A comprehensive radio view of the extremely bright gamma-ray burst 130427A
MetadataShow full item record
GRB 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.
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Showing items related by title, author, creator and subject.
Herzog, A.; Norris, R.; Middelberg, E.; Seymour, Nick; Spitler, L.; Emonts, B.; Franzen, T.; Hunstead, R.; Intema, H.; Marvil, J.; Parker, Q.; Sirothia, S.; Hurley-Walker, Natasha; Bell, M.; Bernardi, G.; Bowman, J.; Briggs, F.; Cappallo, R.; Callingham, J.; Deshpande, A.; Dwarakanath, K.; For, B.; Greenhill, L.; Hancock, Paul; Hazelton, B.; Hindson, L.; Johnston-Hollitt, M.; Kapińska, A.; Kaplan, D.; Lenc, E.; Lonsdale, C.; McKinley, B.; McWhirter, S.; Mitchell, D.; Morales, M.; Morgan, E.; Morgan, J.; Oberoi, D.; Offringa, A.; Ord, S.; Prabu, T.; Procopio, P.; Udaya Shankar, N.; Srivani, K.; Staveley-Smith, L.; Subrahmanyan, R.; Tingay, Steven; Wayth, Randall; Webster, R.; Williams, A.; Williams, C.; Wu, C.; Zheng, Q.; Bannister, K.; Chippendale, A.; Harvey-Smith, L.; Heywood, I.; Indermuehle, B.; Popping, A.; Sault, R.; Whiting, M. (2016)Context: Infrared-faint radio sources (IFRS) are a class of radio-loud (RL) active galactic nuclei (AGN) at high redshifts (z 1:7) that are characterised by their relative infrared faintness, resulting in enormous ...
Wylezalek, D.; Galametz, A.; Stern, D.; Vernet, J.; De Breuck, C.; Seymour, Nick; Brodwin, M.; Eisenhardt, P.; Gonzalez, A.; Hatch, N.; Jarvis, M.; Rettura, A.; Stanford, S.; Stevens, J. (2013)We report the first results from the Clusters Around Radio-Loud AGN program, a Cycle 7 and 8 Spitzer Space Telescope snapshot program to investigate the environments of a large sample of obscured and unobscured luminous ...
Lynch, Christene; Murphy, T.; Ravi, V.; Hobbs, G.; Lo, K.; Ward, C. (2016)We report the results of a volume-limited survey using the Australia Telescope Compact Array to search for transient and quiescent radio emission from 15 Southern hemisphere ultracool dwarfs. We detect radio emission from ...