  The Infrared Array Camera (IRAC) is one of three focal plane instruments on
board the Spitzer Space Telescope. IRAC is a four-channel camera that obtains
simultaneous broad-band images at 3.6, 4.5, 5.8, and 8.0 microns in two nearly
adjacent fields of view. We summarize here the in-flight scientific, technical,
and operational performance of IRAC.
