EDP Sciences
Free access
Issue A&A
Volume 453, Number 3, July III 2006
Page(s) 823 - 828
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20054498



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

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.

Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

Mirror sites: CDS | EDP Sciences
  RSS feeds
© The European Southern Observatory (ESO)