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      Fermi-LAT observations of the exceptional gamma-ray outbursts of 3C 273 in September 2009

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          Abstract

          We present the light curves and spectral data of two exceptionally luminous gamma-ray outburts observed by the Large Area Telescope (LAT) experiment on board Fermi Gamma-ray Space Telescope from 3C 273 in September 2009. During these flares, having a duration of a few days, the source reached its highest gamma-ray flux ever measured. This allowed us to study in some details their spectral and temporal structures. The rise and decay are asymmetric on timescales of 6 hours, 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 August 2009.

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          14 December 2010
          10.1088/2041-8205/714/1/L73
          1012.2980

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          The Astrophysical Journal Letters, Volume 714, Issue 1, pp. L73-L78 (2010)
          Corresponding authors: E. Massaro, enrico.massaro@uniroma1.it; G. Tosti, gino.tosti@pg.infn.it. 15 pages, 4 figures, published in The Astrophysical Journal Letters, Volume 714, Issue 1, pp. L73-L78 (2010)
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