[vsnet-grb-info 12054] GRB 120711A: MASTER early OT detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13443
SUBJECT: GRB 120711A: MASTER  early OT detection
DATE:    12/07/11 15:51:48 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)

D. Denisenko, A. Kuznetsov, V. Lipunov, E. Gorbovskoy, V. Kornilov, 
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
INTEGRAL TRIGGER_NUM 6599 = Fermi TRIGGER_NUM: 363667496
60 sec after INTEGRAL trigger Time (Gotz et al., GCN 13434, Gruber 
and Pelassa, GCN 13437) on 2012-07-11 at 02:45:54.107 UT.

Our cameras are continuously imaging the sky with 5 sec exposures.

On our first unfiltered image (5 sec exposure) we have not found any OT.
We see OT (Lacluyze et al., GCN 13430, Zheng et al., GCN 13432, Elliot et 
al., GCN 13438, Fugazza et al., GCN 13439 and Tanvir et al., GCN 13441)
on the sum of 4 images obtained between T0+121s and T0+141s with the
unfiltered magnitude 12.5. Nothing is visible at the OT position on 
the individual (m_lim = 12.0) and combined (m_lim=13.0) images obtained 
before T0+121s and after T0+141s.

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