TITLE: GCN CIRCULAR NUMBER: 14205 SUBJECT: GRB 130215: ROTSE-III Detection of Optical Counterpart DATE: 13/02/15 01:54:24 GMT FROM: Heather Flewelling at IfA/Hawaii W. Zheng (UC Berkeley), H. Flewelling (IfA/Hawaii), report on behalf of the ROTSE collaboration: ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 130215 (Swift trigger 548760). The first image was at 01:43:07.3 UT, 697.1 s after the burst (8.3 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: 02:54:00.7 +13:23:43.7 (J2000), with positional uncertainty of 1" or better start UT mag mlim(of image) ---------------------------------- 01:43:07.3 14.2 16.2 A jpeg image is available at http://www.rotse.net/images/gsb548760_3b00_img.jpg Note that the object marked 8 is the candidate in question. Continuing observations are in progress.