[1] Univ Arizona, Steward Observ, Tucson, AZ 85121 USA
[2] NYU, Dept Phys, Ctr Cosmol & Particle Phys, New York, NY 10003 USA
[3] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth P01 2EG, Hants, England
[4] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA
[5] Univ Penn, Dept Phys, Philadelphia, PA 19104 USA
[6] MIT, Dept Phys, Cambridge, MA 02139 USA
[7] Inst Adv Study, Sch Nat Sci, Princeton, NJ 08540 USA
[8] Univ Washington, Dept Astron, Seattle, WA 98195 USA
[9] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA
[10] Princeton Univ Observ, Princeton, NJ 08544 USA
[11] Apache Point Observ, Sunspot, NM 88349 USA
[12] CSIC, Inst Estudis Espacials Catalunya, E-08034 Barcelona, Spain
[13] Eotvos Lorand Univ, Dept Phys Complex Syst, H-1518 Budapest, Hungary
[14] Univ Tokyo, Sch Sci, Inst Astron, Tokyo 1810015, Japan
[15] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan
[16] Univ Chicago, Ctr Astron & Astrophys, Chicago, IL 60637 USA
[17] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[18] USN Observ, Flagstaff Stn, Flagstaff, AZ 86002 USA
[19] Univ Colorado, Ctr Astrophys & Space Astron, Boulder, CO 80803 USA
[20] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[21] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
[22] Univ Edinburgh, Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland
[23] Rochester Inst Technol, Dept Phys, Rochester, NY 14623 USA
[24] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
[25] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA
[26] Univ Tokyo, Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan
[27] Adler Planetarium, Chicago, IL 60605 USA
[28] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA