[vsnet-grb-info 15934] GRB 141221A: MITSuME Akeno upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17222
SUBJECT: GRB 141221A: MITSuME Akeno upper limits
DATE:    14/12/23 11:00:16 GMT
FROM:    Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac at m.titech.ac.jp>

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

We observed the field of GRB 141221A (E .Sonbas et al., GCN Circular #17206) 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 2014-12-21 17:20:13 UT (~9.1 h after the burst).
We did not find any new point source within the refined XRT error circle
(A.P. Beardmore., GCN Circular #17211) in all the three bands.

The measured magnitudes are listed below.

T0+[sec]     MID-UT    T-EXP[sec]        g'         Rc        Ic
-----------------------------------------------------------------------------
33183        18:51:55        9600          >21.3   >20.8   >20.2
-----------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.