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GCN Circular 6531

Subject
GRB070612A: MITSuME Okayama Observation
Date
2007-06-13T23:25:29Z (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 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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