000192777 001__ 192777 000192777 005__ 20240227162145.0 000192777 0247_ $$2arXiv$$aarXiv:1411.1439 000192777 0247_ $$2altmetric$$aaltmetric:2860583 000192777 0247_ $$2inspire$$ainspire:1326374 000192777 037__ $$aPUBDB-2014-04306 000192777 0881_ $$aarXiv:1411.1439 000192777 088__ $$2arXiv$$aarXiv:1411.1439 000192777 1001_ $$0P:(DE-HGF)0$$aAliu, E.$$b0$$eCorresponding Author 000192777 245__ $$aVERITAS Observations of the BL Lac Object PG 1553+113 000192777 260__ $$c2014 000192777 3367_ $$2DRIVER$$apreprint 000192777 3367_ $$028$$2EndNote$$aElectronic Article 000192777 3367_ $$0PUB:(DE-HGF)25$$2PUB:(DE-HGF)$$aPreprint$$bpreprint$$mpreprint$$s192777 000192777 3367_ $$2BibTeX$$aARTICLE 000192777 3367_ $$0PUB:(DE-HGF)15$$2PUB:(DE-HGF)$$aInternal Report$$mintrep 000192777 500__ $$aOA 000192777 520__ $$aWe present results from VERITAS observations of the BL Lac object PG 1553+113 spanning the years 2010, 2011, and 2012. The time-averaged spectrum, measured between 160 and 560\,GeV, is well described by a power law with a spectral index of $4.33 \pm 0.09$. The time-averaged integral flux above $200\,$GeV measured for this period was $(1.69 \pm 0.06) \times 10^{-11} \, \mathrm{ph} \, \mathrm{cm}^{-2} \, \mathrm{s}^{-1}$, corresponding to 6.9\% of the Crab Nebula flux. We also present the combined $\gamma$-ray spectrum from the Fermi Large Area Telescope and VERITAS covering an energy range from 100~MeV to 560~GeV. The data are well fit by a power law with an exponential cutoff at $\rm {101.9 \pm 3.2 \, \mathrm{GeV}} $. The origin of the cutoff could be intrinsic to PG~1553+113 or be due to the $\gamma$-ray opacity of our universe through pair production off the extragalactic background light (EBL). Given lower limits to the redshift of $\rm z \negthinspace > \negthinspace 0.395$ based on optical/UV observations of PG~1553+113, the cutoff would be dominated by EBL absorption. Conversely, the small statistical uncertainties of the VERITAS energy spectrum have allowed us to provide a robust upper limit on the redshift of PG 1553+113 of $z \negthinspace \leq \negthinspace 0.62$. A strongly-elevated mean flux of $(2.50 \pm 0.14) \times 10^{-11} \, \mathrm{ph} \, \mathrm{cm}^{-2} \, \mathrm{s}^{-1}$ (10.3\% of the Crab Nebula flux) was observed during 2012, with the daily flux reaching as high as $(4.44 \pm 0.71) \times 10^{-11} \, \mathrm{ph} \, \mathrm{cm}^{-2} \, \mathrm{s}^{-1}$ (18.3\% of the Crab Nebula flux) on MJD 56048. The light curve measured during the 2012 observing season is marginally inconsistent with a steady flux, giving a $\chi^2$ probability for a steady flux of 0.03\%. 000192777 536__ $$0G:(DE-HGF)POF2-523$$a523 - High-energy gamma ray astronomy (POF2-523)$$cPOF2-523$$fPOF II$$x0 000192777 588__ $$aDataset connected to arXivarXiv 000192777 693__ $$0EXP:(DE-MLZ)NOSPEC-20140101$$5EXP:(DE-MLZ)NOSPEC-20140101$$eNo specific instrument$$x0 000192777 7001_ $$0P:(DE-HGF)0$$aArcher, A.$$b1 000192777 7001_ $$0P:(DE-HGF)0$$aAune, T.$$b2 000192777 7001_ $$0P:(DE-HGF)0$$aBarnacka, A.$$b3 000192777 7001_ $$0P:(DE-H253)PIP1013520$$aBehera, B.$$b4$$udesy 000192777 7001_ $$0P:(DE-HGF)0$$aBeilicke, M.$$b5 000192777 7001_ $$0P:(DE-HGF)0$$aBenbow, W.$$b6 000192777 7001_ $$0P:(DE-HGF)0$$aBerger, K.$$b7 000192777 7001_ $$0P:(DE-HGF)0$$aBird, R.$$b8 000192777 7001_ $$0P:(DE-HGF)0$$aBuckley, J. 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