TITLE: GCN CIRCULAR NUMBER: 17563 SUBJECT: Fermi GBM trigger 150311331 is not a GRB DATE: 15/03/11 10:49:26 GMT FROM: Oliver Roberts at UCD/Fermi O.J. Roberts (UCD) reports on behalf of the Fermi GBM Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 447753382/150311331 at 07:56:19.87 UT on the 11th of March 2015, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to a solar flare."