TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4193 SUBJECT: GRB 051105b: ART optical limits DATE: 05/11/05 13:55:52 GMT FROM: Ken ichi Torii at RIKEN K. Torii (Osaka U.) reports on behalf of the ART collaboration: The error region of the INTEGRAL GRB 051105b (Mereghetti et al. GCN4192) was observed by the 14 inch Automated Response Telescope. Imaging started at 2005 November 5, 11:07:29 UT (94 s after the trigger) and 60 s integration in Ic band was repeated. Early data suffered from low transparency. We note a bright star, SAO 215170 (V=9.0), within the INTEGRAL error circle. While no new object is identified and the following upper limits are derived for an optical afterglow. ------------------------------------------ StartUT Filter Mag Nframes ------------------------------------------ 11:19:21 Ic > 7.3 1 11:24:42 Ic >10.7 2 ------------------------------------------