[vsnet-grb-info 16365] GRB 150323C: MITSuME Akeno Optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17646
SUBJECT: GRB 150323C: MITSuME Akeno Optical observation
DATE:    15/03/26 14:10:07 GMT
FROM:    Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac at m.titech.ac.jp>

 T.Fujiwara, Y. Saito, T. Yoshii, Y. Tachibana, H. Ohuchi, 
Y. Yano, S.Kurita, Y. Ono, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:

We observed the field of GRB 150323C (Amaral-Rogers et al. GCN Circular #17621) with the
optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm
telescope of Akeno Observatory, Yamanashi, Japan.

The observation started at 2015-03-23 17:06:46 UT (85 sec after the burst).
We detected the previously reported optical afterglow (Xu et al. GCN Circular #17625) in the Rc band.

The measured magnitudes are listed below.

T0+[sec]  MID-UT  T-EXP[sec]    g'                Rc             Ic
----------------------------------------------------------------------
85   17:09:24  270     > 19.9  > 19.6  > 18.5
1069   17:34:06  1200    > 20.9  20.3 $B!^(B 0.5  > 19.5
6681   19:18:53  2400    > 20.4  > 20.4  > 19.4
----------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.