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D'Ammando, F; Pucella, G; Raiteri, C M; Villata, M; Vittorini, V; Vercellone, S; Donnarumma, I; Longo, F; Tavani, M; Argan, A; Barbiellini, G; Boffelli, F; Bulgarelli, A; Caraveo, P; Cattaneo, P W; Chen, A W; Cocco, V; Costa, E; E Del Monte; De Paris, G; G Di Cocco; Evangelista, Y; Feroci, M; Ferrari, A; Froysland, T; Fuschino, F; Galli, M; Gianotti, F; Giuliani, A; Labanti, C; Lazzarotto, F; Lipari, P; Marisaldi, M; Mereghetti, S; Morselli, A; Pacciani, L; Pellizzoni, A; Perotti, F; Piano, G; Picozza, P; Pilia, M; Prest, M; Rapisarda, M; Rappoldi, A; Sabatini, S; Soffitta, P; Trifoglio, M; Trois, A; Vallazza, E; Zambra, A; Zanello, D; Aller, M F; Aller, H D; Arkharov, A A; Bach, U; Benitez, E; Berdyugin, A; Blinov, D A; Buemi, C S; Chen, W P; A Di Paola; G Di Rico; Dultzin, D; Fuhrmann, L; Gomez, J L; Gurwell, M A; Jorstad, S G; Heidt, J; Hiriart, D; Hsiao, H Y; Kimeridze, G; Konstantinova, T S; Kopatskaya, E N; Koptelova, E; Kurtanidze, O; Leto, P; Lindfors, E; Lopez, J M; Marscher, A P; McHardy, I M; Melnichuk, D A; Mommert, M; Mujica, R; Nilsson, K; Pasanen, M; Roca-Sogorb, M; Sorcia, M; Takalo, L O; Taylor, B; Trigilio, C; Troitsky, I S; Antonelli, L A; Colafrancesco, S; Cutini, S; Gasparrini, D; Pittori, C; Santolamazza, P; Verrecchia, F; Giommi, P; Salotti, L
arXiv.org, 09/2009Paper, Journal Article
We report the detection by the AGILE satellite of a rapid gamma-ray flare from the powerful gamma-ray quasar PKS 1510-089, during a pointing centered on the Galactic Center region from 1 March to 30 March 2008. This source has been continuosly monitored in the radio-to-optical bands by the GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT). Moreover, the gamma-ray flaring episode triggered three ToO observations by the Swift satellite in three consecutive days, starting from 20 March 2008. In the period 1-16 March 2008, AGILE detected gamma-ray emission from PKS 1510-089 at a significance level of 6.2-sigma with an average flux over the entire period of (84 +/- 17) x 10^{-8} photons cm^{-2} s^{-1} for photon energies above 100 MeV. After a predefined satellite re-pointing, between 17 and 21 March 2008, AGILE detected the source at a significance level of 7.3-sigma, with an average flux (E > 100 MeV) of (134 +/- 29) x 10^{-8} photons cm^{-2} s^{-1} and a peak level of (281 +/- 68) x 10^{-8} photons cm^{-2} s^{-1} with daily integration. During the observing period January-April 2008, the source also showed an intense and variable optical activity, with several flaring episodes and a significant increase of the flux was observed at millimetric frequencies. Moreover, in the X-ray band the Swift/XRT observations seem to show an harder-when-brighter behaviour of the source spectrum. The spectral energy distribution of mid-March 2008 is modelled with a homogeneous one-zone synchrotron self Compton emission plus contributions from inverse Compton scattering of external photons from both the accretion disc and the broad line region. Indeed, some features in the optical-UV spectrum seem to indicate the presence of Seyfert-like components, such as the little blue bump and the big blue bump.
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