1. National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411 007, India
2. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
3. SKA Organization, Jodrell Bank Observatory, Macclesfield, Cheshire, SK11 9DL, UK
4. Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA
5. Center for Gravitational Waves and Cosmology, West Virginia University, Chestnut Ridge Research Building, Morgantown, WV 26505, USA
6. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
7. ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, NL-7990 AA Dwingeloo, the Netherlands