[vsnet-grb-info 4819] GRB070616: Optical Observation by MITSuME Akeno

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6554
SUBJECT: GRB070616: Optical Observation by MITSuME Akeno
DATE:    07/06/18 06:36:35 GMT
FROM:    Nobuyuki Kawai at Tokyo Tech  <nkawai at hp.phys.titech.ac.jp>

T. Ishimura, Y. Yatsu, T. Shimokawabe, N. Vasquez, Y.kudo, and 
N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:

We observed the error box of GRB070616 (Starling et al. GCN 6542)
with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting
at 16:52:26 June 16 UT, 22m53s after the trigger under a poor sky
condition with clouds and a high airmass.
In the co-added images of Ic, Rc, and g' bands, we did not detect
any afterglow candidate 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    Exposure   Mag (3-sigma upper limit)
-----------------------------------------------------------------
g'       16:52:26     18:03:39    58 x 60 s    17.8
Rc       16:52:26     18:03:39    58 x 60 s    19.1
Ic       16:52:26     18:03:39    58 x 60 s    18.6
-----------------------------------------------------------------