1. Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
2. Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA
3. Center for Gravitational Waves and Cosmology, Chestnut Ridge Research Building, West Virginia University, Morgantown, WV 26506, USA
4. Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
5. Department of Electrical and Computer Engineering, Brigham Young University, Provo, UT 84602, USA
6. Arecibo Observatory, HC-3, Box 53995, Arecibo, PR 00612, USA