[vsnet-grb-info 13164] GRB 130425: MASTER-Net optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14501
SUBJECT: GRB 130425: MASTER-Net optical observations
DATE:    13/04/29 12:59:52 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://master.sai.msu.ru:8080/) were pointed to the
GRB 130425A (von Kienlin, GCN 14442, K. Hurley et. al GCN 14446, S. 
Golenetskii et. al 14447) 40 sec after FERMI trigger Time  at 2013-04-25 
07:52:08 UT. We cover full IPN error box (K. Hurley et. al GCN 14446).

We haven't found optical transient within IPN error box on our 5-s
frames and on the coadded image made of 60 frames and total exposure of 
300 seconds. The 3-sigma upper limit (with the reference to V magnitudes 
from Tycho-2 catalog) has been about 11.0 mag on single images and 13.0 
mag on coadded image.

The coverage map available here:
http://master.sai.msu.ru/static/MASTER_ARG_GRB130425A_single.jpeg

The reduction of the whole data set is continuing.
This message can be cited.