GCN Circular 11328

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


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

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-Net robotic telescopes (MASTER-Net: http://observ.pereplet.ru)
located  near Ekaterinburg (Kourovka)  and Tunka (Baykal Lake) was pointed 
to the Swift GRB 101008A (Baumgartner et al., GCN#11318, GCN#11319; 
Beardmore et al., GCN#11321) 53 s after trigger time (immediately after 
roof opening and with last night focus) and 8309s after trigger time (the 
Tunka delay was due to weather conditions).

Time duration of the  GRB 101008A is 104 +- 35 sec (Barthelmy et al., 
GCN#11327). So we have prompt optical limit at Kourovka site.
We see marginaly possible OT (S2,  Moskvitin et al.,GCN#11324; Nardini et 
al., GCN#11326) at Tunka observations.

We have next unfiltered estimation:

t_start-t_trig(s)   mean time     exp_time(s)     m             Coadd? 
Site
--------------------------------------------------------------------------
       53            58    10         >14.5        N             Kourovka
       53           141   410         >16.0        Y             Kourovka
     8309         10260   540       19.5+-1.0      Y             Tunka
--------------------------------------------------------------------------
MASTER II have 2 images per exposition time.
The message may be cited.

mailto: lipunov@sai.msu.ru