tokens: We thank Jamie Stevens for carrying out the ATCA observations. The Australia Telescope Compact Array is part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. 9 9 http://www.atnf.csiro.au/research/publications/Acknowledgements.html R.F.A. receives support from a Walter C. Sumner Memorial Fellowship. V.M.K. receives support from an NSERC Discovery Grant and Accelerator Supplement, Centre de Recherche en Astrophysique du Quebec, an R. Howard Webster Foundation Fellowship from the Canadian Institute for Advanced Study, the Canada Research Chairs Program and the Lorne Trottier Chair in Astrophysics and Cosmology. We thank M. Lyutikov, D. Tsang, and K. Gourgouliatos for useful discussions. We also thank an anonymous referee for comments that improved the manuscript. We acknowledge the use of public data from the Swift data archive. This research has made use of data and software provided by the High Energy Astrophysics Science Archive Research Center (HEASARC), which is a service of the Astrophysics Science Division at NASA/GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory. The scientific results reported in this article are based in part on observations made by the Chandra X-ray Observatory. This research has made use of CIAO software provided by the Chandra X-ray Center (CXC).
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