L. Foschini, G. Bonnoli, G. Ghisellini, G. Tagliaferri, F. Tavecchio, A. Stamerra
We have reanalysed the giant outburst of the blazar PKS 1510-089 (z=0.36) occurred on 2011 October-November. The gamma-ray flux in the 0.1-100 GeV energy range exceeded the value of 10^-5 ph/cm2/s for several days. The peak flux was reached on 2011 October 19, with a value of 4.4 x 10^-5 ph/cm2/s, which in turn corresponds to a luminosity of 2 x 10^49 erg/s. Very short time scale variability was measured. Particularly, on 2011 October 18, the flux doubling time was as small as 20 minutes. This is the shortest variability ever detected in the MeV-GeV energy band. We compared the present analysis with two other outbursts observed in 2009 March and 2012 February-March, when the blazar was detected also by HESS and MAGIC, respectively, in order to infer information about the emission at hundreds of GeV.
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http://arxiv.org/abs/1304.2878
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