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Long-term monitoring of PKS 2155−304 with ATOM and H.E.S.S.: investigation of optical/<i>γ</i>-ray correlations in different spectral states
In this paper we report on the analysis of all the available optical and very high-energy $γ$-ray ($>$200 GeV) data for the BL Lac object PKS 2155$-$304, collected simultaneously with the ATOM and H.E.S.S. telescopes from 2007 until 2009. This study also includes X-ray (RXTE, Swift) and high-energy $γ$-ray (Fermi-LAT) …