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Searches for slow radio transients and variables have generally focused onextragalactic populations, and the basic parameters of Galactic populationsremain poorly characterized. We present a large 3 GHz survey performed with theAllen Telescope Array (ATA) that aims to improve this situation: ASGARD, theATA Survey of Galactic Radio Dynamism. ASGARD observations spanned 2 years withweekly visits to 23 deg^2 in two fields in the Galactic Plane, totaling 900 hrof integration time on science fields and making it significantly larger thanprevious efforts. The typical blind unresolved source detection limit was 10mJy. We describe the observations and data analysis techniques in detail,demonstrating our ability to create accurate wide-field images whileeffectively modeling and subtracting large-scale radio emission, allowingstandard transient-and-variability analysis techniques to be used. We presentearly results from the analysis of two pointings: one centered on themicroquasar Cygnus X-3 and one overlapping the Kepler field of view (l =76{\deg}, b = +13.5{\deg}). Our results include images, catalog statistics,completeness functions, variability measurements, and a transient search. Outof 134 sources detected in these pointings, the only compellingly variable oneis Cygnus X-3, and no transients are detected. We estimate number counts forpotential Galactic radio transients and compare our current limits to previouswork and our projection for the fully-analyzed ASGARD dataset.

ASGARD: A Large Survey for Slow Galactic Radio Transients. I. Overview and First Results