Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/33519
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dc.contributor.authorvan der Horst, A. J.-
dc.contributor.authorParagi, Z.-
dc.contributor.authorde Bruyn, A. G.-
dc.contributor.authorGranot, J.-
dc.contributor.authorKouveliotou, C.-
dc.contributor.authorWiersema, K.-
dc.contributor.authorStarling, R. L. C.-
dc.contributor.authorCurran, P. A.-
dc.contributor.authorWijers, R. A. M. J.-
dc.contributor.authorRowlinson, A.-
dc.contributor.authorAnderson, G. A.-
dc.contributor.authorFender, R. P.-
dc.contributor.authorYang, J.-
dc.contributor.authorStrom, R. G.-
dc.date.accessioned2015-11-10T11:59:13Z-
dc.date.available2015-11-10T11:59:13Z-
dc.date.issued2014-09-15-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society , 2014, 444 (4), pp. 3151-3163 (13)en
dc.identifier.issn0035-8711-
dc.identifier.urihttp://mnras.oxfordjournals.org/content/444/4/3151en
dc.identifier.urihttp://hdl.handle.net/2381/33519-
dc.description.abstractGRB 130427A was extremely bright as a result of occurring at low redshift whilst the energetics were more typical of high-redshift gamma-ray bursts (GRBs). We collected well-sampled light curves at 1.4 and 4.8 GHz of GRB 130427A with the Westerbork Synthesis Radio Telescope (WSRT); and we obtained its most accurate position with the European Very Long Baseline Interferometry Network (EVN). Our flux density measurements are combined with all the data available at radio, optical and X-ray frequencies to perform broad-band modelling in the framework of a reverse–forward shock model and a two-component jet model, and we discuss the implications and limitations of both models. The low density inferred from the modelling implies that the GRB 130427A progenitor is either a very low metallicity Wolf–Rayet star, or a rapidly rotating, low-metallicity O star. We also find that the fraction of the energy in electrons is evolving over time, and that the fraction of electrons participating in a relativistic power-law energy distribution is less than 15 per cent. We observed intraday variability during the earliest WSRT observations, and the source sizes inferred from our modelling are consistent with this variability being due to interstellar scintillation effects. Finally, we present and discuss our limits on the linear and circular polarization, which are among the deepest limits of GRB radio polarization to date.en
dc.language.isoenen
dc.publisherOxford University Press (OUP)en
dc.rightsThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.en
dc.subjectScience & Technologyen
dc.subjectPhysical Sciencesen
dc.subjectAstronomy & Astrophysicsen
dc.subjectgamma-ray burst: individual: GRB 130427Aen
dc.subjectGRB 130427Aen
dc.subjectINTERSTELLAR SCINTILLATIONen
dc.subjectCIRCULAR-POLARIZATIONen
dc.subjectCOLLISIONLESS SHOCKSen
dc.subjectQUASAR J1819+3845en
dc.subjectOPTICAL AFTERGLOWen
dc.subjectORDINARY MONSTERen
dc.subjectMAGNETIC-FIELDen
dc.subjectEMISSIONen
dc.subjectSTARSen
dc.titleA comprehensive radio view of the extremely bright gamma-ray burst 130427Aen
dc.typeJournal Articleen
dc.identifier.doi10.1093/mnras/stu1664-
dc.identifier.eissn1365-2966-
dc.description.statusPeer-revieweden
dc.description.versionPublisher Versionen
dc.type.subtypeArticle;Journal-
pubs.organisational-group/Organisationen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERINGen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomyen
dc.dateaccepted2014-08-12-
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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