[vsnet-grb-info 9192] GRB100423A: MITSuME optical upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10678
SUBJECT: GRB100423A: MITSuME optical upper limits
DATE:    10/04/25 08:13:10 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 100423A (Stroh et al. GCNC 10651)
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 2010-04-23 13:27:35 UT (~12.9h after the
burst). We could not detect the previously reported afterglow
(Filgas et al., GCN 10652) in all the three bands.

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


T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.59033   14:45:04  4500.0      >18.9  >19.0  >18.4
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]