TITLE: GCN CIRCULAR NUMBER: 19440 SUBJECT: Swift-BAT trigger 686845 was due to noise near a known source DATE: 16/05/19 19:59:48 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC) on behalf of the Swift-BAT team: Using the full data set from T-239 to T+303 sec from recent telemetry downlinks, we report that trigger #686845 was due to a noise fluctuation in the image domain that was located close to a known source (XTE J2123-058). Ground analysis shows the significance has dropped to 2.5 sigma.