TITLE:   GCN CIRCULAR
NUMBER:  15981
SUBJECT: GRB 140311C: MASTER before, during and after trigger optical observations 
DATE:    14/03/13 15:55:07 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


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


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

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

V.Krushinski, I.Zalozhnih,  A. Popov
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 Blagoveschensk was pointed to the  GRB140311C (M. Stanbro, 
GCN15977) 14 sec after 
notice time and 29 sec after trigger time at 2014-03-11 14:49:42.721 UT . 
On our first (10s exposure) set we haven`t found optical transient  within 
FERMI error-box (ra=12 47 02 dec=+58 49 46 FOV=2x4 square degrees).
The 5-sigma upper limit has been about 16.3 mag

MASTER II  robotic telescope located in Tunka was pointed to the
GRB140311C (M. Stanbro,GCN15977) 35 sec after trigger time at 2014-03-11 
14:49:48.874 UT.
On our first (10s exposure) set we haven`t found optical transient  within
FERMI error-box (ra=12 47 02 dec=+58 49 46 FOV=2x4 square degrees).
The 5-sigma upper limit has been about 16.0 mag.

We have done survey of the large area around initial error box up to ~18 
unfiletred magnitude which was begun in 15 minutes after GRB.

The GBM error box (M. Stanbro, GCN15977) completely observed by 4-th Very 
Wide Field Cameras (FOV = 4x380 square degrees) before, during and after 
GRB without time gap up to 11 unfiltered magnitude limit on each 5 sec 
image. The reduction is continued now.

The IPN is very desirable.

The covarege map is available at 
http://master.sai.msu.ru/static/GRB/GRB140311C_map.png . The elliptical 
region is the Fermi GBM 1 sigma+3 degrees systematic error box.

The message may be cited.