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GCN Circular 11791

GRB 110315A: MASTER early optical observations
2011-03-16T09:37:25Z (13 years ago)
Vladimir Lipunov at Moscow State U/Krylov Obs <>
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina,
D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov,
D.Zimnukhov, M. Kornilov, A.V.Krylov, V.Shumkov, S.Shurpakov
Sternberg Astronomical Institute, Moscow State University

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

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

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

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

MASTER II  robotic telescope (MASTER-Net: 
located in Kislovodsk was pointed to the GRB110315A (Melandri et al., GCN 
11790) 44 sec s 
after notice time and 89 sec after GRB time at 2011-03-15 23:58:33.212 UT.
On our first (20s exposure) set we haven`t found optical transient  within 
SWIFT BAT error-box (ra=18 36 45 dec=+17 31 48 ).
The 3-sigma upper limit has been about 17.3 mag
The upper limit for 25 coadded images is 20.0 started 23:58:33.212 UT 
(mean time after trigger is 3240 sec ). 
The Galactic absroption in this direction is about 1 mag (Kalbela et al., 
2005, A&A,440,775).

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