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GCN Circular 6553

Subject
GRB 070612B: Optical Observation by MITSuME Akeno
Date
2007-06-18T06:36:27Z (18 years ago)
From
Nobuyuki Kawai at Tokyo Tech <nkawai@hp.phys.titech.ac.jp>
Y.kudo, T. Ishimura, Y. Yatsu, T. Shimokawabe, N. Vasquez, and
N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:

We observed the error box of GRB070612B (Grupe et al., GCN 6511)
with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting at
11:46:53 June 12 UT, 5.1 hours after the trigger.   
In the co-added images of Ic, Rc, and g' bands, we did not detect
any new source in the XRT error circle.  The 3-sigma limiting
magnitudes based on USNO-B1.0 (I-band) and NOMAD (R-band,g'-band)
stars are following.

Filter   start time   end time    Exp(s)    Mag (3-sigma upper limit)
-----------------------------------------------------------------
g'       11:46:53    12:16:35     25 x 60s     17.4
Rc       11:46:53    12:16:35     25 x 60s     18.6
Ic       11:46:53    12:16:35     25 x 60s     18.6
-----------------------------------------------------------------
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