TITLE:   GCN CIRCULAR
NUMBER:  11178
SUBJECT: GRB 100901A: MASTER optical flare at 420s discovery
DATE:    10/09/02 18:20:57 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>

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


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

V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina
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, T.Kopytova, A. Popov
Ural State University, Kourovka


We  (MASTER-Net: http://observ.pereplet.ru, Tunka, Ivanov et al., 
GCN Circ 11161) clearly detected optical flare   (maxmag~17.0,unfiltered) at 426+-40 s   after 
trigger time (Immler et al., GCN Circ 11159)  synchronously  with 
Xray flare  (Page et al.,  GCN Circ 11171).

We have ~ 11 hours Unfiltered, R,I, Polarization continuously 
observations on same telescope systems. The redaction is continued.

The first 10 000 s relative optical flux light curve  is 
available at http://observ.pereplet.ru/images/GRB100901A/opt_flux_lc.png


The message may be cited.

mailto: lipunov@sai.msu.ru