  We report the results of a low frequency radio variability and slow transient
search using archival observations from the Very Long Array. We selected six
325 MHz radio observations from the spring of 2006, each centered on the
Spitzer-Space-Telescope Wide-area Infrared Extragalactic Survey (SWIRE) Deep
Field: 1046+59. Observations were spaced between 1 day to 3 months, with a
typical single-epoch peak flux sensitivity below 0.2 \mjb near the field
pointing center. We describe the observation parameters, data post-processing,
and search methodology used to identify variable and transient emission. Our
search revealed multiple variable sources and the presence of one, day-scale
transient event with no apparent astronomical counterpart. This detection
implies a transient rate of 1$\pm$1 event per 6.5 $\deg^2$ per 72 observing
hours in the direction of 1046+59 and an isotropic transient surface density
$\Sigma = 0.12 \deg^{-2}$ at 95% confidence for sources with average peak flux
density higher than 2.1 mJy over 12 hr.
