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We present infrared photometry of all 36 potential JWST calibrators for whichthere is archival Spitzer IRAC data. This photometry can then be used to informstellar models necessary to provide absolute calibration for all JWSTinstruments. We describe in detail the steps necessary to measure IRACphotometry from archive retrieval to photometric corrections. To validate ourphotometry we examine the distribution of uncertainties from all detections inall four IRAC channels as well as compare the photometry and its uncertaintiesto those from models, ALLWISE, and the literature. 75% of our detections havestandard deviations per star of all observations within each channel of lessthan 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 indifferences of our photometry with ALLWISE, and excellent agreement withliterature values (less than 3% difference) lending credence to our measuredfluxes. JWST is poised to do ground-breaking science, and accurate calibrationand cross-calibration with other missions will be part of the underpinnings ofthat science.

Spitzer IRAC observations of JWST calibration stars