  We present infrared photometry of all 36 potential JWST calibrators for which
there is archival Spitzer IRAC data. This photometry can then be used to inform
stellar models necessary to provide absolute calibration for all JWST
instruments. We describe in detail the steps necessary to measure IRAC
photometry from archive retrieval to photometric corrections. To validate our
photometry we examine the distribution of uncertainties from all detections in
all four IRAC channels as well as compare the photometry and its uncertainties
to those from models, ALLWISE, and the literature. 75% of our detections have
standard deviations per star of all observations within each channel of less
than three percent. The median standard deviations are 1.2, 1.3, 1.1, and 1.9%
in [3.6] - [8.0] respectively. We find less than 8% standard deviations in
differences of our photometry with ALLWISE, and excellent agreement with
literature values (less than 3% difference) lending credence to our measured
fluxes. JWST is poised to do ground-breaking science, and accurate calibration
and cross-calibration with other missions will be part of the underpinnings of
that science.
