[1] Rhein Westfal TH Aachen, Inst Phys 3, D-52056 Aachen, Germany
[2] Univ Adelaide, Dept Phys, Adelaide, SA 5005, Australia
[3] Univ Alaska Anchorage, Dept Phys & Astron, 3211 Providence Dr, Anchorage, AK 99508 USA
[4] Clark Atlanta Univ, CTSPS, Atlanta, GA 30314 USA
[5] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
[6] Georgia Inst Technol, Ctr Relativist Astrophys, Atlanta, GA 30332 USA
[7] Southern Univ, Dept Phys, Baton Rouge, LA 70813 USA
[8] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[9] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[10] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[11] Ruhr Univ Bochum, Fak Phys & Astron, D-44780 Bochum, Germany
[12] Univ Bonn, Inst Phys, Nussallee 12, D-53115 Bonn, Germany
[13] Univ Libre Bruxelles, Sci Fac CP230, B-1050 Brussels, Belgium
[14] Vrije Univ Brussel, Dienst ELEM, B-1050 Brussels, Belgium
[15] MIT, Dept Phys, Cambridge, MA 02139 USA
[16] Chiba Univ, Dept Phys, Chiba 2638522, Japan
[17] Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch 1, New Zealand
[18] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[19] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[20] Ohio State Univ, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA
[21] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
[22] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[23] Tech Univ Dortmund, Dept Phys, D-44221 Dortmund, Germany
[24] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[25] Univ Alberta, Dept Phys, Edmonton, AB T6G 2E1, Canada
[26] Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany
[27] Univ Geneva, Dept Phys Nucl & Corpulsculaire, CH-1211 Geneva, Switzerland
[28] Univ Ghent, Dept Phys & Astron, B-9000 Ghent, Belgium
[29] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[30] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[31] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
[32] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[33] Univ Wisconsin, Wisconsin IceCube Particle Astrophys Ctr, Madison, WI 53706 USA
[34] Johannes Gutenberg Univ Mainz, Inst Phys, Staudinger Weg 7, D-55099 Mainz, Germany
[35] Univ Mons, B-7000 Mons, Belgium
[36] Tech Univ Munich, D-85748 Garching, Germany
[37] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA
[38] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
[39] Yale Univ, Dept Phys, New Haven, CT 06520 USA
[40] Univ Oxford, Dept Phys, 1 Keble Rd, Oxford OX1 3NP, England
[41] Drexel Univ, Dept Phys, 3141 Chestnut St, Philadelphia, PA 19104 USA
[42] South Dakota Sch Mines & Technol, Dept Phys, Rapid City, SD 57701 USA
[43] Univ Wisconsin, Dept Phys, River Falls, WI 54022 USA
[44] Stockholm Univ, Oskar Klein Ctr, SE-10691 Stockholm, Sweden
[45] Stockholm Univ, Dept Phys & Astron, SE-10691 Stockholm, Sweden
[46] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea
[47] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada
[48] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA
[49] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA
[50] Penn State Univ, Dept Phys, University Pk, PA 16802 USA