TITLE: GCN CIRCULAR NUMBER: 20555 SUBJECT: Swift Trigger 735413 is not an astrophysical event DATE: 17/01/28 03:48:19 GMT FROM: David Palmer at LANL S. B. Cenko (GSFC), A. D'Ai (INAF-IASFPA), V. D'Elia (ASDC), J. A. Kennea (PSU) and D. M. Palmer (LANL) report on behalf of the Swift Team: Due to a known race condition in the BAT onboard software, Swift incorrectly misidentified a currently-active source as an newly-active source above threshold. This is not an interesting astrophysical event.