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GCN Circular 6531

GRB070612A: MITSuME Okayama Observation
2007-06-13T23:25:29Z (16 years ago)
Michitoshi Yoshida at Okayama Astrophysical Obs <>
M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama (OAO, NAOJ)
and N. Kawai (Tokyo Tech) report on behalf of the MITSuME

We performed optical imaging observations (Rc and Ic) of the
field of GRB 070612A (Grupe et al., GCN 6509) with 50cm MITSuME
telescope at Okayama Astrophysical Observatory from UT 11:19 to
UT 11:27 on June 12 2007.

We coadded 4 CCD frames for each band. Exposure time of each
frame is 1 minute. We made flux calibration using USNO B1.0
catalg. We found a faint source at the position of the afterglow
candidate reported by Cenko et al. (GCN 6525, RA:08:05:29.6,
DEC:+37:16:15) in Ic band. The Ic magnitude was 17.1 +/- 0.3.
There was no source brigher than 16.7 magnitude in Rc band. Flux
calibration was made with three USNO-B stars around the object.

band  mid-UT          exp.time     magnitude
Rc    June 12 11:23   4 x 1 min.   > 16.7 mag (upper limit)
Ic    June 12 11:34   4 x 1 min.   17.1 mag +/- 0.3 mag
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