Classification of Fermi Gamma-RAY Bursts

TL;DR

This paper analyzes the Fermi GBM Gamma-Ray Burst catalog using PCA and clustering to classify GRBs into three groups, confirming the short GRBs and splitting long GRBs into bright and dim categories, with further validation needed.

Contribution

It introduces a new classification of Fermi GBM GRBs into three groups using PCA and multiclustering, expanding on previous classifications.

Findings

Three groups identified in the GBM catalog.

One group matches short GRBs.

Long GRBs split into bright and dim categories.

Abstract

The Fermi GBM Catalog has been recently published. Previous classification analyses of the BATSE, RHESSI, BeppoSAX, and Swift databases found three types of gamma-ray bursts. Now we analyzed the GBM catalog to classify the GRBs. PCA and Multiclustering analysis revealed three groups. Validation of these groups, in terms of the observed variables, shows that one of the groups coincides with the short GRBs. The other two groups split the long class into a bright and dim part, as defined by the peak flux. Additional analysis is needed to determine whether this splitting is only a mathematical byproduct of the analysis or has some real physical meaning.