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We present the deepest Spitzer/IRAC $3.6$, $4.5$, $5.8$ and $8.0\mu$mwide-area mosaics yet over the GOODS-N and GOODS-S fields as part of the GOODSRe-ionization Era wide-Area Treasury from Spitzer (GREATS) project. We reducedand mosaicked in a self-consistent way observations taken by the 11 differentSpitzer/IRAC programs over the two GOODS fields from 12 years of Spitzercryogenic and warm mission data. The cumulative depth in the $3.6\mu$m and$4.5\mu$m bands amounts to $\sim 4260$ hr, $\sim 1220$ hr of which are new verydeep observations from the GREATS program itself. In the deepest area, thefull-depth mosaics reach $\gtrsim200$ hr over an area of $\sim100$ arcmin$^2$,corresponding to a sensitivity of $\sim29$ AB magnitude at $3.6\mu$m ($1\sigma$for point sources). Archival cryogenic $5.8\mu$m and $8.0\mu$m band data (acumulative 976 hr) are also included in the release. The mosaics are projectedonto the tangential plane of CANDELS/GOODS at a $0.3''$ pixel$^{-1}$ scale.This paper describes the methodology enabling, and the characteristics of, thepublic release of the mosaic science images, the corresponding coverage maps inthe four IRAC bands, and the empirical Point-Spread Functions (PSFs). ThesePSFs enable mitigation of the source blending effects by taking into accountthe complex position-dependent variation in the IRAC images. The GREATS dataproducts are in the Infrared Science Archive (IRSA). We also release thedeblended $3.6$-to-$8.0\mu$m photometry for $9192$ Lyman-Break galaxies at$z\sim3.5-10$. GREATS will be the deepest mid-infrared imaging until JWST and,as such, constitutes a major resource for characterizing early galaxy assembly.

the astrophysical journal. supplement series/astrophysical journal. supplement series

The Spitzer/IRAC Legacy over the GOODS Fields: Full-Depth 3.6, 4.5, 5.8  and 8.0um Mosaics and Photometry for > 9000 Galaxies at z~3.5-10 from the  GOODS Re-ionization Era wide-Area Treasury from Spitzer (GREATS)