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The absolute flux calibration of the James Webb Space Telescope will be basedon a set of stars observed by the Hubble and Spitzer Space Telescopes. In orderto cross-calibrate the two facilities, several A, G, and white dwarf (WD) starsare observed with both Spitzer and Hubble and are the prototypes for a set ofJWST calibration standards. The flux calibration constants for the four SpitzerIRAC bands 1-4 are derived from these stars and are 2.3, 1.9, 2.0, and 0.5%lower than the official cold-mission IRAC calibration of Reach et al. (2005),i.e. in agreement within their estimated errors of ~2%. The causes of thesedifferences lie primarily in the IRAC data reduction and secondarily in theSEDs of our standard stars. The independent IRAC 8 micron band-4 fluxes ofRieke et al. (2008) are about 1.5 +/- 2% higher than those of Reach et al. andare also in agreement with our 8 micron result.

Absolute Flux Calibration of the IRAC Instrument on the Spitzer Space Telescope using Hubble Space Telescope Flux Standards