TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4112 SUBJECT: GRB 051016b: Optical limit DATE: 05/10/19 02:53:53 GMT FROM: Ken ichi Torii at RIKEN K. Torii (Osaka U.) reports on behalf of the ART collaboration: The error region of the soft GRB 051016b (Parsons et al. GCN 4103) was observed by the 14 inch Automated Response Telescope. VRcIc imaging started at 2005 October 16, 18:29:54 UT (105s after the trigger) and 60s integration was repeated. The optical afterglow candidate (Chen et al. GCN 4105) is not detected in our frames and the following limiting magnitudes for single and stacked frames are derived. ------------------------------------------ StartUT Filter Limit Nframes ------------------------------------------ 18:29:54 Rc 15.7R 1 18:30:58 Ic 15.2I 1 18:29:54 V+Rc+Ic 18.3R 9V+10Rc+10Ic ------------------------------------------