TITLE:   GCN CIRCULAR
NUMBER:  7885
SUBJECT: GRB080613A: Optical upper limits with Okayama MITSuME telescope
DATE:    08/06/17 23:26:42 GMT
FROM:    Michitoshi Yoshida at Okayama Astrophysical Obs  <yoshida@oao.nao.ac.jp>

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

We performed optical imaging observation (g', Rc, and Ic) of the
field of GRB 080613A (Gotz et al. GCN 7871) with 50cm MITSuME
telescope at Okayama Astrophysical Observatory from 13:44:35 UT
(4h 9m after the trigger) to UT 15:13:05 on June 13 2008.

We found no new source within a 10 arcsec radius of the position
of the optical afterglow candidate reported by Guidorzi et al.
(GCN 7872). Three sigma limiting magnitudes of our observation
are listed below.


Start-UT              mid-UT    exp-T    g'      Rc      Ic
--------------------------------------------------------------
2008-06-13 13:44:35   14:28:50  77min    >18.4   >17.7   >16.7
--------------------------------------------------------------