¹ Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA
² Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA
³ National Radio Astronomy Observatory, Charlottesville, VA 22903, USA
⁴ INAF—Osservatorio Astronomico di Cagliari, 09012 Capoterra, Italy
⁵ NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
⁶ University of Maryland, College Park, MD 20742, USA
⁷ Department of Physics, University of Washington, Seattle, WA 98195, USA
⁸ Australia Telescope National Facility, CSIRO, Epping, NSW 1710, Australia
⁹ CSIRO Parkes Observatory, Officer-in-Charge for life, Parkes, NSW 2870, Australia
¹⁰ Department of Physics, Stanford University, Stanford, CA 94305, USA
¹¹ Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Vic 3122, Australia
¹² Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, CA 95064, USA
¹³ CNRS/IN2P3, Centre d'Études Nucléaires de Bordeaux-Gradignan, Gradignan, 33175, France
¹⁴ Université de Bordeaux, Centre d'Études Nucléaires de Bordeaux-Gradignan, Gradignan, 33175, France
¹⁵ Department of Physics and Astronomy, Franklin and Marshall College, Lancaster, PA 17604, USA
¹⁶ NAIC, Arecibo Observatory, Arecibo, PR 00612, USA
¹⁷ MPIfR, 53121 Bonn, Germany
¹⁸ Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, UK
¹⁹ Eureka Scientific, Inc., Oakland, CA 94602, USA
²⁰ NRC Research Associate.