GCN Circular 10052
Subject
GRB 091020: MASTER optical transient polarimetry
Date
2009-10-21T05:15:37Z (15 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
E. Gorbovskoy,D.Kuvshinov, V. Lipunov, V.Kornilov, D.Kuvshinov,
A.Belinski, A. Krylov, N.Shatskiy, N.Tyurina, P.Balanutsa, V.V.Chazov,
Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parkhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalognikh, T.Kopytova, A. Popov
Ural State University, Kourovka
S.Yazev, K.Ivanov, N.M.Budnev
Irkutsk State University
V.Yurkov
Blagoveschensk Educational State University, Blagoveschensk
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru, 2x400
mm, 8 square degrees, 2x16Mpx Apogee CCD) located
at Kislovodsk was pointed to the GRB 091020 (Racusin et al., GCN 10048)
by internet 3422 s after the GRB time. The
large delay was caused with technical problems on site.
We see bright optical counterpart (~17.5 mag) on the firrst images at UVOT
position.
We have 130 images with 180 sec synchronous exposition each and 19.5
magnitude limit during ~4 hours in two polarization.
The power low decay with alpha ~= 1.3 during 2.5 hours is observed.
This is the preliminary result.
The reduction is continued.
The message may be cited.
mailto: lipunov@sai.msu.ru