TITLE: GCN CIRCULAR NUMBER: 34510 SUBJECT: Swift Trigger 1186386 is not a GRB DATE: 23/08/21 15:09:06 GMT FROM: Boris Sbarufatti at INAF-OAB B. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team: Swift BAT triggers 1186386 at 14:52:00 UT on 2023-08-21, is due to misidentification of a known source during a Star Tracker Loss-of-Lock. It is not an astrophysical event.