[vsnet-grb-info 9790] GRB100901A: IAO optical upper limits at 4 days after the burst

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11258
SUBJECT: GRB100901A: IAO optical upper limits at 4 days after the burst
DATE:    10/09/08 18:36:26 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 100901A (Immler et al., GCN 11159)
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 2010-09-05 19:53:16 UT (~4.3 day after the
burst). We did not detect the previously reported afterglow (Immler
et al., GCN 11159 and many follow-up observations) 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
------------------------------------------------------
4.26159    19:50:52  1080.0     >21.6  >21.3  >19.8
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]