[vsnet-grb-info 9772] GRB100906A: MITSuME Okayama Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11240
SUBJECT: GRB100906A: MITSuME  Okayama Optical Observation
DATE:    10/09/07 00:06:52 GMT
FROM:    Daisuke Kuroda at OAO/NAOJ  <dikuroda at oao.nao.ac.jp>

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

We observed the field of GRB 100906A (Markwardt et al., GCN 11227)
with the optical three color (g', Rc and Ic) CCD camera attached
to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.

The observation started on 2010-09-06 13:53:54 UT (~4.4 min after
the burst).  We detected the previously reported afterglow
(Markwardt et al., GCN 11227; Ivanov et al., GCN 11228; Melandri
et al., GCN 12229) in all the three bands.

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

#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err   Rc  Rc_err   Ic  Ic_err
----------------------------------------------------------------------
0.00662    13:58:60     540.0   15.58  0.04  14.42  0.02  14.00  0.02
0.01784    14:15:09     540.0   16.52  0.05  15.35  0.03  14.98  0.04
----------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]