[vsnet-grb-info 17019] GRB 150912A: MASTER-IAC optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18300
SUBJECT: GRB 150912A: MASTER-IAC optical observations 
DATE:    15/09/12 22:30:37 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

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

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

K.Ivanov, O.Gres, N.M.Budnev, S.Yazev,
Irkutsk State University

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

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

V.Krushinski, I.Zalozhnih
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 IAC  was pointed to the  GRB150912A 33865 sec (9.4 h) after 
trigger time at 2015-09-12 20:01:55 UT directly after the sunset. On our 
first single and coadd sets we haven`t found optical transient  within IPN 
error-box (Mereghetti et. al GCN 18291).
The 5-sigma upper limit has been about 19.2 on single (180 sec) and ~ 20.3 
at coadd (10x180 sec) images.
The message may be cited.