The Karl G. Jansky Very Large Array Sky Survey (VLASS). Science Case and Survey Design

The Very Large Array Sky Survey (VLASS) is a synoptic, all-sky radio sky survey with a unique combination of
\nhigh angular resolution (≈2 5), sensitivity (a 1σ goal of 70 μJy/beam in the coadded data), full linear Stokes
\npolarimetry, time domain coverage, and wide bandwidth (2–4 GHz). The first observations began in 2017
\nSeptember, and observing for the survey will finish in 2024. VLASS will use approximately 5500 hr of time on the
\nKarl G. Jansky Very Large Array (VLA) to cover the whole sky visible to the VLA (decl. > −40°), a total of
\n33 885 deg2. The data will be taken in three epochs to allow the discovery of variable and transient radio sources.
\nThe survey is designed to engage radio astronomy experts, multi-wavelength astronomers, and citizen scientists
\nalike. By utilizing an “on the fly” interferometry mode, the observing overheads are much reduced compared to a
\nconventional pointed survey. In this paper, we present the science case and observational strategy for the survey,
\nand also results from early survey observations.

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