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dc.contributor.authorWatson, D.
dc.contributor.authorHjorth, J.
dc.contributor.authorJakobsson, P.
dc.contributor.authorXu, D.
dc.contributor.authorFynbo, J.
dc.contributor.authorSollerman, J.
dc.contributor.authorThone, C.C.
dc.contributor.authorPedersen, K.
dc.date.accessioned2008-01-02T09:56:12Z
dc.date.available2008-01-02T09:56:12Z
dc.date.issued2006
dc.identifier.citationWatson , D , Hjorth , J , Jakobsson , P , Xu , D , Fynbo , J , Sollerman , J , Thone , C C & Pedersen , K 2006 , ' Are short y-ray bursts collimated GRB 050709, a flare but no break ' , Astronomy and Astrophysics , vol. 454 , pp. L123-L126 . https://doi.org/10.1051/0004-6361:20065380
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 144319
dc.identifier.otherPURE UUID: cec8442f-9657-4f3c-a5b8-c5dfd4073d7f
dc.identifier.otherdspace: 2299/1260
dc.identifier.otherScopus: 33746923013
dc.identifier.urihttp://hdl.handle.net/2299/1260
dc.descriptionOriginal article can be found at: http://www.aanda.org/--Copyright The European Southern Observatory (ESO) DOI : 10.1051/0004-6361:20065380
dc.description.abstractContext. From the small sample of afterglow lightcurves of short duration γ-ray bursts (GRBs), the decays are rapid, roughly following a power-law in time. It has been assumed that the afterglow emission in short GRBs is collimated in jets in the same way as in long GRBs. Aims. An achromatic break in a short GRB afterglow lightcurve would therefore be strong evidence in favour of collimation in short GRBs. Methods. We examine the optical lightcurve of the afterglow of the short GRB050709, the only short GRB where a jet break has been claimed from optical data. Results. We show that (1) the decay follows a single power-law from 1.4 to 19 days after the burst and has a decay index α = 1.73+0.11 −0.04; (2) that an optical flare at ∼10 days is required by the data, roughly contemporaneous with a flare in the X-ray data; and (3) that there is no evidence for a break in the lightcurve. Conclusions. This means that so far there is no direct evidence for collimation in the outflows of short GRBs. The available limits on the collimation angles in short GRBs now strongly suggest much wider opening angles than found in long GRBs.en
dc.language.isoeng
dc.relation.ispartofAstronomy and Astrophysics
dc.titleAre short y-ray bursts collimated GRB 050709, a flare but no breaken
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361:20065380
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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