TITLE: GCN CIRCULAR NUMBER: 13399 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 120628.973 is not a GRB DATE: 12/06/29 01:15:17 GMT FROM: Michael Burgess at UAH Subject: Fermi Gamma-ray Burst Monitor trigger 120628.973 is not a GRB J. Michael Burgess (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: The Fermi Gamma-ray Burst Monitor (GBM) trigger 120628.973 at 23:20:41 UT on 28 June 2012, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to a particle event.