TITLE: GCN CIRCULAR NUMBER: 10132 SUBJECT: GRB091102 : MOA optical upper limit DATE: 09/11/04 16:05:21 GMT FROM: Kenta Nishimoto at Nagoya U/MOA-II K. Nishimoto, D. Suzuki, T. Sako, and F. Abe (STE Lab, Nagoya Univ.) on behalf of the MOA Collabration report: We searched for an optical afterglow of GRB091102 (Hoversten et al. GCN 10117) starting from 14:57:07.8 UT on 2009 Nov 2 (22.5 minuts after the burst) with the MOA-II 1.8m telescope at Mt.John observatory in New Zealand. In a single image of a 60sec exposure with a wideband Red filter (center wavelength ~ 750nm and FWHM ~ 250nm), we did not find any object within the error circle of the Swift XRT source position (GCN 10120), except a star reported by BOOTES-3 (De Ugarte Postigo et al. GCN 10122) and GROND (R. Filgas et al. GCN 10123), which has I mag=19.15 and the separation of 1.6 arcsec from the center of the position. A 5 sigma upper limit is set in the I magnitude at 20.8 mag. This photometry was done by using the DoPhot and calibrated against the USNO-B1.0 cataloged stars, and not corrected for the Galactic extinction.