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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A comprehensive radio view of the extremely bright gamma-ray burst 130427A
Monthly Notices of the Royal Astronomical Society, Volume 444, No. 4, Year 2014
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Description
GRB 130427A was extremely bright as a result of occurring at lowredshift 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 InterferometryNetwork (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. © 2014 The Authors.
Authors & Co-Authors
van der Horst, Alexander J.
Netherlands, Amsterdam
Universiteit Van Amsterdam
Paragi, Zsolt
Netherlands, Dwingeloo
Joint Institute for Vlbi in Europe
de Bruyn, A. Ger
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Groningen
Kapteyn Instituut
Granot, Jonathan
Israel, Tel Aviv-yafo
Open University of Israel
Kouveliotou, Chryssa K.
United States, Washington, D.c.
National Aeronautics and Space Administration
Wiersema, Klaas
United Kingdom, Leicester
University of Leicester
Starling, Rhaana L.C.
United Kingdom, Leicester
University of Leicester
Curran, Peter A.
Australia, Perth
International Centre for Radio Astronomy Research
Wijers, Ralph A.M.J.
Netherlands, Amsterdam
Universiteit Van Amsterdam
Rowlinson, Antonia
Netherlands, Amsterdam
Universiteit Van Amsterdam
Anderson, Gemma E.
United Kingdom, Oxford
University of Oxford
United Kingdom, Southampton
University of Southampton
Fender, Robert P.
United Kingdom, Oxford
University of Oxford
United Kingdom, Southampton
University of Southampton
Yang, Jun
Netherlands, Dwingeloo
Joint Institute for Vlbi in Europe
Sweden, Gothenburg
Chalmers University of Technology
Ström, Richard G.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Statistics
Citations: 58
Authors: 14
Affiliations: 11
Identifiers
Doi:
10.1093/mnras/stu1664
ISSN:
00358711