Liu, T.T.Liu0000-0003-3096-9966TOZZI, PaoloPaoloTOZZI0000-0002-1688-482XTundo, E.E.Tundo0000-0001-6278-1576Moretti, A.A.Moretti0000-0003-0121-0723Rosati, P.P.RosatiWang, J. -X.J. -X.WangTAGLIAFERRI, GianpieroGianpieroTAGLIAFERRICAMPANA, SergioSergioCAMPANAGiavalisco, M.M.Giavalisco2020-04-242020-04-242015http://hdl.handle.net/20.500.12386/24239From the entire Swift XRT archive in the period 2005 February-2012 November, we select all the fields that can be used to build an unbiased, serendipitous X-ray cluster catalog.enDatabasehttp://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/ApJS/216/282015yCat..22160028LFIS/05 - ASTRONOMIA E ASTROFISICAScienze Fisiche Settori ERC (ERC) di riferimento::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation