[1] Deutsch Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany
[2] Clemson Univ, Dept Phys & Astron, Kinard Lab Phys, Clemson, SC 29634 USA
[3] Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA
[4] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA
[5] Univ Calif Santa Cruz, Dept Phys, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA
[6] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
[7] Univ Pisa, I-56127 Pisa, Italy
[8] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy
[9] Univ Paris Diderot, Lab AIM, CEA IRFU, CNRS,Serv Astrophys,CEA Saclay, F-91191 Gif Sur Yvette, France
[10] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy
[11] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy
[12] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
[13] Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy
[14] NASA Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[15] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[16] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
[17] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy
[18] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy
[19] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
[20] Univ Turin, Dipartimento Fis Gen Amadeo Avogadro, I-10125 Turin, Italy
[21] Univ Montpellier, CNRS, IN2P3, Lab Universe & Particules Montpellier, F-34059 Montpellier, France
[22] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France
[23] CIFS, I-10133 Turin, Italy
[24] INAF Ist Astrofis Spaziale & Fis Cosm, I-20133 Milan, Italy
[25] ASI Sci Data Ctr, I-00133 Rome, Italy
[26] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy
[27] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy
[28] George Mason Univ, Coll Sci, Fairfax, VA 22030 USA
[29] INAF Osservatorio Astron Roma, I-00040 Rome, Italy
[30] Stockholm Univ, Dept Phys, AlbaNova, SE-10691 Stockholm, Sweden
[31] AlbaNova, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden
[32] Royal Swedish Acad Sci, SE-10405 Stockholm, Sweden
[33] INAF Ist Radioastron, I-40129 Bologna, Italy
[34] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy
[35] Univ Udine, Dipartimento Fis, I-33100 Udine, Italy
[36] Ist Nazl Fis Nucl, Sez Trieste, Grp Collegato Udine, I-33100 Udine, Italy
[37] Univ Telemat Pegaso, I-80132 Naples, Italy
[38] Univ Udine, I-33100 Udine, Italy
[39] Univ Politecnico Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy
[40] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[41] Hiroshima Univ, Dept Phys Sci, Higashihiroshima, Hiroshima 7398526, Japan
[42] Naval Res Lab, Div Space Sci, Washington, DC 20375 USA
[43] Univ N Florida, Dept Phys, Jacksonville, FL 32224 USA
[44] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England
[45] Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland
[46] Univ Tokyo, Grad Sch Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
[47] KTH Royal Inst Technol, AlbaNova, Dept Phys, SE-10691 Stockholm, Sweden
[48] Inst Space Sci IEEC CSIC, E-08193 Barcelona, Spain
[49] Univ Bordeaux 1, IN2P3, CNRS, Ctr Etud Nucl Bordeaux Gradignan, F-33175 Gradignan, France
[50] NRAO, Socorro, NM 87801 USA