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@ARTICLE{Archambault:316800,
      author       = {Archambault, S. and Archer, A. and Benbow, W. and Bird, R.
                      and Biteau, J. and Buchovecky, M. and Buckley, J. H. and
                      Bugaev, V. and Byrum, K. and Cerruti, M. and Chen, X. and
                      Ciupik, L. and Connolly, M. P. and Cui, W. and Eisch, J. D.
                      and Errando, M. and Falcone, A. and Feng, Q. and Finley, J.
                      P. and Fleischhack, H. and Fortin, P. and Fortson, L. and
                      Furniss, A. and Gillanders, G. H. and Griffin, S. and Grube,
                      J. and Gyuk, G. and Hütten, M. and Håkansson, N. and
                      Hanna, D. and Holder, J. and Humensky, T. B. and Johnson, C.
                      A. and Kaaret, P. and Kar, P. and Kelley-Hoskins, N. and
                      Kertzman, M. and Kieda, D. and Krause, Maria and Krennrich,
                      F. and Kumar, S. and Lang, M. J. and Maier, G. and McArthur,
                      S. and McCann, A. and Meagher, K. and Moriarty, P. and
                      Mukherjee, R. and Nguyen, T. and Nieto, D. and O’Faoláin
                      de Bhróit, A. and Ong, R. A. and Otte, A. N. and Park, N.
                      and Perkins, J. S. and Pichel, A. and Pohl, Martin and
                      Popkow, A. and Pueschel, E. and Quinn, J. and Ragan, K. and
                      Reynolds, P. T. and Richards, G. T. and Roache, E. and
                      Rovero, A. C. and Santander, M. and Sembroski, G. H. and
                      Shahinyan, K. and Smith, A. W. and Staszak, D. and
                      Telezhinsky, I. and Tucci, J. V. and Tyler, J. and Vincent,
                      S. and Wakely, S. P. and Weiner, O. M. and Weinstein, A. and
                      Williams, D. A. and Zitzer, B. and Fumagalli, M. and
                      Prochaska, J. X.},
      collaboration = {{VERITAS Collaboration}},
      title        = {{U}pper limits from five years of blazar observations with
                      the {VERITAS} {C}herenkov {T}elescopes},
      journal      = {The astronomical journal},
      volume       = {151},
      number       = {6},
      issn         = {1538-3881},
      address      = {Chicago, Ill.},
      publisher    = {Univ. of Chicago Press, Journals Division10693},
      reportid     = {PUBDB-2017-00198},
      pages        = {142},
      year         = {2016},
      note         = {(c) AAS. Post referee full text in progress.},
      abstract     = {Between the beginning of its full-scale scientific
                      operations in 2007 and 2012, the VERITAS Cherenkov telescope
                      array observed more than 130 blazars; of these, 26 were
                      detected as very-high-energy (VHE; E > 100 GeV) γ-ray
                      sources. In this work, we present the analysis results of a
                      sample of 114 undetected objects. The observations
                      constitute a total live-time of ~570 hr. The sample includes
                      several unidentified Fermi-Large Area Telescope (LAT)
                      sources (located at high Galactic latitude) as well as all
                      the sources from the second Fermi-LAT catalog that are
                      contained within the field of view of the VERITAS
                      observations. We have also performed optical spectroscopy
                      measurements in order to estimate the redshift of some of
                      these blazars that do not have spectroscopic distance
                      estimates. We present new optical spectra from the Kast
                      instrument on the Shane telescope at the Lick observatory
                      for 18 blazars included in this work, which allowed for the
                      successful measurement or constraint on the redshift of four
                      of them. For each of the blazars included in our sample, we
                      provide the flux upper limit in the VERITAS energy band. We
                      also study the properties of the significance distributions
                      and we present the result of a stacked analysis of the data
                      set, which shows a 4σ excess.},
      cin          = {$Z_THAT$},
      ddc          = {520},
      cid          = {$I:(DE-H253)Z_THAT-20210408$},
      pnm          = {613 - Matter and Radiation from the Universe (POF3-613)},
      pid          = {G:(DE-HGF)POF3-613},
      experiment   = {EXP:(DE-H253)VERITAS-20170101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000377990300009},
      doi          = {10.3847/0004-6256/151/6/142},
      url          = {https://bib-pubdb1.desy.de/record/316800},
}