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tokens: We thank an anonymous referee for several insightful comments that helped improve the content and presentation of this paper. We also thank J.-P. Macquart, R. M. Shannon, M. Bailes, and H. Knight for several useful discussions. This scientific work makes use of the Murchison Radio-astronomy Observatory operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. NDRB is supported by a Curtin Research Fellowship. Support for the operation of the MWA is provided by the Australian Government Department of Industry and Science and Department of Education (National Collaborative Research Infrastructure Strategy: NCRIS) under a contract to Curtin University administered by Astronomy Australia Limited. We acknowledge the iVEC Petabyte Data Store and the Initiative in Innovative Computing and the CUDA Center for Excellence sponsored by NVIDIA at Harvard University and support from the Centre for All-sky Astrophysics (CAASTRO) funded by grant CE110001020.