TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4132 SUBJECT: GRB 051022A: ROTSE-III Optical Limits DATE: 05/10/22 15:02:53 GMT FROM: Brad Schaefer at LSU B. E. Schaefer (Louisiana State University) reports on behalf of the ROTSE collaboration: ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded to GRB 051022A (HETE trigger 3950), producing images beginning 6.3 s after the GCN notice time. An automated response took the first image at 13:08:59.8 UT, 61.3 s after the burst, under fair conditions. We took 10 5-sec, 10 20-sec and 50 60-sec eposures. These unfiltered images are calibrated relative to USNO A2.0 (R). Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma error circle, for both single images and coadding into sets of 10. Individual images have limiting magnitudes ranging from 14.5-17.2; we set the following specific limits. start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd? -------------------------------------------------------------------- 13:08:59.8 13:11:23.8 144 17.4 61.3 Y 13:39:26.5 13:49:26.5 600 17.9 1888.0 Y