[vsnet-grb-info 13653] Fermi GBM trigger 394416326: MASTER early optical limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14970
SUBJECT: Fermi GBM trigger 394416326: MASTER early optical limit
DATE:    13/07/03 16:24:15 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, D. Denisenko, V. Lipunov,  V. Kornilov,  A. Kuznetsov,
D. Kuvshinov, 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
Fermi-GBM trigger 394416326 55 sec after GRB time and 49 sec FERMI trigger 
Time  at 2013-07-02 00:06:18 UT.
We haven't found optical transient (Singer et. al. GCN 14967) on single 
(exp = 5 sec) images with upper limit V<11m and coadded image made of 
first 58 frames (5 sec exposure without time gap) and total exposure of
290 seconds with upper limit V<12.5m. Our magnitudes are calibrated 
against V magnitudes from Tycho-2 catalog.

This upper limit does not contradict the power law decay with an index of 
0.54 inferred by Singer et al. in GCN 14967.

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