Correlations between Lag, Duration, Peak Luminosity, Hardness, and Asymmetry in Long GRB Pulses

TL;DR

This study analyzes correlations among various pulse properties in long GRBs, revealing relationships that can distinguish long from short GRBs and provide constraints for theoretical models.

Contribution

It confirms known correlations and uncovers new links between pulse lag, duration, asymmetry, and hardness in long GRBs, aiding in classification and modeling.

Findings

Correlations between pulse lag and duration confirmed.

Pulse properties correlate with peak flux and hardness.

These correlations help differentiate long and short GRBs.

Abstract

Continued study of the BATSE catalog verifies previously-identified correlations between pulse lag and pulse duration and corresponding anti-correlations between both properties and pulse peak flux for a large sample of Long GRB pulses; the study also finds correlations between pulse peak lags, pulse asymmetry, and pulse hardness. These correlations apparently can be used to delineate Long GRBs from Short ones. Correlated pulse properties represent constraints that can be used to guide theoretical modeling, whereas bulk prompt emission properties appear to be constructed by combining and smearing out pulse characteristics in ways that potentially lose valuable information.