Two Dimensional Clustering of Swift/BAT and Fermi/GBM Gamma-ray Bursts

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Title: Two Dimensional Clustering of Swift/BAT and Fermi/GBM Gamma-ray Bursts
Authors: Salmon, LanaHanlon, LorraineMartin-Carrillo, Antonio
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Date: 25-Jun-2022
Online since: 2022-08-05T08:44:57Z
Abstract: Studies of Gamma-ray Burst (GRB) properties, such as duration and spectral hardness, have found evidence for additional classes beyond the short-hard (merger) and long-soft (collapsar) prototypes. Several clustering analyses of the duration-hardness plane identified a third, intermediate duration, class. In this work, Gaussian Mixture Model-based (GMM) clustering is applied to the Swift/BAT and Fermi/GBM samples of GRBs. The results obtained by the hierarchical combination of Gaussian components (or clusters) based on an entropy criterion are presented. This method counteracts possible overfitting arising from the application of Gaussian models to non-Gaussian underlying data. While the initial GMM clustering of the hardness-duration plane identifies three components (short/intermediate/long) for the Swift/BAT and Fermi/GBM samples, only two components (short/long) remain once the entropy criterion is applied. The analysis presented here suggests that the intermediate duration class may be the result of overfitting, rather than evidence of a distinct underlying population.
Funding Details: European Commission Horizon 2020
Science Foundation Ireland
Funding Details: Irish Research Council Postgraduate Scholarship
Type of material: Journal Article
Publisher: MDPI
Journal: Galaxies
Volume: 10
Issue: 4
Start page: 1
End page: 17
Copyright (published version): 2022 The Authors
Keywords: Gamma-ray burstClusteringStatistical analysis
DOI: 10.3390/galaxies10040077
Language: en
Status of Item: Peer reviewed
ISSN: 2075-4434
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