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Over the course of the cryogenic mission of the Spitzer Space Telescope, theresponsivity of the Red Peak-Up sub-array on the Infrared Spectograph (IRS)varied by ~2%, based on an analysis of five standard stars. The sensitivitydropped 1.7% after the first 14 IRS campaigns, then climbed back up 1.0% laterin the mission. The uncertainty in these measurements is better than ~0.3%. Therandom variations in the Peak-Up photometry of the standard stars has agaussian distribution of width ~2%, similar to the magnitude of the systematictemporal variations.

IRS-TR 11001: Temporal Responsivity Variations on the Red Peak-Up Sub-Array