TITLE:   GCN CIRCULAR
NUMBER:  13216
SUBJECT: GRB 120402B: MASTER early OT limit
DATE:    12/04/04 16:56:24 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>

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

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

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

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

V.Krushinski, I.Zalozhnich,  A. Popov
Ural State 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 robotic Very Wide Field Cameras    (MASTER: http://observ.pereplet.ru) 
located in Tunka was pointed to the  FERMI GRB 120402B (Collazzi, 
GCN 13194) 64 sec after GRB time at 2012-04-02 16:05:04.583 UT.
On our first (10s exposure) set we haven`t 
found optical transient  within FERMI error-box (RA = 223.7, Dec = -10.4, 
Rad=9 degrees (3 sigma + 3 deg. of systematic error ) .
The MASTER VWF cameras cover full 1 sigma (+ 3 deg. sys. error) 
error box and ~ 95% 3 sigma  (+ 3 deg. sys. error) error box.
The unfiltered upper limit is 12.0 mag.


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