[vsnet-grb-info 7035] GRB081203A: MITSuME optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8619
SUBJECT: GRB081203A: MITSuME optical observation
DATE:    08/12/05 11:04:48 GMT
FROM:    Michitoshi Yoshida at Okayama Astrophysical Obs  <yoshida at oao.nao.ac.jp>

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

We performed optical imaging observation of the field of GRB 081203A
(Parsons, et al., GCN Circ. 8595) with the 3-color 50cm MITSuME
Telescopes at Akeno Observatory and Okayama Astrophysical Observatory
from UT 17:50 to UT 20:55, 3.9 hours after the trigger.

In the co-added images of Rc, and g' bands, we detected the optical
afterglow detected with UVOT (Parsons, et al., GCN Circ. 8595).
Photometric calibration was done using the GSC2.3 catalogs.
The results are following:

Akeno:
MID-MJD      MID-UT    EXP-T        g'            Rc
----------------------------------------------------------
54803.753779 18:12:54  1620.0  18.50+/-0.24  18.11+/-0.25
----------------------------------------------------------

Okayama:
MID-MJD      MID-UT    EXP-T        g'            Rc
----------------------------------------------------------
54803.790960 18:58:59  1500.0  18.87+/-0.26  18.36+/-0.19
54803.811830 19:29:03  1500.0  19.18+/-0.25  17.89+/-0.15
54803.833037 19:59:35  1560.0  19.11+/-0.23  18.49+/-0.24
54803.854522 20:30:31  1560.0  19.63+/-0.32  18.91+/-0.19
----------------------------------------------------------