11-Jun-04 1 Joseph Hora & the IRAC instrument team Harvard-Smithsonian Center for Astrophysics The Infrared Array Camera (IRAC) on the Spitzer Space Telescope 11-Jun-04 2 Outline overall behavior of detectors relative to pre- flight predictions, plus: a.) short wavelength response/qe issue; b.) cosmic ray effects; c.) latent images and their mitigation d.) implications of operation without a shutter; e.) effects when detectors are first turned on f.) status of absolute calibration 11-Jun-04 3 IRAC Description Infrared Array Camera Top-Level Requirements (Actual Performance) (Predicted) ChannelCenterTotalAngularField ofRelativeBroadband No.WavelengthBandwidthPixel SizeViewPhotometricSensitivity (microns)(%)(arcsec.)(arcmin.)Accuracy(5 sigma/200sec.) (max error %)( Jy) 1 (InSb)3.6 (3.55) 20 (21) 1.2 (1.210)5.12 x 5.12 (5.17 x 5.17) 2.0 (