Observational evidence for a correlation between peak-luminosities and beaming in GRBs

Abstract

We calculate the unseen-but-true GRB-event rate from a current flux-limited sample of 33 GRBs with individually measured redshifts. We consider a GRB-event rate which is proportional to the star-formation rate, in view of the GRB-SNe association in SN1998bw and GRB030329. By fitting a log-normal distribution of GRB peak-luminosities, we find a ratio of about 450 for the true-to-observed GRB-event rates. This provides an independent derivation of the GRB-beaming factor of about 500 obtained by Frail et al. (2001) from sources with standard GRB-energies. We discuss applications to GRB980425.

to appear in ApJ Lett

References in corpus (22)

• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• A Flat Universe from High-Resolution Maps of the Cosmic Microwave Background Radiation
• How Massive Single Stars End their Life
• Discovery of the peculiar supernova 1998bw in the error box of GRB980425
• The High-Z Supernova Search: Measuring Cosmic Deceleration and Global Cur vature of the Universe Using Type Ia Supernovae
• MAXIMA-1: A Measurement of the Cosmic Microwave Background Anisotropy on angular scales of 10 arcminutes to 5 degrees
• Spectroscopic Discovery of the Supernova 2003dh Associated with GRB 030329
• Beaming in Gamma-Ray Bursts: Evidence for a Standard Energy Reservoir
• Are Gamma-Ray Bursts in Star Forming Regions?
• The unusual afterglow of GRB 980326: evidence for the gamma-ray burst/supernova connection
• Afterglow lightcurves, viewing angle and the jet structure of gamma-ray bursts
• On the Association of Gamma-ray Bursts with Massive Stars: Implications for Number Counts and Lensing Statistics
• Gamma-ray burst beaming: a universal configuration with a standard energy reservoir?
• The Expected Redshift Distribution of Gamma-Ray Bursts
• HST and Palomar Imaging of GRB 990123: Implications for the Nature of Gamma-Ray Bursts and their Hosts
• A Submillimeter and Radio Survey of Gamma-Ray Burst Host Galaxies: A Glimpse into the Future of Star Formation Studies
• Orphan GRB radio afterglows: Candidates and constraints on beaming
• Gamma-ray bursts and the history of star formation
• Light Curves and Spectra of Dust Echoes From Gamma-Ray Bursts and their Afterglows: Continued Evidence that GRB 970228 is Associated with a Supernova
• Probing the dark ages with redshift distribution of GRBs
• Luminosity Function of GRBs

Cited by in corpus (19)

• The Physics of Gamma-Ray Bursts
• Gamma-Ray Bursts: Progress, Problems & Prospects
• The Luminosity and Angular Distributions of Long GRBs
• Quasi-universal Gaussian jets: a unified picture for gamma-ray bursts and X-ray flashes
• A New, Faint Population of X-ray Transients
• A Search for Gravitational Waves Associated with the Gamma Ray Burst GRB030329 Using the LIGO Detectors
• Formation Rate, Evolving Luminosity Function, Jet Structure, and Progenitors for Long Gamma-Ray Bursts
• Physics of radiation mediated shocks and its applications to GRBs, supernovae, and neutron star mergers
• Gravitational radiation from gamma-ray bursts as observational opportunities for LIGO and VIRGO
• The Difference Between the Amati and Ghirlanda Relations
• On the Structure of Quasi-Universal Jets for Gamma-Ray Bursts
• Branching ratio of Type Ib/c supernovae into GRB-supernovae
• A cosmological "probability event horizon" and its observational implications
• Constraining the Structure of GRB Jets Through the log(N)-log(S) Distribution
• Prospects for true calorimetry on Kerr black holes in core-collapse supernovae and mergers
• High Energy Emission and Cosmic Rays from Gamma-Ray Bursts
• Proposed searches for candidate sources of gravitational waves in a nearby core-collapse supernova survey
• Line-broadening in gravitational radiation from gamma-ray burst-supernovae
• Supernovae Light Curves: An Argument for a New Distance Modulus