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• W2231971710 startingPage "162" @default.
• W2231971710 abstract "A prominent outburst of the flat spectrum radio quasar 3C~454.3 was observed in 2014 June with the emph{Fermi} Large Area Telescope. This outburst was characterized by a three-stage light-curve pattern---plateau, flare and post-flare---that occurred from 2014 May to July, in a similar pattern as observed during the exceptional outburst in 2010 November. The highest flux of the outburst reported in this paper occurred during 2014 June 7--29, showing a multiple-peak structure in the light-curves. The average flux in these 22 days was found to be $F[E > 100~mathrm{MeV}] = (7.2 pm 0.2) times 10^{-6}$~ph~cm$^{-2}$~s$^{-1}$, with a spectral index, for a simple power law, of $Gamma = 2.04 pm 0.01$. That made this outburst the first $gamma$-ray high state of 3C~454.3 ever to be detected by emph{Fermi} with such a hard spectrum over several days. The highest flux was recorded on 2014 June 15, in a 3 hr bin, at MJD 56823.5625, at a level of $F[E > 100~mathrm{MeV}] = (17.6 pm 1.9) times 10^{-6}$~ph~cm$^{-2}$~s$^{-1}$. The rise time of one of the short subflares was found to be $T_r= 1200 pm 700$~s at MJD = 56827, when the flux increased from 4 to 12 $times 10^{-6}$~ph~cm$^{-2}$~s$^{-1}$. Several photons above 20 GeV were collected during this outburst, including one at 45 GeV on MJD 56827, constraining the $gamma$-ray emission region to be located close to the outer boundary of the broad-line region, leading to fast flux variability." @default.
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• W2231971710 date "2016-10-19" @default.
• W2231971710 modified "2023-10-03" @default.
• W2231971710 title "<i>FERMI</i>-LAT OBSERVATIONS OF THE 2014 MAY–JULY OUTBURST FROM 3C 454.3" @default.
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• W2231971710 doi "https://doi.org/10.3847/0004-637x/830/2/162" @default.
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