TITLE:   GCN CIRCULAR
NUMBER:  15429
SUBJECT: GRB 131031A: MASTER  optical observation
DATE:    13/11/01 10:36:33 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>

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

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,  A.Sankovich
Sternberg Astronomical Institute, Moscow State University

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

V.Krushinski, I.Zalozhnih,  A. Popov
Ural Federal University, Kourovka

A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo 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 Blagoveschensk was pointed to the  GRB131031A 11 s after notice 
time  and 51 s after GRB time at 2013-10-31 11:34:23UT by FERMI trigger 
N404912015.
Using very wide field cameras (FOV=2x384 square degrees, D=72mm, f/1.2, 1 
pix = 22 arcsec), we cover Swirt  error box (Cummings et al. GCN15421).
The 5-sigma upper limit has been about 11 mag on single 5 sec image and 
12.5 on coaad of 12 continuously images with total exposure 60 sec.
On  40-cm  MASTER-II telescope with FOV 4 sq. degree look at a center 
of FERMI GBM error box  (ra=01 47 16 dec=+00 33 34 r=2.3) and not cover 
Swirt error box .

The message may be cited.