GCN Circular 6512
Subject
GRB 070610: MITSuME OAO optical upper limit
Date
2007-06-12T07:07:28Z (18 years ago)
From
Michitoshi Yoshida at Okayama Astrophysical Obs <yoshida@oao.nao.ac.jp>
M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama (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 070610 (Pagani et al. GCN 6489) with 50cm MITSuME
telescope at Okayama Astrophysical Observatory from UT 12:27 to
UT 12:41 on Jun 11 2007.
We coadded 12 CCD frames for each band. Exposure time of each
frame is 1 minute. We made flux calibration using USNO B1.0
catalg. No new source was found at the position of the afterglow
candidate reported by A. de Ugarte Postigo (GCN 6501) and the XRT
source reported by Pagani et al. (GCN 6490). Three sigma limiting
magnitudes of our observation are listed below.
----------------------------------------------------
band mid-UT exp.time upper limit
g' Jun 11 12:34 12 x 1 min. 18.7 mag
Rc Jun 11 12:34 12 x 1 min. 19.0 mag
Ic Jun 11 12:34 12 x 1 min. 19.0 mag
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