Very Large Array Sky Survey (VLASS)

This page provides access to the Very Large Array Sky Survey (VLASS) data collection.

VLASS is a synoptic, all-sky radio survey with a unique combination of high angular resolution (≈2".5), sensitivity (a 1σ goal of 70 µJy/beam in the coadded data), full linear Stokes polarimetry, time domain coverage, and wide bandwidth (2–4 GHz). The first observations began in September 2017, and observing is projected to finish in 2024. VLASS uses approximately 5500 hours of time on the Karl G. Jansky Very Large Array (VLA) to cover the whole sky visible to the VLA (Declination > −40°), a total of 33 885 deg2. The data is taken in three epochs to allow the discovery of variable and transient radio sources.

Enhanced VLASS data products are provided as part of the Canadian Initiative for Radio Astronomy Data Analysis (CIRADA) program led by a consortium of Canadian universities, in partnership with NRAO and the Canadian Astronomy Data Centre (CADC), and funded by the Canada Foundation for Innovation.

To search for data products, use the Search for Data link at the left.


Papers based on VLASS observations should carry the following acknowledgement, preferably as a footnote to the title of the paper.

The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. CIRADA is funded by a grant from the Canada Foundation for Innovation 2017 Innovation Fund (Project 35999), as well as by the Provinces of Ontario, British Columbia, Alberta, Manitoba and Quebec.
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