TITLE: GCN CIRCULAR NUMBER: 11873 SUBJECT: GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits DATE: 11/04/03 13:13:07 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 110402A (Ukwatta et al., GCN 11857) 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 (Beardmore et al., GCNC 11860) in all the three bands. We could not detect the previously reported afterglow (Mundell et al., GCN 11858). Ishigakijima Astronomical Observatory: The observation started on 2011-04-02 12:18:01 UT, (~12.1 h after the burst). T0+[day] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------ 0.53014 12:56:21 3540.0 >21.4 >21.4 >20.4 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec] Okayama Astrophysical Observatory: The observation started on 2011-04-02 13:51:58 UT, (13.7 h after the burst). Three sigma upper limits of the OT are listed below. We used SDSS catalog for flux calibration. T0+[day] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------ 0.56634 13:48:29 8400.0 >19.6 >20.0 >19.4 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]