TITLE: GCN CIRCULAR NUMBER: 21887 SUBJECT: Fermi GBM trigger 527149931/170915272 is not a GRB DATE: 17/09/15 14:04:39 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: “The Fermi Gamma-ray Burst Monitor (GBM) trigger 527149931/170915272 at 06:32:06.08 UT on 15 September 2017, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to local particles."