[vsnet-grb-info 15927] GRB 141220A: MITSuME Akeno upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17215
SUBJECT: GRB 141220A: MITSuME Akeno upper limits
DATE:    14/12/22 07:06:48 GMT
FROM:    Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac at m.titech.ac.jp>

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

We observed the field of GRB 141220A (J. R. Cummings et al., GCN Circular #17196) 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 2014-12-20 15:16:22 UT (~9.2 h after the burst).
We did not find any new point source within the refined XRT error circle 
(B. P. Gompertz., GCN Circular #17203) in all the three bands.

The measured magnitudes are listed below.

T0+[sec]     MID-UT    T-EXP[sec]        g'         Rc        Ic
-----------------------------------------------------------------------------
36707        18:07:29        8460          >21.4  >20.8  >20.4
-----------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.