TITLE:   GCN CIRCULAR
NUMBER:  15536
SUBJECT: GRB 131128A: MASTER-Net  optical observations
DATE:    13/11/28 16:59:35 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>

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

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


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.Krushinsky, I.Zalozhnih,  A. Popov
Ural Federal University, Yekaterinburg, 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  GRB131128.63 12 sec  after 
notice time and 315 sec after GRB time at 2013-11-28 15:11:39.707 UT. On 
our first (60s exposure) set we haven`t found optical transient  within 
XRT SWIFT error-box.

There is bright star near XRT position USNO-A2.0 1200-19996598 R_mag ~ 12.
The 5-sigma upper limit has been about 17.1 mag.
We do not see OT at the Nanshan afterglow candidate position (Xu et al., 
GCN15535). 
The message may be cited.