[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, École Polytechnique, CNRS/IN2P3, 91128 Palaiseau, France
[11] Laboratoire D'Annecy-le-Vieux de Physique des Particules, Université de Savoie, CNRS/IN2P3, 74941 Annecy-le-Vieux, France
[12] Astroparticule et Cosmologie (APC), CNRS, Université Paris 7 Denis Diderot, 10 rue Alice Domon et Leonie Duquet, 75205 Paris Cedex 13, France
[13] Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
[14] Landessternwarte, Universität Heidelberg, Königstuhl, Heidelberg 69117, Germany
[15] Laboratoire de Physique Théorique et Astroparticules, Université Montpellier 2, CNRS/IN2P3, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
[16] Universität Erlangen-Nürnberg, Physikalisches Institut, Erwin-Rommel-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, Université Denis Diderot Paris 7, 4 Place Jussieu, 75252 Paris Cedex 5, France
[20] Charles University, Faculty of Mathematics and Physics, Institute of Particle and Nuclear Physics, V Holešovickách 2, 180 00, 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 Jagielloński, ul. Orla 171, 30-244 Kraków, Poland
[24] Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 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] Toruń Centre for Astronomy, Nicolaus Copernicus University, ul. Gagarina 11, 87-100 Toruń, Poland
[28] Instytut Fizyki JĄdrowej PAN, ul. Radzikowskiego 152, 31-342 Kraków, Poland
[29] Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
[30] Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck, 6020 Innsbruck, Austria
[31] Department of Physics, Oskar Klein Centre, Stockholm University, 10691 Stockholm, Sweden
[32] Oskar Klein Centre, Department of Physics, Royal Institute of Technology (KTH), 10691 Stockholm, Sweden
[33] European Associated Laboratory for Gamma-Ray Astronomy, Germany