[1] Rhein Westfal TH Aachen, Phys Inst 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] Univ Texas Arlington, Dept Phys, 502 Yates St,Sci Hall Rm 108,Box 19059, Arlington, TX 76019 USA
[5] Clark Atlanta Univ, CTSPS, Atlanta, GA 30314 USA
[6] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
[7] Georgia Inst Technol, Ctr Relativist Astrophys, Atlanta, GA 30332 USA
[8] Southern Univ, Dept Phys, Baton Rouge, LA 70813 USA
[9] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[10] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[11] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[12] Ruhr Univ Bochum, Fak Phys & Astron, D-44780 Bochum, Germany
[13] Univ Libre Bruxelles, Sci Fac, CP230, B-1050 Brussels, Belgium
[14] Vrije Univ Brussel VUB, Dienst ELEM, B-1050 Brussels, Belgium
[15] MIT, Dept Phys, Cambridge, MA 02139 USA
[16] Chiba Univ, Dept Phys, Chiba 2638522, Japan
[17] Chiba Univ, Inst Global Prominent Res, Chiba 2638522, Japan
[18] Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand
[19] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[20] Ohio State Univ, Dept Astron, 174 W 18Th Ave, Columbus, OH 43210 USA
[21] Ohio State Univ, Dept Phys, 174 W 18th Ave, Columbus, OH 43210 USA
[22] Ohio State Univ, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA
[23] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[24] TU Dortmund Univ, Dept Phys, D-44221 Dortmund, Germany
[25] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[26] Univ Alberta, Dept Phys, Edmonton, AB T6G 2E1, Canada
[27] Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany
[28] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany
[29] Univ Geneva, Dept Phys Nucl & Corpusculaire, CH-1211 Geneva, Switzerland
[30] Univ Ghent, Dept Phys & Astron, B-9000 Ghent, Belgium
[31] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[32] Karlsruhe Inst Technol, Inst Kernphys, D-76021 Karlsruhe, Germany
[33] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[34] SNOLAB, Creighton Mine 9,1039 Reg Rd 24, Lively, ON P3Y 1N2, Canada
[35] UCLA, Dept Phys & Astron, Los Angeles, CA 90095 USA
[36] Mercer Univ, Dept Phys, Macon, GA 31207 USA
[37] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
[38] Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA
[39] Univ Wisconsin, Wisconsin IceCube Particle Astrophys Ctr, Madison, WI 53706 USA
[40] Johannes Gutenberg Univ Mainz, Inst Phys, Staudinger Weg 7, D-55099 Mainz, Germany
[41] Marquette Univ, Dept Phys, Milwaukee, WI 53201 USA
[42] Westfalische Wilhelms Univ Munster, Inst Kernphys, D-48149 Munster, Germany
[43] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA
[44] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
[45] Yale Univ, Dept Phys, New Haven, CT 06520 USA
[46] Univ Oxford, Dept Phys, Parks Rd, Oxford OX1 3PU, England
[47] Drexel Univ, Dept Phys, 3141 Chestnut St, Philadelphia, PA 19104 USA
[48] South Dakota Sch Mines & Technol, Phys Dept, Rapid City, SD 57701 USA
[49] Univ Wisconsin, Dept Phys, River Falls, WI 54022 USA
[50] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA