TITLE: GCN CIRCULAR NUMBER: 6464 SUBJECT: Swift Triggers 280447, 280450 and 280451 are invalid DATE: 07/05/26 09:54:59 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), G. Cusumano (INAF-IASFPA), V. Mangano (INAF-IASFPA), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), C. Pagani (PSU), D. M. Palmer (LANL), P. Romano (Univ. Bicocca & INAF-OAB), B. Sbarufatti (INAF-IASFPA), R. L. C. Starling (U Leicester), G. Tagliaferri (INAF-OAB), D. E. Vanden Berk (PSU) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team: Due to a loss of star tracker lock, triggers 280447, 280450 and 280451 were due to known sources and are not new transients or GRBs. GCN# 6463 (Marshall et al.) re. trigger 280477 is retracted. [GCN OPS NOTE(03jun07): Per author's request, "280477" was changed to "280447" in the Subject-line and the body of the CIrcular.]