[vsnet-grb-info 9738] GRB100902A: Optical upper limits at IAO

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11206
SUBJECT: GRB100902A: Optical upper limits at IAO
DATE:    10/09/04 13:34:25 GMT
FROM:    Daisuke Kuroda at OAO/NAOJ  <dikuroda at oao.nao.ac.jp>

D. Kuroda (OAO, NAOJ),  H. Hanayama, T. Miyaji, J. Watanabe(IAO, NAOJ),
K. Yanagisawa (OAO, 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 100902A (Sakamoto et al. GCNC 11181)
with the optical three color (g', Rc and Ic) CCD camera attached
to the Murikabushi 1m telescope of Ishigakijima Astronomical
Observatory.

The observation started on 2010-09-03 18:04:55 UT (~0.94 day after the
burst). We did not find any new point source within the Enhanced
XRT error circle (Beardmore et al. GCNC 11188) in all the three 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'     Rc     Ic
------------------------------------------------------
0.94445    18:11:55   720.0      >21.8  >21.4  >20.2
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]