TITLE: GCN CIRCULAR NUMBER: 6062 SUBJECT: GRB070129: MITSuME optical observation DATE: 07/01/31 06:31:04 GMT FROM: Nobuyuki Kawai at Tokyo Tech T. Ishimura, Y. Yatsu, T. Shimokawabe, N. Vasquez, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the error box of GRB070129 (Godet et al., GCN 6053) with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting at 9:44:12 UT, 10.1 hours after the trigger. In the co-added images of Ic, Rc, and g' bands, we did not detect the afterglow . The 3-sigma limiting magnitudes based on USNO-B1.0 (I-band) and NOMAD (R-band,g'-band) stars are following. Filter start time end time Exp(s) Mag (3-sigma upper limit) ----------------------------------------------------------------- Ic 9:44:12 10:22:57 60s * 25 18.4 Rc 9:44:12 10:22:57 60s * 25 19.0 g' 9:44:12 10:22:57 60s * 25 19.4 -----------------------------------------------------------------