TITLE: GCN CIRCULAR NUMBER: 12499 SUBJECT: GRB 111029A: ROTSE-III Optical Limits DATE: 11/10/29 10:11:34 GMT FROM: Wiphu Rujopakarn at U AZ/Steward W. Rujopakarn (Steward), B. E. Schaefer (Louisiana State), T. Guver (U Arizona), report on behalf of the ROTSE collaboration: ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 111029A (Swift trigger 506519; Troja, GCN 12498), producing images beginning 7.7 s after the GCN notice time. An automated response took the first image at 09:46:34.7 UT, 114.2 s after the burst, under excellent conditions. We took 10 5-sec, 10 20-sec and 20 60-sec exposures. These unfiltered images are calibrated relative to USNO A2.0 (R). Imaging is on going. Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma Swift/BAT error circle or the XRT error circle, for both single images and coadding into sets of 10; the field is not crowded. Individual images have limiting magnitudes ranging from 16.9-17.6; we set the following specific limits. start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd? -------------------------------------------------------------------- 09:46:34.7 09:46:39.7 5 17.2 114.2 N 09:46:34.7 09:48:21.8 107 18.0 114.2 Y