[vsnet-grb-info 11318] GRB111225A: MITSuME Okayama optical upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12730
SUBJECT: GRB111225A: MITSuME Okayama optical upper limits
DATE:    11/12/26 02:09:16 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 (Siegel et al., GCNC 12720)
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 2011-12-25 09:00:08 UT (~5.2 hours
after the burst). We did not find any new point source within the
enhanced XRT error circle (Evans et al., GCNC 12724) and could not
detect the previously reported afterglow (Klotz et al., GCNC 12722;
Updike et al., GCNC 12723) in g' and Ic bands.

Three sigma upper limits of the OT are listed below. We used
GSC2.3 catalog for flux calibration.

T0+[day]   MID-UT   T-EXP[sec]    g'     Ic
------------------------------------------------------
0.25569    09:58:49  5700.0     >20.2  >19.6
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]