“…Several LSP blazars are not detected in the X-ray band, as the X-ray emission of this type of objects is weak and their flux may easily be below the sensitivity of currently available observations. For similar reasons, HSPs with relatively high ν peak values might not be de-Radio/Fermi Catalogs X-ray Catalogs NVSS (Condon et al, 1998) XMMSL Dr2 Clean (Saxton et al, 2008) FIRST (White et al, 1997;Helfand et al, 2015) 3XMM Dr8 (Watson et al, 2009) SUMSS V2.1 (Manch et al, 2003) RASS 2RXS (Boller et al, 2016) CRATES (Healey et al, 2007) WGACAT2 (White et al, 2000) Fermi 4FGL (The Fermi-LAT collaboration, 2019) Swift 1SXPS (Evans et al, 2014) Fermi 3FHL (The Fermi-LAT collaboration, 2017) SDS82 (Brandt and Giommi, 2019 in preparation) Fermi 3FGL (Acero et al, 2015) Einstein IPC (Harris et al, 1990) 1BIGB SED (Arsioli et al, 2018) Einstein IPC slew survey (Munz, 1992) MST-9Y (Campana et al, 2018) BMW-HRI (Panzera et al, 2003) FermiMeV (Principe et al, 2018) Chandra (Evans et al, 2010) 2AGILE (Bulgarelli et al, 2019) Swift OUSXB (Giommi et al, 2019) Swift OUSXG (Giommi et al, 2019 in preparation) Blazar/Pulsar/GRB/Quasar Catalogs Cluster of galaxies Catalogs 5BZCat (Massaro et al, 2015) ZW CLUSTERS (Zwicky et al, 1968) 3HSP (Chang et al, 2019) PLANCK SZ2 (Planck Collaboration, 2016) ATNF PULSAR (Manchester et al, 2005) ABELL (Abell et al, 1989) Fermi 2PSR (The Fermi-LAT Collaboration, 2013) MCXC (Piffaretti et al, 2011) Fermi GRB (Ajello et al, 2019) SDSS WHL (Wen et al, 2009) Million Quasar (Flesch, 2015) SW XCS (Liu et al, 2015) VO conesearch in this step is set to same as the input radius, same as in the first phase. The GALEX data then are converted to monochromatic fluxes and de-reddened using Fitzpatrick (1999) extinction rule.…”