TITLE:   GCN CIRCULAR
NUMBER:  11908
SUBJECT: GRB 110407A: MASTER optical observations 
DATE:    11/04/08 15:16:15 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>

V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina
Blagoveschensk Educational State University, Blagoveschensk

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

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

V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov
Ural State University, Kourovka

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

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in 
Blagoveschensk was pointed to the  GRB110407   25 sec  after notice time and 
107 sec after GRB time at 2011-04-07 14:08:28.65 UT. On our first (20s 
exposure) set we haven`t found optical transient  within SWIFT-BAT 
error-box up to 17.8 mag (5 sigma unfiltered)(Yurkov et al., GCN Circ No 
11897).

The results of the follow observations are:

T_mean-Tgrb [s]   Tstart 	   exptime   3 sigma-mlimit    Coadd
     209          14:08:28           200            19.7       5
    1143   	 14:14:03          1220            21.3      10
    2341 	 14:14:03          3380            22.0      22
    3640  	 14:14:03          5720            22.5      35

There is no OT at the Lulin position (Chuang et al., GCN Circ 11899)


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