TITLE: GCN CIRCULAR NUMBER: 18138 SUBJECT: Swift Trigger 652046 is a particle shower event DATE: 15/08/13 14:36:45 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-60 to T+303 sec from recent telemetry downlinks, we report that trigger #652046 is due to a particle shower event in BAT. There were 118 photons and/or particles in a single 100 microsec timestamp interval. This trigger is not anything astrophysical.