TITLE: GCN CIRCULAR NUMBER: 12204 SUBJECT: GRB110726A: MITSuME Ishigakijima Optical Observation DATE: 11/07/27 00:03:12 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 110726A (Wolf et al., GCN 12196) 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 12:56:13 UT (~11.4 h after the burst). We detected the previously reported afterglow (Schaefer et al., GCN 12197; Melandri et al., GCN 12198) in Rc bands. Photometric results and three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration. #T0+[day] MID-UT T-EXP[sec] g' Rc Rc_err Ic ---------------------------------------------------------------------- 0.53142 14:15:55 7020.0 >22.3 21.8 0.2 >20.7 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]