A. ABDO, A.; ACKERMANN, Markus; AJELLO, Marco; BALDINI, Luca; BALLET, Jean; BARBIELLINI, Guido; BASTIERI, D.; BECHTOL, K.; BELLAZZINI, R.; BERENJI, B.; D. BLANDFORD, R.; D. BLOOM, E.; BONAMENTE, E.; W. BORGLAND, A.; BOUVIER, A.; BREGEON, J.; BREZ, A.; BRIGIDA, M.; BRUEL, Pascal; H. BURNETT, T.; BUSON, S.; A. CALIANDRO, G.; A. CAMERON, R.; CANNON, A.; CARAVEO, P. A.; CARRIGAN, S.; M. CASANDJIAN, J.; CAVAZZUTI, E.; CECCHI, C.; CELIK, O.; CHARLES, E.; CHEKHTMAN, A.; C. CHEUNG, C.; CHIANG, J.; CIPRINI, S.; CLAUS, R.; COHEN-TANUGI, J.; CONRAD, J.; COSTAMANTE, L.; D. DERMER, C.; DE ANGELIS, A.; DE PALMA, F.; DO COUTO E SILVA, E.; S. DRELL, P.; DUBOIS, R.; DUMORA, D.; FARNIER, C.; FAVUZZI, C.; J. FEGAN, S.; B. FOCKE, W.; FRAILIS, M.; FUKAZAWA, Y.; FUNK, S.; FUSCO, P.; GARGANO, F.; GASPARRINI, D.; GEHRELS, N.; GERMANI, S.; GIGLIETTO, N.; GIOMMI, P.; GIORDANO, F.; GLANZMAN, T.; GODFREY, G.; A. GRENIER, I.; GRONDIN, M.-H.; GUIRIEC, S.; HAYASHIDA, M.; HAYS, E.; B. HILL, A.; HORAN, D.; E. HUGHES, R.; JOHANNESSON, G.; S. JOHNSON, A.; N. JOHNSON, W.; KAMAE, T.; KATAGIRI, H.; KATAOKA, J.; KAWAI, N.; KNÖDLSEDER, Jürgen; KUSS, M.; LANDE, J.; LARSSON, S.; LATRONICO, L.; LEMOINE-GOUMARD, M.; LLENA GARDE, M.; LONGO, F.; LOPARCO, F.; LOTT, B.; N. LOVELLETTE, M.; LUBRANO, P.; M. MADEJSKI, G.; MAKEEV, A.; MANSUTTI, O.; MASSARO, E.; N. MAZZIOTTA, M.; MCCONVILLE, W.; E. MCENERY, J.; MEURER, C.; F. MICHELSON, P.; MITTHUMSIRI, W.; MIZUNO, T.; A. MOISEEV, A.; MONTE, C.; E. MONZANI, M.; MORSELLI, A.; V. MOSKALENKO, I.; MURGIA, S.; L. NOLAN, P.; P. NORRIS, J.; NUSS, E.; OHSUGI, T.; OMODEI, N.; ORLANDO, E.; F. ORMES, J.; PANEQUE, D.; H. PANETTA, J.; PELASSA, V.; PEPE, M.; PESCE-ROLLINS, M.; PIRON, F.; PORTER, T.A.; RAINO, S.; RANDO, R.; RAZZANO, M.; REIMER, A.; REIMER, O.; RITZ, S.; Y. RODRIGUEZ, A.; W. ROMANI, R.; ROTH, M.; RYDE, F.; F.-W. SADROZINSKI, H.; SANDER, A.; D. SCARGLE, J.; L. SCHALK, T.; SGRO, C.; J. SISKIND, E.; D. SMITH, P.; SPANDRE, G.; SPINELLI, P.; STARCK, Jean-Luc; S. STRICKMAN, M.; J. SUSON, D.; TAJIMA, H.; TAKAHASHI, H.; TAKAHASHI, T.; TANAKA, T.; B. THAYER, J.; G. THAYER, J.; J. THOMPSON, D.; TIBALDO, L.; F. TORRES, D.; TOSTI, G.; TRAMACERE, A.; UCHIYAMA, Y.; L. USHER, T.; VASILEIOU, V.; VILCHEZ, N.; VITALE, V.; P. WAITE, A.; WANG, P.; E. WEHRLE, A.; L. WINER, B.; S. WOOD, K.; YANG, Z.; YLINEN, T.; ZIEGLER, M.

doi:10.1088/2041-8205/714/1/L73

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The Astrophysical journal letters. 2010-05-01, vol. 714, p. L73-L78

Bristol : IOP Publishing

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We present the light curves and spectral data of two exceptionally luminous gamma-ray outbursts observed by the Large Area Telescope experiment on board the Fermi Gamma-ray Space Telescope from 3C 273 in 2009 September. During these flares, having a duration of a few days, the source reached its highest γ -ray flux ever measured. This allowed us to study, in some details, their spectral and temporal structures. The rise and the decay are asymmetric on timescales of 6 hr, and the spectral index was significantly harder during the flares than during the preceding 11 months. We also found that short, very intense flares put out the same time-integrated energy as long, less intense flares like that observed in 2009 August.< Réduire

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gamma rays: galaxies

quasars: individual (3C 273)

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Fermi Large Area Telescope observations of the exceptional gamma-ray outbursts of 3C 273 in 2009 september

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