[vsnet-grb-info 4818] GRB 070612B: Optical Observation by MITSuME Akeno

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6553
SUBJECT: GRB 070612B: Optical Observation by MITSuME Akeno
DATE:    07/06/18 06:36:27 GMT
FROM:    Nobuyuki Kawai at Tokyo Tech  <nkawai at 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
-----------------------------------------------------------------