What is the Astrophysical Meaning of the Intermediate Subgroup of GRBs?

TL;DR

This paper surveys the existence and significance of the intermediate subgroup of gamma-ray bursts (GRBs), questioning whether it represents a distinct astrophysical phenomenon or is an artifact of data selection.

Contribution

It critically examines the statistical and astrophysical validity of the intermediate GRB subgroup, highlighting the need for further investigation into its physical nature.

Findings

The intermediate subgroup's existence depends on data set choice.

Its astrophysical significance remains uncertain.

The subgroup may be an artificial selection effect.

Abstract

Published articles concerning the intermediate (third) subgroup of GRBs are surveyed. From a statistical perspective this subgroup may exist, however its significance depends on which data set is used. Its astrophysical meaning is unclear because the occurrence of this subgroup can also be an artificial selection effect. Hence, GRBs from this subgroup need not be given by a physically different phenomenon. The aim of this contribution is to search for the answer to the question in the title.