TITLE: GCN CIRCULAR NUMBER: 20334 SUBJECT: Fermi GBM trigger 504233075/161224301 is not a GRB DATE: 16/12/24 02:30:32 GMT FROM: Rachel Hamburg at UAH R. Hamburg (UAH) reports on behalf of the Fermi GBM Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 504233075/161224301 at 00:44:31.45 on 24 December 2016, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to local particles."