TITLE: GCN CIRCULAR NUMBER: 20607 SUBJECT: Fermi GBM trigger 507959893/170205165 is not a GRB DATE: 17/02/05 17:26:39 GMT FROM: Matthew Stanbro at UAH/Fermi M. Stanbro (UAH) reports on behalf of the Fermi GBM Team: The Fermi Gamma-ray Burst Monitor (GBM) trigger 507959893/170205165 at 03:58:08.86 UT on 05 February 2017, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to local particles.