The canonical Gamma-Ray Bursts and their "precursors"

TL;DR

This paper explains the structure of Gamma-Ray Bursts using the fireshell model, detailing the sequence and intensities of the initial P-GRB and subsequent afterglow, and proposes a new classification system for GRBs.

Contribution

It introduces a detailed theoretical framework for GRB structure based on the fireshell model, clarifying the nature of P-GRBs and proposing a novel classification scheme.

Findings

The fireshell model predicts the sequence of P-GRB and afterglow.

It provides estimates for the timing and intensity of GRB components.

A new classification of GRBs surpassing traditional short/long categories.

Abstract

The fireshell model for Gamma-Ray Bursts (GRBs) naturally leads to a canonical GRB composed of a proper-GRB (P-GRB) and an afterglow. P-GRBs, introduced by us in 2001, are sometimes considered "precursors" of the main GRB event in the current literature. We show in this paper how the fireshell model leads to the understanding of the structure of GRBs, with precise estimates of the time sequence and intensities of the P-GRB and the of the afterglow. It leads as well to a natural classification of the canonical GRBs which overcomes the traditional one in short and long GRBs.