TITLE: GCN CIRCULAR NUMBER: 12344 SUBJECT: GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits DATE: 11/09/16 00:58:08 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda, (OAO, NAOJ), H. Hanayama (IAO, NAOJ), K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), T. Miyaji J. Watanabe, (IAO, 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 110915A (Holland et al., GCNC 12335) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory and the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory. We did not find any new point source within the enhanced XRT error circle (Evans, GCNC 12336) in all the three bands. Three sigma upper limits of the OT are listed below. We used SDSS catalog for flux calibration. Ishigakijima Astronomical Observatory: The observation started on 2011-09-15 13:28:55 UT (~8.2 min after the burst). T0+[day] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------ 0.07421 15:07:35 9360.0 >22.0 >21.8 >20.7 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec] Okayama Astrophysical Observatory: The observation started on 2011-09-15 14:58:17 UT (~1.6 h after the burst). T0+[day] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------ 0.08645 15:25:12 3060.0 >19.8 >20.2 >19.34 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]