Investigation of Redshift- and Duration-Dependent Clustering of Gamma-ray Bursts

Abstract

Gamma-ray bursts (GRBs) are detectable out to very large distances and as such are potentially powerful cosmological probes. Historically, the angular distribution of GRBs provided important information about their origin and physical properties. As a general population, GRBs are distributed isotropically across the sky. However, there are published reports that once binned by duration or redshift, GRBs display significant clustering. We have studied the redshift- and duration-dependent clustering of GRBs using proximity measures and kernel density estimation. Utilizing bursts detected by BATSE, Fermi/GBM and Swift/BAT, we found marginal evidence for clustering in very short duration GRBs lasting less than 100 ms. Our analysis provides little evidence for significant redshift-dependent clustering of GRBs.

Accepted to the Monthly Notices of the Royal Astronomical Society Journal (10 pages, 15 figures)

References in corpus (2)

• The Third Swift Burst Alert Telescope Gamma-Ray Burst Catalog
• On Estimating Non-uniform Density Distributions using N Nearest Neighbors

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