1. School of Chemistry and Physics, University of KwaZulu–Natal, Durban 4000, South Africa
2. Department of Astronomy, University of California, Berkeley, California 94720, USA
3. School of Mathematics, Statistics, and Computer Science, University of KwaZulu–Natal, Durban 4000, South Africa
4. National Institute for Theoretical Physics, Durban 4000, South Africa
5. Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA
6. South African National Space Agency, Hermanus 7200, South Africa
7. Department of Physics and Electronics, Rhodes University, Grahamstown 6140, South Africa
8. South African Square Kilometre Array, Pinelands 7405, South Africa