[vsnet-grb-info 15800] GRB 141121A: MITSuME Akeno Optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17088
SUBJECT: GRB 141121A: MITSuME Akeno Optical observation
DATE:    14/11/23 11:44:55 GMT
FROM:    Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac at m.titech.ac.jp>

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

We observed the field of GRB 141121A (Lien et al., GCN Circular #17075) 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 on 2014-11-21 12:59:47 UT (~9 h after the burst).
We detected the previously reported optical afterglow (Tanga et al., GCN Circular #17078) in the g',Rc and Ic band.

The measured magnitudes are listed below.

T0+[sec]  MID-UT  T-EXP[sec]    g'                Rc             Ic
----------------------------------------------------------------------
32947      17:07:07  12840     20.8 +/- 0.2  19.7 +/- 0.1  19.4 +/- 0.2
----------------------------------------------------------------------
T0+ : Elapsed time after the burst 
T-EXP: Total Exposure time 
We used GSC2.3 catalog for flux calibration.