Observational constraints on the nature of very short gamma-ray bursts

Abstract

We discuss a very peculiar subgroup of gamma-ray bursts among the BATSE sources. These bursts are very short ($T_{90}\le$0.1 s), hard, and came predominantly from a restricted direction of the sky (close to the Galactic anti-center). We analyze their arrival times and possible correlations, as well as the profiles of individual bursts. We find no peculiarities in the arrival times of Very Short Bursts (VSBs) despite their highly non-uniform spatial distribution. There is no dependence in the burst shapes on location. Bursts coming both from the burst-enhancement Galactic Anticenter region and from all other directions show considerable dispersion in their rise and fall times. Significant fraction of VSBs have multiple peaks despite their extremely short duration. Burst time properties are most likely to be consistent with two origin mechanisms: either with binary NS-NS mergers with low total masses passing through a phase of hypermassive neutron star, or with evaporation of the primordial black holes in the scenario of no photosphere formation.

25 pages, 14 figures; accepted to New Astronomy

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Cited by in corpus (7)

• Primordial black hole constraints with Hawking radiation -- a review
• Short vs. Long Gamma-Ray Bursts: A Comprehensive Study of Energetics and Prompt Gamma-Ray Correlations
• Primordial Black Holes: Observational Characteristics of The Final Evaporation
• Investigation of Redshift- and Duration-Dependent Clustering of Gamma-ray Bursts
• Estimation of compact binary coalescense rates from short gamma-ray burst redshift measurements
• Investigation of Primordial Black Hole Bursts using Interplanetary Network Gamma-ray Bursts
• Does Very Short Gamma Ray Bursts originate from Primordial Black Holes? Review