1. School of Physics & Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
2. Department of Astronomy, The Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
3. Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA
4. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305, USA
5. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
6. Department of Physics and Astronomy, College of Charleston, Charleston, SC 29424, USA
7. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
8. Clarendon Laboratory, University of Oxford, Parks Rd, Oxford OX1 3PU, UK
9. Department of Astronomy, University of Michigan, 1085 South University Ave., Ann Arbor, MI 48109, USA
10. Observatório Nacional, Rua Gal. José Cristino 77, Bairro Imperial de São Cristóvão, Rio de Janeiro 20921-400, Brazil
11. NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
12. Eureka Scientific, 2452 Delmer Street Suite 100, Oakland, CA 94602, USA
13. Department of Physics, The College of New Jersey, Ewing, NJ 08628, USA
14. Department of Physics, University of Arkansas, Fayetteville, AR 72701, USA
15. Purple Mountain Observatory, Chinese Academy of Sciences, 10 Yuanhua Road, Nanjing 210023, China
16. Center for Astrophysics|Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA
17. NASA Marshall Space Flight Center, Huntsville, AL 35812, USA
18. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
19. Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
20. Department of Astronomy, University of Maryland, College Park, MD 20742, USA
21. Institute for Advanced Study in Physics, Zhejiang University, Hangzhou 310058, China
22. Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
23. Joint Space-Science Institute (JSI), College Park, MD 20742, USA
24. Dipartimento di Fisica, Università degli Studi di Roma “Tor Vergata”, Via della Ricerca Scientifica 1, 00133 Roma, Italy
25. INAF—Osservatorio Astrofisico di Arcetri, Largo E. Fermi, 50122 Firenze, Italy
26. Department of Physics and Astronomy, University of Alabama in Huntsville, Huntsville, AL 35899, USA
27. Department of Physics, SUNY Brockport, Brockport, NY 14420, USA
28. Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL 60637, USA