H.E.S.S. CollaborationAbramowski, A.A.AbramowskiAcero, F.F.AceroTosti, G.G.TostiCavazzuti, ElisabettaElisabettaCavazzutiCutini, SaraSaraCutiniGasparrini, DarioDarioGasparriniGiommi, PaoloPaoloGiommi2020-09-172020-09-172011-09-01https://hdl.handle.net/20.500.13025/2099Astronomy & Astrophysics, Volume 533, id.A110The high-frequency peaked BL Lac object PKS 2005-489 was the target of a multi-wavelength campaign with simultaneous observations in the TeV gamma-ray (H.E.S.S.), GeV gamma-ray (Fermi/LAT), X-ray (RXTE, Swift), UV (Swift) and optical (ATOM, Swift) bands. This campaign was carried out during a high flux state in the synchrotron regime. The flux in the optical and X-ray bands reached the level of the historical maxima. The hard GeV spectrum observed with Fermi/LAT connects well to the very high energy (VHE, E > 100 GeV) spectrum measured with H.E.S.S.journal article10.1051/0004-6361/201016170http://adsabs.harvard.edu/abs/2011A&A...533A.110H2011A&A...533A.110H