The Cannonball Model of Gamma Ray Bursts: Spectral and Temporal Properties of the Gamma Rays

TL;DR

The paper introduces the Cannonball Model, explaining gamma ray bursts as jets of plasma ejected from supernovae, successfully describing their spectral and temporal properties through a new jet-based mechanism.

Contribution

It proposes a novel jet-based mechanism involving relativistic plasma ejections from supernovae to explain GRB properties, aligning well with observations.

Findings

Accurately models total energy and spectrum of GRBs

Describes time-dependence of individual GRB pulses

Explains GRB emission via relativistic jet interactions

Abstract

Recent observations suggest that gamma ray bursts (GRBs) and their afterglows are produced by highly relativistic jets emitted in supernova explosions. We have proposed that the result of the event is not just a compact object plus the ejecta: within days, a fraction of the parent star falls back to produce a thick accretion disk. The subsequent accretion generates jets and constitutes the GRB ``engine'', as in the observed ejection of relativistic ``cannonballs'' of plasma by microquasars and active galactic nuclei. Here we investigate the production of a GRB as the jetted cannonballs exit the supernova shell reheated by their collision with it, emitting highly forward-collimated radiation. Each cannonball corresponds to an individual pulse in a GRB. We cannot predict the timing sequence of these pulses, but the Cannonball Model fares very well in describing the total energy, energy spectrum, and time-dependence of the individual pulses.