TITLE: GCN CIRCULAR NUMBER: 4011 SUBJECT: GRB 050922C: ROTSE-III Detection of Possible Counterpart DATE: 05/09/22 20:04:53 GMT FROM: Eli Rykoff at U of Michigan/ROTSE E.S. Rykoff (U Mich), S.A. Yost (U Mich), W. Rujopakarn (U Mich) report on behalf of the ROTSE collaboration: ROTSE-IIId, located at the Turkish National Observatory at Bakirlitepe, Turkey, responded to GRB 050922C (Swift trigger 156467). The first image was at 19:58:42.8 UT, 172.4 s after the burst (6.8 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. We detect a new object, not visible in the DSS (second epoch), with coordinates: 21:09:33.1 -08:45:29.8 (J2000) start UT mag mlim(of image) ---------------------------------- 19:58:42.8 14.7 16.1 Continuing observations are in progress. [GCN OPS NOTE(22sep05): Per author's request, the two instances of 'A' were changed to 'C'.]