IRAC HUDF and GOODS ultradeep surveys

The primary aim is to directly detect the infrared light of reionization epoch galaxies at z>7 and to constrain their stellar populations. The observations cover the Hubble Ultra Deep Field (HUDF), including the two HUDF parallel fields, and the CANDELS/GOODS-South, and are combined with archival data from all previous deep programs into one ultradeep data set.

The resulting imaging reaches unprecedented coverage in IRAC 3.6 and 4.5{mu}m ranging from >50hr over 150arcmin^2^, >100hr over 60sq arcmin^2^, to ~200hr over 5-10arcmin^2^. This paper presents the survey description, data reduction, and public release of reduced mosaics on the same astrometric system as the CANDELS/GOODS-South Wide Field Camera 3 (WFC3) data. To facilitate prior-based WFC3+IRAC photometry, we introduce a new method to create high signal-to-noise PSFs from the IRAC data and reconstruct the complex spatial variation due to survey geometry.