TITLE: GCN CIRCULAR NUMBER: 12655 SUBJECT: GRB111210A: MITSuME Okayama J-band upper-limit DATE: 11/12/10 22:48:20 GMT FROM: Kenshi Yanagisawa 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 GRB111210A (Siegel et al, GCN12650, Stamatikos et al, GCN12651) in J-band with a wide-field NIR camera at Okayama Astrophysical Observatory (Japan). The camera has an effective aperture of 0.91m. Observations started from 17:59 UT on 10th December, 3.37 hours after the BAT trigger, to 19:35 UT. The total exposure of 73 min was successfully obtained. In our co-add image, we did not find any new point source within the enhanced XRT error circle (Goad et al., GCNC 12652) down to limiting magnitude of J=16.0 (Vega, S/N=10). The photometric calibration was made against 2MASS field stars. T0+[s] MID-UT T-EXP[sec] J --------------------------------------------------- +15,000 18:47 4,380 >16.0(S/N=10) --------------------------------------------------- T0+ : Elapsed time after the burst [sec] T-EXP: Total Exposure time [sec]