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The Galaxy And Mass Assembly (GAMA) survey furnishes a deep redshift catalogthat, when combined with the Wide-field Infrared Explorer ($WISE$), allows usto explore for the first time the mid-infrared properties of $> 110, 000$galaxies over 120 deg$^2$ to $z\simeq 0.5$. In this paper we detail theprocedure for producing the matched GAMA-$WISE$ catalog for the G12 and G15fields, in particular characterising and measuring resolved sources; thecomplete catalogs for all three GAMA equatorial fields will be made availablethrough the GAMA public releases. The wealth of multiwavelength photometry andoptical spectroscopy allows us to explore empirical relations between opticallydetermined stellar mass (derived from synthetic stellar population models) and3.4micron and 4.6micron WISE measurements. Similarly dust-correctedHalpha-derived star formation rates can be compared to 12micron and 22micronluminosities to quantify correlations that can be applied to large samples to$z<0.5$. To illustrate the applications of these relations, we use the 12micronstar formation prescription to investigate the behavior of specific starformation within the GAMA-WISE sample and underscore the ability of WISE todetect star-forming systems at $z\sim0.5$. Within galaxy groups (determined bya sophisticated friends-of-friends scheme), results suggest that galaxies witha neighbor within 100$\,h^{-1} $kpc have, on average, lower specific starformation rates than typical GAMA galaxies with the same stellar mass.

Galaxy And Mass Assembly (GAMA): Mid-Infrared Properties and Empirical Relations from $WISE$