[vsnet-grb-info 19552] GRB 170705A: MITSuME Akeno Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  21295
SUBJECT: GRB 170705A: MITSuME Akeno Optical Observation
DATE:    17/07/05 15:27:51 GMT
FROM:    Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac at m.titech.ac.jp>

S. Harita, Y. Saito, R. Itoh,  Y. Tachibana, T. Yoshii, 
K. Morita, T. Ozawa, H. Mamiya, K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:

We searched for the optical counterpart of GRB 170705A (R. L. C. Starling et al.,
GCN Circular #21289) with the optical three color (g', Rc, and Ic) CCD cameras 
attached to the MITSuME 50cm telescope of Akeno Observatory, Yamanashi, Japan.

The observation started on 2017-07-05 11:21:20.84 UT. 
We did not find any new point source within XRT circle in all three bands. 
We obtained following limits for the magnitudes.

T0+[hour]    MID-UT      T-EXP[sec]         g'              Rc                    Ic
-------------------------------------------------------------------------------------------------------
~8.59       12:29:51            1320          >18.5        >17.9                >17.8
-------------------------------------------------------------------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.