1. Jodrell Bank Centre for Astrophysics, University of Manchester , Manchester M13 9PL, UK
2. Astronomy Unit, Queen Mary University of London , London E1 4NS, UK
3. Department of Physics and Astronomy, University of Western Cape , Cape Town 7535, South Africa
4. Department of Astronomy, University of California , Berkeley, CA 94720-3411, USA
5. South African Radio Astronomy Observatory, Black River Park , 2 Fir Street, Observatory, Cape Town 7925, South Africa
6. Department of Physics and Astronomy, University of Pennsylvania , Philadelphia, PA 19104-6396, USA
7. Cavendish Astrophysics, University of Cambridge , Cambridge Cavendish Astrophysics: CB3 OHE, UK
8. School of Earth and Space Exploration , Arizona State University, Tempe, AZ 85287-1404, USA
9. Department of Physics, Winona State University , Winona, MN 55987, USA
10. INAF-Istituto di Radioastronomia , via Gobetti 101, I-40129 Bologna, Italy
11. Department of Physics and Electronics, Rhodes University , PO Box 94, Grahamstown 6140, South Africa
12. National Radio Astronomy Observatory , Charlottesville, VA 22903, USA
13. Department of Physics, Brown University , Providence, RI 02096, USA
14. National Radio Astronomy Observatory , Socorro, NM 87801, USA
15. Radio Astronomy Lab, University of California , Berkeley, CA 94720-3411, USA
16. Department of Physics, University of California , Berkeley, CA 94720-3411, USA
17. Department of Physics and Astronomy, University of California , Los Angeles, CA 90095-1547, USA
18. National Radio Astronomy Observatory , Socorro, NM 87801-0387, USA
19. School of Physics, University of Melbourne , Parkville, VIC 3010, Australia
20. Department of Physics, University of Washington , Seattle, WA 98195-1560, USA
21. eScience Institute, University of Washington , Seattle, WA 98195-1560, USA
22. MIT Kavli Institute, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
23. Department of Physics, Massachusetts Institute of Technology , Cambridge, MA 02142, USA
24. Department of Physics and McGill Space Institute, McGill University , 3600 University Street, Montreal, QC H3A 2T8, Canada
25. Scuola Normale Superiore , I-56126 Pisa, Italy
26. Commonwealth Scientific and Industrial Research Organisation (CSIRO) , Space & Astronomy, P. O. Box 1130, Bentley, WA 6102, Australia
27. Center for Astrophysics, Harvard & Smithsonian , Cambridge, MA 02138, USA
28. American Astronomical Society , Washington, DC20006, USA