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@ARTICLE{Aliu:293253,
      author       = {Aliu, E. and Archer, A. and Aune, T. and Barnacka, A. and
                      Behera, B. and Beilicke, M. and Benbow, W. and Berger, K.
                      and Bird, R. and Buckley, J. H. and Bugaev, V. and Byrum, K.
                      and Cardenzana, J. V and Cerruti, M. and Chen, X. and
                      Ciupik, L. and Connolly, M. P. and Cui, W. and Dickinson, H.
                      J. and Dumm, J. and Eisch, J. D. and Errando, M. and
                      Falcone, A. and Federici, S. and Feng, Q. and Finley, J. P.
                      and Fortin, P. and Fortson, L. and Furniss, A. and Galante,
                      N. and Gillanders, G. H. and Griffin, S. and Griffiths, S.
                      T. and Grube, J. and Gyuk, G. and Håkansson, N. and Hanna,
                      D. and Holder, J. and Hughes, Gareth and Humensky, T. B. and
                      Johnson, C. A. and Kaaret, P. and Kar, P. and Kertzman, M.
                      and Khassen, Y. and Kieda, D. and Krawczynski, H. and
                      Krennrich, F. and Kumar, S. and Lang, M. J. and Madhavan, A.
                      and McArthur, S. and McCann, A. and Meagher, K. and Millis,
                      J. and Moriarty, P. and Nieto, D. and O'Faoláin de
                      Bhróithe, A. and Ong, R. A. and Orr, M. and Otte, A. N. and
                      Park, N. and Perkins, J. S. and Pohl, Martin and Popkow, A.
                      and Prokoph, H. and Pueschel, E. and Quinn, J. and Ragan, K.
                      and Rajotte, J. and Reyes, L. C. and Reynolds, P. T. and
                      Richards, G. T. and Roache, E. and Sembroski, G. H. and
                      Shahinyan, K. and Staszak, D. and Telezhinsky, I. and Tucci,
                      J. V. and Tyler, J. and Varlotta, A. and Vassiliev, V. V.
                      and Wakely, S. P. and Weinstein, A. and Welsing, R. and
                      Wilhelm, Alina and Williams, D. A. and Zitzer, B.},
      title        = {{V}eritas {O}bservations of the {BL} {LAC} {O}bject {PG}
                      1553+113},
      journal      = {The astrophysical journal / 1},
      volume       = {799},
      number       = {1},
      issn         = {1538-4357},
      address      = {Chicago, Ill. [u.a.]},
      publisher    = {Univ.11032},
      reportid     = {PUBDB-2016-00408, arXiv:1411.1439},
      pages        = {7 -},
      year         = {2015},
      note         = {(c) The American Astronomical Society},
      abstract     = {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}$2 probability for a steady flux of 0.03\%.},
      cin          = {ZEU-EXP/AT},
      ddc          = {520},
      cid          = {$I:(DE-H253)ZEU-EXP_AT-20120731$},
      pnm          = {523 - High-energy gamma ray astronomy (POF2-523)},
      pid          = {G:(DE-HGF)POF2-523},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000348214500007},
      eprint       = {1411.1439},
      howpublished = {arXiv:1411.1439},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1411.1439;\%\%$},
      doi          = {10.1088/0004-637X/799/1/7},
      url          = {https://bib-pubdb1.desy.de/record/293253},
}