The Cosmic History of Long Gamma Ray Bursts
G. Ghirlanda, R. Salvaterra

TL;DR
This paper models the cosmic evolution of long Gamma Ray Bursts (LGRBs), revealing their formation rate increases with redshift, prefers low-metallicity environments, and estimating their local rate and off-axis detection probabilities.
Contribution
It introduces a comprehensive model of LGRB formation rate and luminosity evolution that fits four decades of observational data, highlighting a steeper redshift dependence than star formation rate.
Findings
LGRB formation rate increases with redshift up to z~3
LGRBs prefer low-metallicity environments
Estimated local LGRB rate is ~79 Gpc^-3 yr^-1
Abstract
The cosmic formation rate of long Gamma Ray Bursts (LGRBs) encodes the evolution, across cosmic times, of their progenitors' properties and of their environment. The LGRB formation rate and the luminosity function, with its redshift evolution, are derived by reproducing the largest set of observations collected in the last four decades, namely the observer-frame prompt emission properties of GRB samples detected by the Fermi and Compton Gamma Ray Observatory (CGRO) satellites and the redshift, luminosity and energy distributions of flux-limited, redshift complete, samples of GRBs detected by Swift. The model that best reproduces all these constraints consists of a GRB formation rate increasing with redshift , i.e. steeper than the star formation rate, up to followed by a decrease . On top of this, our model predicts also a moderate…
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Taxonomy
TopicsGamma-ray bursts and supernovae
