TITLE: GCN CIRCULAR NUMBER: 16132 SUBJECT: GRB 140419A: MITSuME Ishigakijima Optical Observation DATE: 14/04/20 10:22:25 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ), K. Yanagisawa (OAO, NAOJ), S.Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 140419A (Marshall et al., GCNC 16118) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory. The observation started on 2014-04-19 12:40:26 UT (~8.6 h after the burst). We detected the previously reported afterglow (Marshall et al., GCNC 16118; Zheng et al., GCNC 16119) in all the three bands. Photometric results of the OT are listed below. We used SDSS catalog for flux calibration. #T0+[day] MID-UT T-EXP[sec] g' g'_err Rc Rc_err Ic Ic_err ---------------------------------------------------------------------- 0.39781 13:39:41 5820.0 20.6 0.1 19.5 0.1 19.1 0.1 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]