# Analysis of the duration$-$hardness ratio plane of gamma-ray bursts with skewed distributions

## TL;DR

This paper demonstrates that gamma-ray burst data from multiple space observatories can be effectively modeled with two skewed distribution components in the duration-hardness ratio plane, challenging the need for a third class.

## Contribution

It extends previous findings by showing that various gamma-ray burst datasets are consistent with a two-class skewed distribution model, simplifying the classification scheme.

## Key findings

- Gamma-ray burst data are well described by two skewed components.
- The two-class model applies across multiple datasets from different observatories.
- The intermediate class of gamma-ray bursts is unnecessary according to this analysis.

## Abstract

It was recently shown that the $T_{90}-H_{32}$ distributions of gamma-ray bursts from CGRO/BATSE and Fermi/GBM are well described by a mixture of only two skewed components, making the presumed third, intermediate class unnecesary. The Swift/BAT, Konus-Wind, RHESSI and Suzaku/WAM data sets are found to be consistent with a two-class description as well.