The Infrared Array Camera Component of the Spitzer Space Telescope Extragalactic First Look Survey

We present Infrared Array Camera (IRAC) data and source catalogs from theSpitzer Space Telescope Extragalactic First Look Survey. The data were taken infour broad bands centered at nominal wavelengths of 3.6, 4.5, 5.8 and 8.0microns. A set of mosaics and catalogs have been produced which are ~80%complete and ~99% reliable to their chosen flux density limits. The main fieldsurvey covers 3.8 deg^2, and has flux density limits of 20muJy, 25muJy, 100muJyand 100muJy at wavelengths of 3.6, 4.5, 5.8 and 8.0 microns,respectively. Thedeeper ``verification'' survey covers 0.25 deg^2 with limits of 10muJy, 10muJy,30muJy and 30muJy, respectively. We also include deep data in the ELAIS-N1field which covers 0.041deg^2 with limits of 4muJy, 3muJy, 10muJy and 10muJy,respectively, but with only two wavelength coverage at a given sky position.The final bandmerged catalogs contain 103193 objects in the main field, 12224in the verification field and 5239 in ELAIS-N1. Flux densities of highsignal-to-noise objects are accurate to about 10%, and the residual systematicerror in the absolute flux density scale is ~2-3%. We have successfullyextracted sources at source densities as high as 1 deg^-2 in our deepest3.6 and 4.5 micron data. The mosaics and source catalogs will be made availablethrough the Spitzer Science Center archive and the Infrared Science Archive.