TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4472 SUBJECT: GRB 060110: ROTSE-III Confirmation of Optical Counterpart DATE: 06/01/10 14:31:47 GMT FROM: Wiphu Rujopakarn at U Michigan/ROTSE W. Rujopakarn (U Mich), T.A. McKay (U Mich), F. Yuan (U Mich), H. Swan (U Mich), D.A. Smith (Guilford), S. A. Yost (U Mich) report on behalf of the ROTSE collaboration: ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 060110 (Zane al. GCN 4463). The first image was at 08:01:44.8 UT, 27.1 s after the burst (9 s after the GCN notice time). Imaging is shallow due to the brightness of the Moon. The unfiltered images are calibrated relative to USNO A2.0 R-band. We detect the source reported by Bloom (GCN 4471) near the limiting magnitude of the early coadded exposures. It was ~15.5 mag at about 50 s post-trigger, in an image at limiting magnitude 16.0 Further data analyses are in progress.