TITLE: GCN CIRCULAR NUMBER: 17050 SUBJECT: Swift Trigger 618134 is not an astrophysical event DATE: 14/11/10 03:54:09 GMT FROM: David Palmer at LANL S. D. Barthelmy (GSFC), M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB), D. M. Palmer (LANL) and T. N. Ukwatta (LANL) report on behalf of the Swift Team: At 03:43:55 UT, the Swift Burst Alert Telescope (BAT) triggered while there was a star tracker loss of lock. It mistakenly identified Vela X-1 as a new source.