TITLE: GCN CIRCULAR NUMBER: 5759 SUBJECT: GRB061025: ROTSE-III Confirmation of Optical Counterpart DATE: 06/10/26 19:56:13 GMT FROM: Fang Yuan at ROTSE F. Yuan (U Mich), E.S. Rykoff (U Mich) report on behalf of the ROTSE collaboration: Further analysis of the early ROTSE-IIIc images (Rykoff, et al, GCN 5752) reveals a faint, fading afterglow at the XRT position (Mineo, et al, GCN 5753) consistent with the position of the i-band candidate reported by Berger (GCN 5754). This source was not detected in the original analysis because of source confusion with a nearby star, and because the afterglow is near our detection threshold. In our initial 5 s image beginning at 18:36:46.6 UT, 44.7 s after the burst, the afterglow is at 15.6+/-0.2 mag calibrated relative to USNO B1.0 (R). It decays with a power law index ~ -0.9 up to ~155 s after the burst when it is no longer detected. start UT end UT t_exp(s) mag t_start-tGRB(s) Coadd? -------------------------------------------------------------------- 18:36:46.6 18:36:51.6 5 15.6+/-0.2 44.7 N