TITLE: GCN CIRCULAR NUMBER: 7122 SUBJECT: GRB 071122: ROTSE-III Optical Limits DATE: 07/11/22 02:00:31 GMT FROM: Eli Rykoff at UCSB E.S. Rykoff (UCSB), W. Rujopakarn (Steward), B. E. Schaefer (Louisiana State), T.A. McKay (U Mich), H. Swan (U Mich), report on behalf of the ROTSE collaboration: ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 071122 (Swift trigger 297114; Stamatikos et al., GCN 7121), producing images beginning 8.5 s after the GCN notice time. An automated response took the first image at 01:24:51.5 UT, 85.9 s after the burst, under fair conditions. These observations were affected by proximity to the full moon. We took 10 5-sec, and 30 20-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. Individual images have limiting magnitudes ranging from 15.7-16.8; we set the following specific limits. start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd? -------------------------------------------------------------------- 01:24:51.5 01:24:56.5 5 15.8 85.9 N 01:24:51.4 01:25:58.5 67 17.3 85.8 Y 01:26:12.0 01:30:54.8 282 17.8 166.4 Y