[vsnet-grb-info 8305] GRB 090820: MASTER-Net optical polarization observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Fri Aug 21 01:36:02 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 9830
SUBJECT: GRB 090820: MASTER-Net optical polarization observations
DATE: 09/08/20 16:35:57 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc at 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
Sternberg Astronomical Institute, Moscow State University
K.Ivanov, S.Yazev
Irkutsk State University
A. Tlatov, A.V. Parhomenko,
Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalognih, T.Kopytova
Ural State University, Kourovka
There are 6 MASTER Very Wide Field cameras located at Kislovodsk and Irkutsk
with common FOW = 2000 + 1680 square degrees (http://observ.pereplet.ru/).
Four MASTER Very Wide Field Cameras located at Kislovodsk
(4 Carl Zeiss Planar T* 85/1.4 ZF, 4x420 square degrees, 11 Mpx, 22" per
pix with 4 polarizers) responded to
the bright GRB 090820 (Fermi TRIGGER_NUM:272421498, V. Connaughton, GCN
9829), producing images beginning 9 s after the GRB Time (first alert notice).
We took 1300 images with 5 sec exposition in different polarizations.
Individual images have limiting magnitudes~11.
Our unfiltered images are calibrated relative to Tycho stars (V) and very close
to V band.
Other observations are required for independ error box elaboration.
The reduction is continued.
The message may be cited.
mailto: lipunov at sai.msu.ru
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