTER early optical observations
DATE:    15/02/11 12:03:20 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

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

E. Gorbovskoy, V. Lipunov,  M.Pruzhinskaya, V.Kornilov, D.Kuvshinov, 
N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, 
D.Denisenko, A.Sankovich
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University

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

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

V.Krushinsky, I.Zalozhnih,  A. Popov
Ural Federal University, Yekaterinburg, Kourovka

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

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 Tunka was pointed to the  GRB150211A 39 sec after notice time 
and 55 sec after trigger time at 2015-02-11 11:53:08 UT in two 
polarizations. On our first (10s exposure)  set we haven`t found optical transient  within SWIFT error-box 
(ra=16 59 25 dec=+55 22 58 r=0.050000).
The 5-sigma upper limit has been about 15.5 mag
The position hava a high (z~75d) zenith distance.
The observation and data reductions is continued.
The message may be cited.