[1] Department of Physics and Astronomy, The Bartol Research Institute, University of Delaware, Newark,DE,19713, United States
[2] Department of Physics and Astronomy, University of Alabama, Tuscaloosa,AL,35487, United States
[3] Physics Department, Columbia University, New York,NY,10027, United States
[4] Department of Physics and Astronomy, DePauw University, Greencastle,IN,46135-0037, United States
[5] Department of Physics and Astronomy, The Bartol Research Institute, University of Delaware, Newark,DE,19716, United States
[6] Department of Physics and Astronomy, University of Utah, Salt Lake City,UT,84112, United States
[7] DESY, Platanenallee 6, Zeuthen,15738, Germany
[8] Center for Astrophysics, Harvard & Smithsonian, Cambridge,MA,02138, United States
[9] Physics Department, California Polytechnic State University, San Luis Obispo,CA,94307, United States
[10] Department of Physics, Washington University, St. Louis,MO,63130, United States
[11] School of Physics and Astronomy, University of Minnesota, Minneapolis,MN,55455, United States
[12] Department of Physics, California State University - East Bay, Hayward,CA,94542, United States
[13] Santa Cruz Institute for Particle Physics, Department of Physics, University of California, Santa Cruz,CA,95064, United States
[14] Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover,NH,03755, United States
[15] Department of Physics, University of Maryland, College Park,MD, United States
[16] NASA GSFC, Greenbelt,MD,20771, United States
[17] School of Natural Sciences, University of Galway, University Road, Galway,H91 TK33, Ireland
[18] Physics Department, McGill University, Montreal,QC,H3A 2T8, Canada
[19] School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
[20] Department of Physics and Astronomy, University of Iowa, Van Allen Hall, Iowa City,IA,52242, United States
[21] Department of Physics and Astronomy, Barnard College, Columbia University, NY,10027, United States
[22] Arthur B. McDonald Canadian Astroparticle Physics Research Institute, Queen’s University, 64 Bader Lane, Kingston,ON,K7L 3N6, Canada
[23] Department of Physics and Astronomy, University of California, Los Angeles,CA,90095, United States
[24] Department of Physics, Engineering Physics and Astronomy, Queen’s University, Kingston,ON,K7L 3N6, Canada
[25] Institute of Physics and Astronomy, University of Potsdam, Potsdam-Golm,14476, Germany
[26] Department of Physical Sciences, Munster Technological University, Bishopstown, Cork,T12 P928, Ireland
[27] Department of Physics and Astronomy, Purdue University, West Lafayette,IN,47907, United States
[28] Department of Physics, Indiana University, Purdue University Indianapolis, Indianapolis,IN,46202, United States
[29] Department of Physics and Astronomy, Iowa State University, Ames,IA,50011, United States
[30] Columbia Astrophysics Laboratory, Columbia University, New York,NY,10027, United States