[vsnet-grb-info 12329] GRB 120830A: early MASTER optical limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13706
SUBJECT: GRB 120830A: early MASTER optical limit
DATE:    12/08/31 09:07:25 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc at observ.inetcomm.ru>

H. Levato and C. Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

C. Mallamaci, C. Lopez and F. Podest
Observatorio Astronomico Felix Aguilar (OAFA)

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

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

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

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

V. Krushinski, I. Zalozhnich,  A. Popov, A. Bourdanov, A. Punanova
Ural Federal University


MASTER-ICATE robotic very wide field cameras (FOV=2x384 square degrees, D=72mm, 
f/1.2, 1 pix = 22 arcsec, http://observ.pereplet.ru) located in Argentina 
(Observatorio Astronomico Felix Aguilar, http://93.180.27.230:8080/) were 
pointed to the FERMI GRB120830A (Vianello et al., GCN 13704) 18 s after 
notice time and 44 s after GRB time at 2012-08-30 07:07:47 UT(Levato et al., GCN 13703).
We cover IPN (Hurley et al., GCN 13705) and Fermi LAT error boxes.

We haven`t found  optical transient on our first (5 s 
exposure) set and on coadd image made of 60 images and complete exposure of 300 
seconds.
The coverage map is available 
http://master.sai.msu.ru/static/GRB120830A_IPN_LAT.jpeg

The 5-sigma upper limit on single image has  been about 11.0 mag and 12.0 mag 
on coadd image.
Our cameras are continuously imaging the sky with 5 sec exposures.
Weather conditions were not so good (feeble cloudiness).
This message can be cited.