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In this paper, we present GALEX-SDSS-WISE Legacy Catalog (GSWLC), a catalogof physical properties (stellar masses, dust attenuations and star formationrates (SFRs)) of ~700,000 galaxies with SDSS redshifts below 0.3. GSWLCcontains galaxies within the GALEX footprint, regardless of a UV detection,covering 90% of SDSS. The physical properties were obtained from UV/optical SEDfitting following Bayesian methodology of Salim et al. (2007), withimprovements such as blending corrections for low-resolution UV photometry,flexible dust attenuation laws, and emission line corrections. GSWLC includesmid-IR SFRs derived from IR templates based upon 22 micron WISE observations.These estimates are independent of UV/optical SED fitting, in order to separatepossible systematics. The paper argues that the comparison of specific SFRs(SSFRs) is more informative and physically motivated than the comparison ofSFRs. SSFRs resulting from the UV/optical SED fitting are compared to themid-IR SSFRs, and to SSFRs from three published catalogs. For "main sequence"galaxies with no AGN contribution all SSFRs are in very good agreement (within0.1 dex on average). In particular, the widely-used aperture-corrected SFRsfrom MPA/JHU catalog show no systematic offsets, in contrast to someintegral-field spectroscopy results. For galaxies below the main sequence (logSSFR<-11), mid-IR (S)SFRs based on fixed luminosity-SFR conversion are severelybiased (up to 2 dex) because the dust is primarily heated by old stars.Furthermore, mid-IR (S)SFRs are overestimated by up to 0.6 dex for galaxieswith AGN, presumably due to non-stellar dust heating. UV/optical (S)SFRs arethus preferred to IR-based (S)SFRs for quenched galaxies and those which hostAGN.

GALEX-SDSS-WISE Legacy Catalog (GSWLC): Star Formation Rates, Stellar Masses and Dust Attenuations of 700,000 Low-redshift Galaxies