TITLE: GCN CIRCULAR NUMBER: 12490 SUBJECT: GRB 111022A: MITSuME Akeno Optical upper limits DATE: 11/10/24 12:25:42 GMT FROM: Yoichi Yatsu at Tokyo Tech. K. Tokoyoda, Y. Yatsu, Y. Aoki, R. Usui, K. Kawakami, M. Hayashi, S. Song, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed GRB 111022A (S. Immler et al, GCN12471) with the optical three color (g, Rc, and Ic) CCD camera attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started on 2011-10-23 9:16:56 UT (~16.8 h after the burst). We did not find any new point source within the Swift XRT error circle (G. Stratta et al, GCN12482) in three bands. Photometric results and are listed below. We used GSC2.3 catalog for flux calibration. T0+[day] MID-UT T-EXP[sec] g' Rc Ic --------------------------------------------------------------------------------- 0.71519 9:47:22 3060 >18.4 >16.5 >16.5 --------------------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]