[1] Max-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany
[2] Yerevan Physics Institute, 2 Alikhanian Brothers St, 375036 Yerevan, Armenia
[3] Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, 9 Av. du Colonel Roche, 31029 Toulouse Cedex 4, France
[4] Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany
[5] Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
[6] LUTH, Observatoire de Paris, Université Paris Diderot, 5 Place Jules Janssen, 92190 Meudon, France
[7] IRFU/DSM/CEA, CE Saclay, 91191 Gif-sur-Yvette Cedex, France
[8] University of Durham, Department of Physics, South Road, Durham DH1 3LE, United Kingdom
[9] Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa
[10] Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, 91128 Palaiseau, France
[11] Laboratoire d'Annecy-le-Vieux de Physique des Particules, CNRS/IN2P3, 9 Chemin de Bellevue, 74941 Annecy-leVieux Cedex, France
[12] Astroparticule et Cosmologie (APC), CNRS, UMR 7164 (CNRS, Université Paris VII, CEA, Observatoire de Paris), 10, rue Alice Domon et Leonie, Duquel, 75205 Paris Cedex 13, France
[13] Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
[14] Landessternwarte, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany
[15] Laboratoire de Physique Théorique et Astroparticules, CNRS/IN2P3, Université Montpellier II, CC 70, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
[16] Universität Erlangen-Nürnberg, Physikalisches Institut, ErwinRommel-Str. 1, 91058 Erlangen, Germany
[17] Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
[18] Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
[19] LPNHE, Université Pierre et Marie Curie Paris 6, CNRS/IN2P3, 4 Place Jussieu, 75252 Paris Cedex 5, France
[20] Institute of Particle and Nuclear Physics, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic
[21] Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
[22] University of Namibia, Private Bag 13301, Windhoek, Namibia
[23] Obserwatorium Astronomiczne, Uniwersytet Jagiellonski, Krakow, Poland
[24] Nicolaus Copernicus Astronomical Centre, Warsaw, Poland
[25] School, of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
[26] School of Chemistry and Physics, University of Adelaide, Adelaide, 5005, Australia
[27] Tomun Centre for Astronomy, Nicolaus Copernicus University, Torun, Poland
[28] European Associated Laboratory for Gamma-Ray Astronomy, CNRS and MPG
[29] Stanford University, HEPL and KIPAC, Stanford, CA 94305-4085, United States
[30] Kavli Institute for Particle Astrophysics, SLAC, 2575 Sand Hill Road, Menlo Park, CA 94025, United States
[31] Université Bordeaux 1, CNRS/IN2P3, Chemin du Solarium, BP 120, 33175 Gradignan, France