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

TL;DR

This paper introduces the E_peak-fluence energy ratio as a new discriminator for classifying gamma-ray bursts, revealing two distinct classes and suggesting different progenitor types based on BATSE data.

Contribution

The study proposes a novel E_peak-fluence relation as a physically meaningful discriminator for GRB classification, supported by analysis of BATSE data.

Findings

Identifies two distinct GRB classes based on E_peak-fluence relation.

Supports the existence of two different GRB progenitor types.

Confirms the E_peak-E_iso relation in the absence of redshift data.

Abstract

Using the derived gamma-ray burst E_peak and fluences from the complete BATSE 5B Spectral Catalog, we study the ensemble characteristics of the E_peak-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 E_peak-E_iso relations in the E_peak-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.