TITLE: GCN CIRCULAR NUMBER: 12345 SUBJECT: GRB110915A MITSuME Okayama J-band upper-limit DATE: 11/09/16 04:24:57 GMT FROM: Daisuke Kuroda at OAO/NAOJ Kenshi Yanagisawa, Daisuke Kuroda, Yasuhiro Shimizu, Kiichi Okita (OAO/NAOJ), Michitoshi Yoshida (Hiroshima-U), Kouji Ohta(Kyoto-U) and Nobuyuki Kawai(Tokyo Tech.) report on behalf of the MITSuME collaboration. We observed the field of GRB110915A (Holland et al, GCN12355) in J-band with a wide-field near infrared imager at Okayama Astrophysical Observatory (Japan). The imager has effective aperture of 0.91 m. Observations started from 15:19 UT on 15th September, just 2 hours after the BAT trigger, to 16:02 UT. The total exposure of 35 min was successfully obtained. In our co-add image, we did not find any new point source within the enhanced XRT error circle (P.A. Evans et al., GCNC 12340) down to limiting magnitude of J=17.3 (Vega, S/N=3) . The photometric calibration was made against 2MASS field stars. T0+[s] MID-UT T-EXP[sec] J --------------------------------------------------- +8130 15:35 2110 >17.3 --------------------------------------------------- T0+ : Elapsed time after the burt [sec] T-EXP: Total Exposure time [sec]