TITLE:   GCN CIRCULAR
NUMBER:  16009
SUBJECT: GRB 140320C: MASTER optical observations
DATE:    14/03/20 15:12:11 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, M. Pruzhinskaya, D.Denisenko, V.Kornilov, N.Tyurina, 
P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Kuvshinov
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.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  GRB140320C (Mereghetti et. 
al GCN 16007) 25 sec after notice time and 33 sec after trigger time at 2014-03-20 13:18:13 UT in two 
polarizations. We haven`t found optical 
transient  within INTEGRAL error-box  on single and coadd images.
The 5-sigma upper limit has been about 16.8 mag on first single 10 sec 
image.
On coadd of 11 first images with different exposures and total exosure 
time 610 sec the 5-sigma upper limit has been about 20.0 mag in bosh 
polarization.

The message may be cited.