[vsnet-grb-info 17035] GRB 150915A: MASTER-NET optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18316
SUBJECT: GRB 150915A: MASTER-NET optical observations 
DATE:    15/09/15 22:38:43 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 (Tenerife, Spain) was pointed to the  GRB150915A 22 sec 
after notice time and 95 sec after trigger time at 2015-09-15 21:20:03 UT 
in two polarizations. On our first single  (20s exposure) and coadd  (760s 
exposure)  sets we haven`t found optical transient  within SWIFT error-box 
(Elia et al. GCN 18315).
The 5-sigma upper limit has been about 17.3 on single and 19.8 on coadd 
image.

MASTER II  robotic telescope located in SAAO (South Africa) was pointed to 
the  GRB150915A 25 sec after notice time and 100 sec after trigger time at 
2015-09-15 21:20:07 UT in two polarizations. On our first (20s exposure) 
set we haven`t found optical transient  within SWIFT error-box .
The 5-sigma upper limit has been about 17.2 mag

The message may be cited.