Factor analysis of the spectral and time behavior of long GRBs
Z. Bagoly, L. Borgonovo, I. Horvath, A. Meszaros, L.G. Balazs
TL;DR
This study applies factor analysis to a sample of 197 long GRBs, revealing five key factors that describe their spectral and temporal behaviors, and challenges existing pseudo-redshift and Amati-relation assumptions.
Contribution
It introduces a statistical factor analysis approach to characterize long GRBs and questions the validity of certain redshift estimation methods and spectral relations.
Findings
Five factors adequately describe GRB variability
Pseudo-redshifts from variability are disfavored
Original Amati-relation is challenged
Abstract
A sample of 197 long BATSE GRBs is studied statistically. In the sample 11 variables, describing for any burst the time behavior of the spectra and other quantities, are collected. The application of the factor analysis on this sample shows that five factors describe the sample satisfactorily. Both the pseudo-redshifts coming from the variability and the Amati-relation in its original form are disfavored.
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