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Research, (23) Universitat de Barcelona (ICC/IEEC), (24) Universit\\`a di Pisa, 25), (25) now at Ecole polytechnique f\\'ed\\'erale de Lausanne (EPFL), 26), (26) now at Department of Physics \\& Astronomy, 27), (27) now at Finnish Centre for Astronomy with ESO (FINCA), 28), (28) also at INAF-Trieste, 29), (29) also at Instituto de Fisica Teorica, (2) Universit\\`a di Udine, 30), 300 Jhongda Rd., (30) Now at Stockholms universitet, 31), (31) now at GRAPPA Institute, (32) Department of Physics, (33) Fred Lawrence Whipple Observatory, (34) Department of Physics, (35) School of Physics, (36) Santa Cruz Institute for Particle Physics, 37), (37) Institute of Physics, (38) Astronomy Department, (39) Department of Physics, (3) INAF National Institute for Astrophysics, 40129 Bologna, (40) Department of Physics, (41) School of Physics, (42) Department of Astronomy, (43) School of Physics, (44) Physics Department, (45) Department of Physics, (46) Department of Physics, (47) Department of Physics, (48) Department of Physics, (49) Department of Physics, (4) Universit\\`a di Siena, 50), (50) Saha Institute of Nuclear Physics, (51) School of Physics, 525 Davey Lab, (52) Department of Life, 53121 Bonn, (53) Department of Physics, (54) Physics Department, (55) Instituto de Astronomia y Fisica del Espacio, (56) Physics Department, (57) Department of Applied Physics, (58) Enrico Fermi Institute, (59) Argonne National Laboratory, (5) Croatian MAGIC Consortium, (60) INAF, (61) Space Sciences Laboratory, (62) ASI-Science Data Center, (63) Department of Astronomy, (64) Astron. Inst., 65, 65), (65) Pulkovo Observatory, 66), (66) Isaac Newton Institute of Chile, (67) Graduate Institute of Astronomy, 68), (68) Moscow M.V. Lomonosov State University, (69) Abastumani Observatory, (6) Max-Planck-Institut f\\\"ur Physik, 70, (70) Landessternwarte, (71) School of Cosmic Physics, (72) INAF - Osservatorio Astrofisico di Catania, (73) Aalto University Mets\\\"ahovi Radio Observatory Mets\\\"ahovintie 114 FIN-02540 Kylm\\\"al\\\"a Finland, 74), (74) Finnish Centre for Astronomy with ESO (FINCA) University of Turku V\\\"ais\\\"al\\\"antie 20 FIN-21500 Piikki\\\"o Finland, (75) INAF Istituto di Radioastronomia, (76) University of Trento, (77) Max-Planck-Institut f\\\"ur Radioastronomie, 78) ((1) IFAE, (78) Astro Space Center of the Lebedev Physical Institute, 79), (79) Engelhardt Astronomical Observatory, 7 Gauss Way, (7) Universidad Complutense, 837 State Street NW, (8) Inst. de Astrof\\'isica de Canarias, 9700 S. Cass Avenue, (9) University of Lodz, A. Babic (5), A. Biland (11), A. Bouvier (36), A. Carosi (3), A. Cesarini (76), A. De Angelis (2), Adler Planetarium, A. Dom\\'inguez (15, A. Falcone (42), A. Furniss (36), A. Gonz\\'alez Mu\\~noz (1), A. Hadamek (14), A. Herrero (8), A. La Barbera (3), A. Lahtenmaki (73), A. L\\'opez-Oramas (1), Amado, Ames, A. Moralejo (1), A. Niedzwiecki (9), Ann Arbor, A. N. Otte (51), A. O'Faol\\'ain de Bhr\\'oithe (35), A. Overkemping (14), A. Pichel (55), A. Popkow (49), Argentina, Argonne, A. Saggion (16), A. Sillanp\\\"a\\\"a (20), A. S Madhavan (48), A. Stamerra (3), Astronomy, Astronomy Museum, Astrophysics, Atlanta, A. Treves (17), Auf dem H\\\"ugel 69, A. Varlotta (39), A. W. Smith (47), AZ 85645, A. Zajczyk (32), Barnard College, B. De Lotto (2), Belfield, Berkeley, BG-1784 Sofia, Bishopstown, B. Jordan (71), B. Marcote (23), Bulgaria, B. Zitzer (59), (C1428ZAA) Ciudad Aut\\'onoma de Buenos Aires, CA 90095, CA 92521, CA 94307, CA 94720-7450, CA 95064, C. A. Johnson (36), California Polytechnic State University, Campus UAB, Canada, Casilla de Correo 67 - Sucursal 28, C. Delgado Mendez (13), C. Duke (40), Center for Relativistic Astrophysics, CERES-IEEC, C. Fruck (6), CH-8093 Zurich, Chicago, C. M. Raiteri (60), Columbia University, Como, Cork, Cork Institute of Technology, Croatia, C. S. Buemi (72), C. Schultz (16), C. Trigilio (72), D-15738 Zeuthen, D-44221 Dortmund, D-80805 M\\\"unchen, D-97074 W\\\"urzburg, D. A. Williams (36), D. Carreto Fidalgo (12), D. Dominis Prester (5), D. Dorner (12), DE 19716, D. Eisenacher (12), D. Elsaesser (12), Departament de F\\'isica, Department of Physics, DePauw University, D. Ferenc (5), D. F. Torres (19), D. Garrido Terrats (18), D. Hadasch (19), D. Hanna (44), D. Hildebrand (11), D. Hrupec (5), Division of Physics, D. Kieda (47), D. Lelas (5), D. Mazin (6), D. Nakajima (21), D. Nieto (54), D. Paneque (6, D. Sobczynska (9), D. Staszak (44), D. 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