[vsnet-grb-info 14881] GRB 140423A: MITSuME Akeno upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16176
SUBJECT: GRB 140423A: MITSuME Akeno upper limits
DATE:    14/04/28 12:03:53 GMT
FROM:    Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac at m.titech.ac.jp>

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

We performed the follow-up observation for optical afterglow of GRB140423A(E.Sonbas et al., GCN Circular #16142, Elenin et al.,GCN Circular #16143 etc.) 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 2014-04-24 14:10:46 UT (31.1h after the burst).
We did not find the optical source on the position of GRB140423A.

The measured magnitudes were listed below.

T0+[sec]           MID-UT             T-EXP[sec]         g'     Rc       Ic
-------------------------------------------------------------------------
44700      14-04-24 15:42:02      9600          >21.3  >21.2  >20.6
-------------------------------------------------------------------------
T0+ : Elapsed time after the burst 
T-EXP: Total Exposure time 
We used GSC2.3 catalog for flux calibration.