TITLE: GCN CIRCULAR NUMBER: 21490 SUBJECT: Fermi GBM trigger 524493492/170815526 is not a GRB DATE: 17/08/15 18:54:00 GMT FROM: Oliver J Roberts at USRA/NASA O.J. Roberts (USRA) and A. von Kienlin (MPE) report on behalf of the Fermi GBM Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 524493492/170815526 at 12:38:07.06 UT on 15 August 2017, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to a flaring source within the galactic plane."