Journal Article

The <i>Swift</i> short gamma-ray burst rate density: implications for binary neutron star merger rates

D. M. Coward, E. J. Howell, T. Piran, G. Stratta, M. Branchesi, O. Bromberg, B. Gendre, R. R. Burman and D. Guetta

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 425, issue 4, pages 2668-2673
Published in print October 2012 | ISSN: 0035-8711
Published online October 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21604.x
The Swift short gamma-ray burst rate density: implications for binary neutron star merger rates

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Short gamma-ray bursts (SGRBs) observed by Swift potentially reveal the first insight into cataclysmic compact object mergers. To ultimately acquire a fundamental understanding of these events requires pan-spectral observations and knowledge of their spatial distribution to differentiate between proposed progenitor populations. Up to 2012 April, there are only some 30 per cent of SGRBs with reasonably firm redshifts, and this sample is highly biased by the limited sensitivity of Swift to detect SGRBs. We account for the dominant biases to calculate a realistic SGRB rate density out to z ≈ 0.5 using the Swift sample of peak fluxes, redshifts and those SGRBs with a beaming angle constraint from X-ray/optical observations. We find an SGRB lower rate density of (assuming isotropic emission) and a beaming corrected upper limit of . Assuming a significant fraction of binary neutron star mergers produce SGRBs, we calculate lower and upper detection rate limits of (1–180) yr−1 by an Advanced LIGO (aLIGO) and Virgo coincidence search. Our detection rate is similar to the lower and realistic rates inferred from extrapolations using Galactic pulsar observations and population synthesis.

Keywords: gravitational waves; techniques: miscellaneous; gamma-ray burst: individual; stars: neutron

Journal Article.  5054 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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