[vsnet-grb-info 7568] GRB 090410: MITSuME optical upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9126
SUBJECT: GRB 090410: MITSuME optical upper limits
DATE:    09/04/13 08:31:45 GMT
FROM:    Michitoshi Yoshida at Okayama Astrophysical Obs  <yoshida at oao.nao.ac.jp>

M. Yoshida, D. Kuroda, K. Yanagisawa, Y. Shimizu, S. Nagayama,
H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf
of the MITSuME collaboration:

We observed the field of GRB 090410 (Grupe et al. GCN 9122;
Barthelmy et al. GCN 9123) with optical three color (g', Rc and
Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama
Astrophysical Observatory. We started the observation at 18:12:59
UT, 4507s after the alert. We did not detect any new point source
within the BAT error circle (Barthelmy et al. GCN 9123). 3-sigma
upper limits to our observation are listed below. We used GSC2.3
catalog for flux calibration.

       Mid-UT           Td       EXP-T      g'     Rc    Ic
-------------------------------------------------------------
2009-04-10 18:57:15   7163sec   72x60sec  >17.9  >18.1  >18.5
-------------------------------------------------------------