Authors: Andreas von Kienlin, David Gruber, Adam Goldstein, Chip Meegan and Bill Paciesas on behalf of the Fermi GBM team
Abstract: The Fermi Gamma-ray Burst Monitor (GBM) has triggered on 953 cosmic gamma-ray bursts in the first four years since trigger enabling on July 12, 2008. The year three and four gamma-ray burst and spectral catalogs are the continuation of the first GBM GRB catalogs (Paciesas et al. 2012, Goldstein et al. 2012). They will summarize the basic characteristics of the triggered GRBs, like sky location, duration, peak flux, fluences and spectral properties. The analysis of these quantities of the now larger GRB sample will be presented. These catalogs will be an official product of the Fermi GBM science team, and the data files containing the complete results will be available from the High-Energy Astrophysics Science Archive Research Center (HEASARC).