[vsnet-grb-info 11331] GRB111228A: MITSuME Okayama Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12743
SUBJECT: GRB111228A: MITSuME Okayama Optical Observation
DATE:    11/12/28 21:50:56 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 111225A (Ukwatta et al., GCNC 12737)
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 2011-12-28 15:47:03 UT (~2.3 min after
the burst). We detected the previously reported afterglow
(Ukwatta, GCNC 12737; Xin et al., GCNC 12738) in all the three bands.


Photometric results and are listed below. We used SDSS catalog for
flux calibration.

#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err   Rc  Rc_err   Ic  Ic_err
----------------------------------------------------------------------
0.00511    15:52:04     540.0   17.45  0.06  17.13  0.05   16.52  0.05
----------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]