TITLE: GCN CIRCULAR NUMBER: 9843 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 273123112 is not a GRB DATE: 09/08/28 16:20:45 GMT FROM: Sheila McBreen at MPE S. McBreen (UCD/MPE) reports on behalf of the Fermi GBM Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 273123112 at 03:31:50.22 UT on 28 August 2009, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to a Terrestrial Gamma-Ray Flash (TGF)."