TITLE:   GCN CIRCULAR
NUMBER:  18565
SUBJECT: GRB 151107A: MASTER-NET optical observations
DATE:    15/11/07 19:56:02 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

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

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

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

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

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

V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
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-SAAO  robotic telescope (MASTER-Net: http://observ.pereplet.ru), 
located in SAAO, received Swift  GRB 151107A at the sunset, when the Sun 
altitude was -3.4 degrees, GRB altitude was 18.4 degrees.

MASTER-SAAO was pointed to the  GRB151107A 1750 sec after notice time 
and 2141 sec after trigger time at 2015-11-07 17:55:20 UT (Sun Altitude: 
-10.34, Alert altitude: 14.75). On our images (180s exposure)  we haven`t 
found optical transient  within SWIFT error-box (ra=14 28 33 dec=-59 40 46 
r=0.05). The 5-sigma upper limit has been about 17.2mag. There is  a 
bright star near the BAT coordinates. GRB is setting.

The best single image was started at  	2015-11-07 18:49:45 	(exp 180) 
m_lim = 18.3 mag.
The message may be cited.