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Using the derived gamma-ray burst E_peak and fluences from the complete BATSE5B Spectral Catalog, we study the ensemble characteristics of theE_peak-fluence relation for GRBs. This relation appears to be a physicallymeaningful and insightful fundamental discriminator between long and shortbursts. We discuss the results of the lower limit test of the E_peak-E_isorelations in the E_peak-fluence plane for BATSE bursts with no observedredshift. Our results confirm the presence of two GRB classes as well asheavily suggesting two different GRB progenitor types.

A New Discriminator for Gamma-Ray Burst Classification: The Epeak-Fluence Energy Ratio