GCN Circular 11185

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
Sternberg Astronomical Institute, Moscow State University

V.Krushinski, I.Zalozhnich, T.Kopytova, 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


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



MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located at Ural (Kourovka)  was pointed to the
Swift GRB 100902A (Sakamoto et al., GCN Circ 11181) 27  sec  after Notice time 
(104 s after trigger time) in two polarizations.

Thre is no optical transient at XRT position (Sakamoto et al., GCN Circ 1118) 
with next limits:

start UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd? Filter
--------------------------------------------------------------------------
19:33:38       19:33:58     20        17.0      104.0          N  Polariz
19:34:12       19:34:42     30        17.3      132.0          N  Polariz
19:34:57       19:35:57     40        17.3      177.0          N  Polariz
19:35:51       19:36:41     50        17.4      231.0          N  Polariz
19:33:38       19:36:41    140        18.0      104.0          Y  Polariz
--------------------------------------------------------------------------

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mailto: lipunov@sai.msu.ru