Spitzer mid-infrared point sources in the fields of nearby galaxies
  We present $Spitzer$ IRAC mid-infrared point source catalogs for mosaics
covering the fields of the nearby ($\lesssim$4 Mpc) galaxies NGC 55, NGC 253,
NGC 2366, NGC 4214, and NGC 5253. We detect a total of 20159 sources in these
five fields. Point spread function photometry was performed on sources detected
in both $Spitzer$ IRAC 3.6 $\mu$m and 4.5 $\mu$m bands at greater than
3$\sigma$ above background. These data were then supplemented by aperture
photometry in the IRAC 5.8 $\mu$m and 8.0 $\mu$m bands conducted at the
positions of the shorter wavelength sources. For sources with no detected
object in the longer wavelengths, we estimated magnitude limits based on the
local sky background. The individual galaxy point source breakdown is the
following: NGC 55, 8746 sources; NGC 253, 9001 sources; NGC 2366, 505 sources;
NGC 4214, 1185 sources; NGC 5253, 722 sources. The completeness limits of the
full catalog vary with bandpass and were found to be $m_{3.6}=18.0$,
$m_{4.5}=17.5$, $m_{5.8}=17.0$, and $m_{8.0}=16.5$ mag. For all galaxies, this
corresponds to detection of point sources brighter than $M_{3.6}=-10$. These
catalogs can be used as a reference for stellar population investigations,
individual stellar object studies, and in planning future mid-infrared
observations with the James Webb Space Telescope.
