Reclassification of gamma-ray bursts based on their brightness distributions

Abstract

A reclassification of the cosmic gamma-ray bursts has been done into two distinct classes on the basis of their brightness distributions. While one (majority) class is found to be compatible with a homogeneous and monoluminosity source population with simple cosmological effects folded into the brightness distribution function, the other, smaller population is not consistent with such a scenario and may need a consideration of source evolutionary effects.