1. Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
2. Department of Physics and Astronomy, West Virginia University, PO Box 6315, Morgantown, WV 26506, USA
3. Center for Gravitational Waves and Cosmology, Chestnut Ridge Building, Morgantown, WV 26505, USA
4. Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
5. Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
6. Physics Department, University of the Western Cape, Cape Town 7535, South Africa