Author affiliations
1
Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA
2
Physics Department, McGill University, Montreal, QC H3A 2T8, Canada
3
Department of Physics, Washington University, St. Louis, MO 63130, USA
4
Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645, USA
5
School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
6
Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA
7
Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA
8
Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA; hughd@iastate.edu
9
Institute of Physics and Astronomy, University of Potsdam, D-14476 Potsdam-Golm, Germany
10
DESY, Platanenallee 6, D-15738 Zeuthen, Germany
11
Physics Department, California Polytechnic State University, San Luis Obispo, CA 94307, USA
12
Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605, USA
13
Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
14
Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027, USA
15
Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA
16
School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
17
Department of Physics, California State University—East Bay, Hayward, CA 94542, USA
18
School of Physics, National University of Ireland Galway, University Road, Galway, Ireland
19
Department of Physics and Astronomy and the Bartol Research Institute, University of Delaware, Newark, DE 19716, USA; jholder@physics.udel.edu
20
Department of Physics and Space Science, Florida Institute of Technology, W. Melbourne, FL 32901, USA
21
Physics Department, Columbia University, New York, NY 10027, USA
22
Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064, USA
23
Department of Physics and Astronomy, University of Iowa, Van Allen Hall, Iowa City, IA 52242, USA
24
Department of Physics and Astronomy, DePauw University, Greencastle, IN 46135-0037, USA
25
School of Physics and Center for Relativistic Astrophysics, Georgia Institute of Technology, 837 State Street NW, Atlanta, GA 30332-0430, USA
26
Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, USA
27
NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771, USA
28
Department of Physical Sciences, Cork Institute of Technology, Bishopstown, Cork, Ireland