1. Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA
2. Department of Astronomy, University of California at Berkeley, 501 Campbell Hall #3411, Berkeley, CA 94720, USA
3. Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA
4. Department of Physics and Astronomy, Siena College, 515 Loudon Road, Loudonville, NY 12211, USA
5. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305, USA
6. Max-Planck-Institut für extraterrestrische Physik (MPE), Giessenbachstrasse 1, D-85748 Garching bei München, Germany
7. CEA, Centre de Saclay, IRFU/SPP, F-91191 Gif-sur-Yvette, France
8. Department of Physics and Astronomy, University of Utah, 115 S 1400 E, Salt Lake City, UT 84112, USA
9. Department of Physics, Center for Cosmology and Particle Physics, New York University, 726 Broadway, New York, NY 10003, USA
10. Institute of Physics, Laboratory of Astrophysics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland
11. Department of Astronomy and Space Science, Sejong University, 209, Neungdong-ro, Gwangjin-gu Seoul, South Korea