TITLE: GCN CIRCULAR NUMBER: 6527 SUBJECT: Swift Trigger 282176 is Cygnus X-1 DATE: 07/06/13 11:33:54 GMT FROM: David Palmer at LANL L. Vetere (PSU), S. D. Barthelmy (GSFC), D. Grupe (PSU), J. A. Kennea (PSU), D. M. Palmer (LANL), P. Romano (Univ. Bicocca & INAF-OAB) and R. L. C. Starling (U Leicester) report on behalf of the Swift Team: BAT trigger 282176 (2007-06-13 11:13:41 UT) was not a GRB. Instead, it is the remnant of the Cyg X-1 peak after bright source peak removal in the image (cleaning). This is an instrumental and statistical artifact, and does not indicate an interesting variation in the Cyg X-1 flux.