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

A. A. Abdo Markus Ackermann Marco Ajello Luca Baldini Jean Ballet 1 Guido Barbiellini D. Bastieri K. Bechtol R. Bellazzini B. Berenji R. D. Blandford E. D. Bloom E. Bonamente A. W. Borgland A. Bouvier J. Bregeon 2 A. Brez M. Brigida Pascal Bruel 3 T. H. Burnett S. Buson G. A. Caliandro R. A. Cameron A. Cannon P. A. Caraveo S. Carrigan J. M. Casandjian 1 E. Cavazzuti C. Cecchi O. Celik E. Charles 1 A. Chekhtman C. C. Cheung J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi 4 J. Conrad L. Costamante 5 C. D. Dermer A. de Angelis F. de Palma E. Do Couto E Silva P. S. Drell R. Dubois D. Dumora 2 C. Farnier 4 C. Favuzzi S. J. Fegan 3 W. B. Focke M. Frailis Y. Fukazawa S. Funk P. Fusco F. Gargano D. Gasparrini N. Gehrels S. Germani N. Giglietto P. Giommi F. Giordano T. Glanzman G. Godfrey I. A. Grenier 1 M.-H. Grondin 2 S. Guiriec 4 M. Hayashida E. Hays A. B. Hill 6 D. Horan 3 R. E. Hughes G. Johannesson A. S. Johnson W. N. Johnson T. Kamae H. Katagiri J. Kataoka N. Kawai J. Knodlseder 5 M. Kuss J. Lande S. Larsson L. Latronico M. Lemoine-Goumard 2 M. Llena Garde F. Longo F. Loparco B. Lott 2 M. N. Lovellette P. Lubrano G. M. Madejski A. Makeev O. Mansutti E. Massaro M. N. Mazziotta W. Mcconville J. E. Mcenery C. Meurer P. F. Michelson W. Mitthumsiri T. Mizuno A. A. Moiseev C. Monte M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia P. L. Nolan J. P. Norris E. Nuss 4 T. Ohsugi N. Omodei E. Orlando J. F. Ormes D. Paneque J. H. Panetta V. Pelassa 4 M. Pepe M. Pesce-Rollins F. Piron 4 T.A. Porter S. Raino R. Rando M. Razzano A. Reimer O. Reimer S. Ritz A. Y. Rodriguez R. W. Romani M. Roth F. Ryde H. F.-W. Sadrozinski A. Sander J. D. Scargle 1 T. L. Schalk C. Sgro 3 E. J. Siskind P. D. Smith G. Spandre P. Spinelli Jean-Luc Starck 1 M. S. Strickman D. J. Suson H. Tajima H. Takahashi T. Takahashi T. Tanaka J. B. Thayer J. G. Thayer D. J. Thompson L. Tibaldo 1 D. F. Torres G. Tosti A. Tramacere Y. Uchiyama T. L. Usher V. Vasileiou N. Vilchez 5 V. Vitale A. P. Waite P. Wang A. E. Wehrle B. L. Winer K. S. Wood Z. Yang T. Ylinen M. Ziegler
Abstract : 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.
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A. A. Abdo, Markus Ackermann, Marco Ajello, Luca Baldini, Jean Ballet, et al.. Fermi Large Area Telescope observations of the exceptional gamma-ray outbursts of 3C 273 in 2009 september. The Astrophysical journal letters, Bristol : IOP Publishing, 2010, 714, pp.L73-L78. ⟨10.1088/2041-8205/714/1/L73⟩. ⟨in2p3-00483105⟩

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