TITLE: GCN CIRCULAR NUMBER: 11700 SUBJECT: GRB 110212A: ROTSE-III Optical Limits DATE: 11/02/12 01:51:42 GMT FROM: Weikang Zheng at U.of Michigan W. Zheng (U Mich), report on behalf of the ROTSE collaboration: ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 110212A (Swift trigger 445321; D'Elia et al., GCN 11699), producing images beginning 31.0 s after the GCN notice time. An automated response took the first image at 01:09:39 UT, 31.0 s after the burst. Unfortunately the sky is still under twilight conditions, the first useful image stared 725s after the burst. Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma Swift/BAT error circle for co-added images with a sets of 10 calibrated relative to USNO A2.0 (R). We set the following specific limits. start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd? -------------------------------------------------------------------- 01:21:13.5 01:25:54.7 281 16.8 725.5 Y 01:26:04.0 01:30:45.5 281 17.1 1016.0 Y 01:30:54.3 01:35:35.5 281 17.2 1306.3 Y 01:35:44.3 01:40:25.0 280 17.4 1596.3 Y