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024 7 _ |a 10.1088/0004-637X/799/1/7
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024 7 _ |a 1538-4357
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024 7 _ |a 10.3204/PUBDB-2016-00408
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024 7 _ |a arXiv:1411.1439
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088 _ _ |a arXiv:1411.1439
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100 1 _ |a Aliu, E.
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245 _ _ |a Veritas Observations of the BL LAC Object PG 1553+113
260 _ _ |a Chicago, Ill. [u.a.]
|c 2015
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336 7 _ |a article
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336 7 _ |a ARTICLE
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500 _ _ |a (c) The American Astronomical Society
520 _ _ |a We present results from VERITAS observations of the BL Lac object PG 1553+113 spanning the years 2010, 2011, and 2012. The time-averaged spectrum, measured between 160 and 560 GeV, is well described by a power law with a spectral index of 4.33 $\pm$ 0.09. The time-averaged integral flux above 200 GeV measured for this period was (1.69 $\pm$ 0.06) × $10^{–11}$ photons $cm^{–2} s^{–1}$, corresponding to 6.9% of the Crab Nebula flux. We also present the combined $\gamma$-ray spectrum from the Fermi Large Area Telescope and VERITAS covering an energy range from 100 MeV to 560 GeV. The data are well fit by a power law with an exponential cutoff at 101.9 $\pm$ 3.2 GeV. The origin of the cutoff could be intrinsic to PG 1553+113 or be due to the $\gamma$-ray opacity of our universe through pair production off the extragalactic background light (EBL). Given lower limits to the redshift of $\mathit{z} >$ 0.395 based on optical/UV observations of PG 1553+113, the cutoff would be dominated by EBL absorption. Conversely, the small statistical uncertainties of the VERITAS energy spectrum have allowed us to provide a robust upper limit on the redshift of PG 1553+113 of $\mathit{z} \le$ 0.62. A strongly elevated mean flux of (2.50 $\pm$ 0.14) × $10^{–11}$ photons $cm^{–2} s^{–1}$ (10.3% of the Crab Nebula flux) was observed during 2012, with the daily flux reaching as high as (4.44 $\pm$ 0.71) $10^{-11}$ photons $cm^{-2} s^{-1}$ (18.3% of the Crab Nebula flux) on MJD 56048. The light curve measured during the 2012 observing season is marginally inconsistent with a steady flux, giving a $\mathit{χ}$2 probability for a steady flux of 0.03%.
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