TITLE: GCN CIRCULAR NUMBER: 15582 SUBJECT: Swift Trigger 580319 is not a GRB DATE: 13/12/05 18:24:15 GMT FROM: David Palmer at LANL J. R. Cummings (NASA/UMBC), H. A. Krimm (CRESST/GSFC/USRA) and D. M. Palmer (LANL) report on behalf of the Swift Team: The Swift-BAT trigger 580319 (at 17:58:20 UT) is not due to an astrophysical event. This peak is due to a source that was misidentified as a result of a known race condition in the onboard software.