TITLE: GCN CIRCULAR NUMBER: 13263 SUBJECT: GRB 120422A: MITSuME Ishigakijima upper limit DATE: 12/04/26 15:20:07 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 120422A (Troja et al., GCNC 13243) 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 2012-04-22 13:03:25 UT (~5.9 h after the burst). We could not detect the previously reported afterglow (Cucchiara et al., GCNC 13245) in all the three bands. Three sigma upper limits of the OT are listed below. We used SDSS catalog for flux calibration. #T0+[day] MID-UT T-EXP[sec] g' Rc Ic ---------------------------------------------------------------------- 0.27008 13:40:57 2880.0 >21.5 >21.3 >19.5 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]