3D-DASH: The Widest Near-infrared Hubble Space Telescope Survey

The 3D-Drift And SHift (3D-DASH) program is a \textit{Hubble Space Telescope} WFC3 F160W imaging and G141 grism survey of the equatorial COSMOS field. 3D-DASH extends legacy HST near-infrared spectroscopy to degree-scale swaths sky, enabling identification study distant galaxies ($z>2$) that are rare or in short-lived phases galaxy evolution at rest-frame optical wavelengths. Furthermore, when combined with existing ACS/F814W imaging, facilitates spatially-resolved studies stellar populations dust content intermediate-redshift ($0.5<z<2$) galaxies. Here we present reduced mosaic available community. Observed efficient DASH technique, comprises 1256 individual pointings, corresponding an area 1.35 deg$^2$ (1.43 1912 including archival data). median $5\sigma$ point-source limit $H_{160}$ 24.74 mag. We also provide tools determine local point spread function (PSF), create cutouts, explore image any location within footprint. widest \textit{HST}/WFC3 filter date, increasing extragalactic resolution by order magnitude.