[vsnet-grb-info 7045] GRB081203A: Optical observations at Ishigaki

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8629
SUBJECT: GRB081203A: Optical observations at Ishigaki
DATE:    08/12/06 13:25:53 GMT
FROM:    Mizuki Isogai at NAOJ  <mizuki.isogai at nao.ac.jp>

M. Isogai (IAO, NAOJ) and N. Kawai (Tokyo Tech) report with support 
of MITuME collaboration:

We observed the field of GRB 081203A(Parsons, et al., GCN Circ. 8595) 
with the optical 3-color imager attached to the 105cm Murikabushi 
Telescope at Ishigakizima Astronomical Observatory in Japan from 
UT 19:52, 5.9 hours after the trigger.

In the co-added images of Ic, Rc, and g' bands, we detected a fading
point source and measured its magnitude. Photometric calibration was 
performed using the GSC2.3 catalogs. 
The results are following:

MID-MJD      MID-UT    EXP-T      g'             Rc           Ic
----------------------------------------------------------------------
54803.837345 20:05:46  720.0                              18.50+/-0.09
54803.837345 20:05:46  900.0  19.43+/-0.11  18.76+/-0.06
54803.847273 20:20:04  720.0  19.39+/-0.11  
54803.848363 20:21:38  900.0                18.83+/-0.06  18.49+/-0.08
54803.859451 20:37:36  900.0  19.57+/-0.11  18.96+/-0.06  18.67+/-0.09
54803.870356 20:53:18  900.0  19.77+/-0.11  18.94+/-0.07  18.72+/-0.10
54803.881257 21:09:00  900.0  19.71+/-0.12  19.04+/-0.07  18.71+/-0.10