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dc.contributor.authorMargutti, R.
dc.contributor.authorChincarini, G.
dc.contributor.authorBernardini, M.G.
dc.contributor.authorZaninoni, E.
dc.contributor.authorMargutti, R.
dc.contributor.authorBerger, E.
dc.contributor.authorSoderberg, A.M.
dc.contributor.authorChincarini, G.
dc.contributor.authorGranot, J.
dc.contributor.authorGuidorzi, C.
dc.contributor.authorGehrels, N.
dc.contributor.authorStamatikos, M.
dc.contributor.authorStamatikos, M.
dc.contributor.authorZaninoni, E.
dc.date.accessioned2011-11-23T12:01:03Z
dc.date.available2011-11-23T12:01:03Z
dc.date.issued2011-11-01
dc.identifier.citationMargutti , R , Chincarini , G , Bernardini , M G , Zaninoni , E , Margutti , R , Berger , E , Soderberg , A M , Chincarini , G , Granot , J , Guidorzi , C , Gehrels , N , Stamatikos , M , Stamatikos , M & Zaninoni , E 2011 , ' X-ray flare candidates in short gamma-ray bursts ' , Monthly Notices of the Royal Astronomical Society , vol. 417 , no. 3 , pp. 2144-2160 . https://doi.org/10.1111/j.1365-2966.2011.19397.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 458460
dc.identifier.otherPURE UUID: a984e6b8-f6bf-4f8b-9e2e-49cd9730562f
dc.identifier.otherScopus: 80055112770
dc.identifier.urihttp://hdl.handle.net/2299/7096
dc.descriptionThe definitive version can be found at: http://onlinelibrary.wiley.com/ Copyright Royal Astronomical Society
dc.description.abstractWe present the first systematic study of X-ray flare candidates in short gamma-ray bursts (SGRBs) exploiting the large 6-year Swift data base with the aim to constrain the physical nature of such fluctuations. We find that flare candidates appear in different types of SGRB host galaxy environments and show no clear correlation with the X-ray afterglow lifetime; flare candidates are detected both in SGRBs with a bright extended emission in the soft γ-rays and in SGRBs which do not show such component. We furthermore show that SGRB X-ray flare candidates only partially share the set of observational properties of long GRB (LGRB) flares. In particular, the main parameter driving the duration evolution of X-ray variability episodes in both classes is found to be the elapsed time from the explosion, with very limited dependence on the different progenitors, environments, central engine lifetimes, prompt variability time-scales and energy budgets. On the contrary, SGRB flare candidates significantly differ from LGRB flares in terms of peak luminosity, isotropic energy, flare-to-prompt luminosity ratio and relative variability flux. However, these differences disappear when the central engine time-scales and energy budget are accounted for, suggesting that (i) flare candidates and prompt pulses in SGRBs likely have a common origin; (ii) similar dissipation and/or emission mechanisms are responsible for the prompt and flare emission in LGRBs and SGRBs, with SGRBs being less energetic albeit faster evolving versions of the long class. Finally, we show that in strict analogy to the SGRB prompt emission, flares candidates fall off the lag-luminosity relation defined by LGRBs, thus strengthening the SGRB flare-prompt pulse connection.en
dc.format.extent17
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsEmbargoed
dc.subjectgamma-ray burst: general
dc.subjectradiation mechanisms: non-thermal
dc.titleX-ray flare candidates in short gamma-ray burstsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.date.embargoedUntil2012-05-01
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=80055112770&partnerID=8YFLogxK
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2011-11-01
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2011.19397.x
rioxxterms.licenseref.startdate2012-05-01
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.date.embargo2012-05-01
herts.rights.accesstypeEmbargoed


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