EDP Sciences
Free Access
Issue
A&A
Volume 453, Number 3, July III 2006
Page(s) 823 - 828
Section Extragalactic astronomy
DOI https://doi.org/10.1051/0004-6361:20054498
Published online 28 June 2006


A&A 453, 823-828 (2006)
DOI: 10.1051/0004-6361:20054498

The BATSE-Swift luminosity and redshift distributions of short-duration GRBs

D. Guetta1 and T. Piran2

1  Osservatorio astronomico of Rome, v. Frascati 33, 00040 Monte Porzio Catone, Italy
    e-mail: dafne@arcetri.astro.it
2  Racah Institute for Physics, The Hebrew University, Jerusalem 91904, Israel

(Received 9 November 2005 / Accepted 9 March 2006)

Abstract
We compare the luminosity function and rate inferred from the BATSE peak flux distribution of short hard bursts (SHBs) with the redshift and luminosity distributions of SHBs observed by Swift/HETE II. While the Swift/HETE II SHB sample is incompatible with the SHB population that follows the star formation rate, it is compatible with an SHB rate that reflects a distribution of delay times after the SFR. This would be the case if SHBs were associated with binary neutron star mergers. The available data allows, however, different interpretations. For example, a population whose rate is independent of the redshift fits the data very well. The implied SHB rates that we find range from ~8 to ~ 30 h703 Gpc-3 yr-1. This rate, which is comparable to the rate of neutron star mergers estimated from statistics of binary pulsars, is a much higher rate than what was previously estimated. We stress that our analysis, which is based on observed SHBs, is limited to bursts with luminosities above 1049 erg/s. Weaker bursts may exist, but if so they are hardly detected by BATSE of Swift, so their rate is very weakly constrained by current observations.


Key words: cosmology: observations -- gamma rays: bursts -- gravitational waves



© ESO 2006

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.