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The high extinction and extreme source crowding of the central regions of theMilky Way are serious obstacles to the study of the structure and stellarpopulation of the Galactic centre (GC). Existing surveys that cover the GCregion (2MASS, UKIDSS, VVV, SIRIUS) do not have the necessary high angularresolution. Therefore, a high-angular-resolution survey in the near infrared iscrucial to improve the state of the art. Here, we present the GALACTICNUCLEUScatalogue, a near infrared $JHK_s$ high-angular-resolution ($0.2''$) survey ofthe nuclear bulge of the Milky Way. We explain in detail the data reduction,data analysis, calibration, and uncertainty estimation of the GALACTICNUCLEUSsurvey. We assess the data quality comparing our results with previous surveys.We obtained accurate $JHK_s$ photometry for $\sim 3.3\times10^6$ stars in theGC detecting around 20 \% in $J$, 65 \% in $H,$ and 90 \% in $K_s$. The surveycovers a total area of $\sim0.3$ square degrees, which corresponds to $\sim6,000$ pc$^2$. The GALACTICNUCLEUS survey reaches 5\,$\sigma$ detections for $J\sim 22$ mag, $H \sim 21$ mag, and $K_s \sim 21$ mag. The uncertainties arebelow 0.05 mag at $J \sim 21$ mag, $H \sim 19$ mag, and $K_s \sim 18$ mag. Thezero point systematic uncertainty is $\lesssim0.04$ mag in all three bands. Wepresent colour-magnitude diagrams for the different regions covered by thesurvey.

astronomy and astrophysics

GALACTICNUCLEUS: A high-angular-resolution JHKs imaging survey of the  Galactic centre II. First data release of the catalogue and the most detailed  CMDs of the GC