GRBs 070429B and 070714B: The High End of the Short-Duration Gamma-Ray Burst Redshift Distribution

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dc.creatorCenko, S. Bradley
dc.creatorBerger, Edo
dc.creatorNakar, Ehud
dc.creatorKasliwal, Mansi M.
dc.creatorCucchiara, Antonio
dc.creatorKulkarni, Shri R.
dc.creatorOfek, Eran
dc.creatorFox, Derek B.
dc.creatorHarrison, Fiona A.
dc.creatorRau, Arne
dc.creatorPrice, Paul A.
dc.creatorGal-Yam, Avishay
dc.creatorDopita, Michael A.
dc.creatorPenprase, Bryan E.
dc.date2008-02-07
dc.date.accessioned2026-07-07T09:19:13Z
dc.date.available2026-07-07T09:19:13Z
dc.descriptionWe present optical spectra of the host galaxies of the short-duration gamma-ray burst GRB 070429B and the likely short-duration with extended emission GRB 070714B. In both cases, we find a single emission line that we identify as O II lambda 3727 at z ~ 0.9. Both events are more distant than any previous short-duration GRB with a secure host association from the sub-arcsecond position of an optical afterglow. GRBs 070429B and 070714B provide strong evidence in support of our previous claims in Berger et al. that a significant fraction of short-duration hosts (>~ 33%) reside at z > 0.7. We discuss the implications of the existence this population on the energetics of short-duration GRBs, as well as on progenitor models. In the context of the degenerate binary merger scenario, such events require progenitor systems with a range of lifetimes and disfavor progenitor models with a long, narrow lifetime distribution.
dc.descriptionApJL submitted; 4 pages, 3 figures; Comments welcome
dc.identifierhttps://arxiv.org/abs/0802.0874
dc.identifierhttp://arxiv.org/abs/0802.0874
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/154308
dc.subjectAstrophysics
dc.titleGRBs 070429B and 070714B: The High End of the Short-Duration Gamma-Ray Burst Redshift Distribution
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