JWST imaging data used by the ULTIMATE deblending survey (DR1)

Here we present the ULTIMATE-deblending project, which
delivers self-consistent UV-to-Radio photometry for galaxies detected in deep JWST surveys, including both NIRCam and MIRI data. In this first paper, we release a 50-band photometric catalog spanning CFHT/U to JWST/MIRI F1800W, covering a total of 627.1 arcmin2 across two JWST/PRIMER fields. We detail the reduction of JWST imaging data, the photometric procedures, and the SED-
fitting methodology used to derive galaxy properties. Compared with photometry including only HST and JWST bands, the inclusion of deblended low-resolution photometry from ground-based telescopes improves the accuracy of photometric redshifts by ∼40%, while reducing the outlier fraction by ∼60%. This galaxy sample can serve as a key reference for statistical studies of galaxy formation and evolution in the early universe. All catalogs and JWST mosaics from the ULTIMATE-deblending project will be made publicly available.