The impact of selection biases on the correlation of gamma-ray bursts

  title={The impact of selection biases on the correlation of gamma-ray bursts},
  author={Giancarlo Ghirlanda and Gabriele Ghisellini and Lara Nava and Ruben Salvaterra and Gianpiero Tagliaferri and Simone Campana and Stefano Covino and Paolo D’Avanzo and Dino Fugazza and A. Melandri and S. D. Vergani Inaf - Osservatorio Astronomico di Brera and Apc Universite' Paris Diderot and Inaf-Iasf Milano},
  journal={Monthly Notices of the Royal Astronomical Society},
We study the possible effects of selection biases on the correlation caused by the unavoidable presence of flux limits in the existing samples of gamma-ray bursts (GRBs). We consider a well-defined complete sample of Swift GRBs and perform Monte Carlo simulations of the GRB population under different assumptions for their luminosity functions. If we assume that there is no correlation between the peak energy Epeak and the isotropic luminosity Liso, we are unable to reproduce it due to the flux… 

Figures and Tables from this paper

Gamma-ray Burst Prompt Correlations: Selection and Instrumental Effects
The prompt emission mechanism of gamma-ray bursts (GRB) even after several decades remains a mystery. However, it is believed that correlations between observable GRB properties given their huge
Constraining the intrinsic population of long gamma-ray bursts: Implications for spectral correlations, cosmic evolution, and their use as tracers of star formation
Long Gamma-Ray Bursts (LGRBs) have been shown to be powerful probes of the Universe, in particular to study the star formation rate up to very high redshift ($z \sim 9$). Since LGRBs are produced by
Dust extinctions for an unbiased sample of gamma-ray burst afterglows
In this paper, we compute rest-frame extinctions for the afterglows of a sample of Swift gamma-ray bursts (GRBs) complete in redshift. The selection criteria of the sample are based on observational
Probing the Gamma-Ray Burst Rate with Trigger Simulations of the Swift Burst Alert Telescope
The long gamma-ray burst (GRB) rate is essential for revealing the connection between GRBs, supernovae and stellar evolution. Additionally, the GRB rate at high redshift provides a strong probe of
A Multivariate Fit Luminosity Function And World Model For Long Gamma-Ray Bursts
It is proposed that the luminosity function, the rest-frame spectral correlations, and distributions of cosmological long-duration (Type-II) gamma-ray bursts (LGRBs) may be very well described as a
Radio afterglows of a complete sample of bright Swift GRBs: predictions from present days to the SKA era
Radio observations of Gamma Ray Bursts afterglows are fundamental in providing insights into their physics and environment, and in constraining the true energetics of these sources. Nonetheless,
The Ep − Eiso relation and the internal shock model
Context. The validity of the Ep − Eiso correlation in gamma-ray bursts and the possibility of explaining the prompt emission with internal shocks are highly debated questions. Aims. We study whether
The rate and luminosity function of long Gamma Ray Bursts
We derive, adopting a direct method, the luminosity function and the formation rate of long Gamma Ray Bursts through a complete, flux-limited, sample of Swift bursts which has a high level of
Counts of high-redshift GRBs as probes of primordial non-Gaussianities
We propose to use high-redshift long γ-ray bursts (GRBs) as cosmological tools to constrain the amount of primordial non-Gaussianity in the density field. By using numerical, N-body, hydrodynamic,
We propose a model for the spectral formation of gamma-ray burst (GRB) prompt emission, where the phenomenological Band function is usually applied to describe this emission. We suggest that the GRB


A complete sample of bright Swift long gamma-ray bursts: testing the spectral-energy correlations
We use a nearly complete sample of Gamma Ray Bursts (GRBs) detected by the Swift satellite to study the correlations between the spectral peak energy Epeak of the prompt emission, the isotropic
The Cosmic Rate, Luminosity Function, and Intrinsic Correlations of Long Gamma-Ray Bursts
We calculate durations and spectral parameters for 207 Swift bursts detected by the Burst Alert Telescope from 2007 April to 2009 August, including 67 events with measured redshifts. This is the
Time-resolved spectral correlations of long-duration γ-ray bursts
For a sample of long γ-ray bursts (GRBs) with known redshift, we study the distribution of the evolutionary tracks on the rest-frame luminosity-peak energy L iso - E' p diagram. We are interested in
Outliers to the peak energy–isotropic energy relation in gamma-ray bursts
The peak energy–isotropic energy (EpEi) relation is among the most intriguing recent discoveries concerning gamma-ray bursts (GRBs). It can have numerous implications for our understanding of the
The Epeak-Eiso plane of long Gamma Ray Bursts and selection effects
We study the distribution of long gamma-ray bursts in the Epeak‐Eiso and in the E obs ‐fluence planes through an updated sample of 76 bursts, with measured redshift and spectral parameters, detected
We present a carefully selected sub-sample of Swift long gamma-ray bursts (GRBs) that is complete in redshift. The sample is constructed by considering only bursts with favorable observing conditions
On The Origin Of High Energy Correlations in Gamma-ray Bursts
I investigate the origin of the observed correlation between a gamma-ray burst's (GRB's) νF ν spectral peak E pk and its isotropic equivalent energy E iso through the use of a population synthesis
Generalized Tests for Selection Effects in GRB High-Energy Correlations
Several correlations among parameters derived from modelling the high-energy properties of GRBs have been reported. We show that well-known examples of these have common features indicative of strong
Peak energy of the prompt emission of long gamma-ray bursts versus their fluence and peak flux
The spectral-energy (and luminosity) correlations in long gamma-ray bursts are being hotly debated to establish, first of all, their reality against possible selection effects. These are best studied
A complete catalog of Swift gamma-ray burst spectra and durations: Demise of a physical origin for pre-Swift high-energy correlations
We calculate durations and spectral parameters for 218 Swift bursts detected by the BAT instrument between and including gamma-ray bursts (GRBs) 041220 and 070509, including 77 events with measured