The ESO Public Survey ATLAS with VST is targeting 4700 square degrees of the southern sky in u,g,r,i,z to depths comparable to those of the Sloan Digital Sky Survey SDSS (r~22). Its wide wavelength coverage, from the u- to z-band complements the VISTA VHS and VIKING Surveys in YJHK bands.

This fourth data release provides new stacked reduced images and associated source lists for the period Oct 2014 to July 2017 and reprocessed stacked reduced images, associated source lists and the band-merged catalogue from the beginning of observations in August 2011 to July 2017. DR4 data contain a global photometric calibration based on Gaia. The basic data reduction of the VST imaging was carried out at the Cambridge Astronomical Surveys Unit (CASU), while the band merged catalogue was produced by the Wide Field Astronomy Unit (WFAU) at Edinburgh. 

The data products are available from the ESO Archive Science Portal. More details about the release content can be found in the associated Phase 3 data release description. Moreover the band-merged catalogue data, containing 155 million records, can be queried via the dedicated Catalog Interface.