[vsnet-grb-info 8758] GRB 091208B: MITSuME Okayama Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10258
SUBJECT: GRB 091208B: MITSuME Okayama Optical Observation
DATE:    09/12/08 12:06:40 GMT
FROM:    Michitoshi Yoshida at Okayama Astrophysical Obs  <yoshida at oao.nao.ac.jp>

M. Yoshida, D. Kuroda, K. Yanagisawa, Y. Shimizu, S. Nagayama,
H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf
of the MITSuME collaboration:

We observed the field of GRB 091208B (Pagani et al., GCN 10256)
with the optical three color (g', Rc and Ic) CCD camera attached
to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started at 09:57:03 2009-12-08 UT, 426s after the
trigger. We detected the optical afterglow previously reported
by de Ugarte Postigo et al. (GCN 10255) and Pagani et al. (GCN
10256) in all the three bands.

The preliminary photometry results of the OT are listed below. We
used GSC2.3 catalog for flux calibration.


#PDAY    MID-UT    T-EXP       g'            Rc            Ic
------------------------------------------------------------------
0.00855  10:02:17  540.0  18.4 $B!^(B 0.2  17.6 $B!^(B 0.1  17.0 $B!^(B 0.2
0.01615  10:13:14  540.0  18.5 $B!^(B 0.2  18.1 $B!^(B 0.2  17.4 $B!^(B 0.2
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