A New Discriminator for Gamma-Ray Burst Classification: The Epeak-Fluence Energy Ratio
Abstract
Using the derived gamma-ray burst Epeak and fluences from the complete BATSE 5B Spectral Catalog, we study the ensemble characteristics of the Epeak-fluence relation for GRBs. This relation appears to be a physically meaningful and insightful fundamental discriminator between long and short bursts. We discuss the results of the lower limit test of the Epeak-Eiso relations in the Epeak-fluence plane for BATSE bursts with no observed redshift. Our results confirm the presence of two GRB classes as well as heavily suggesting two different GRB progenitor types.
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