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The Very Large Array Sky Survey (VLASS) will survey then entire sky visible from the VLA in the 2-4 GHz radiocontinuum band. This 23,000 square degree survey will take place over 6 years, spanning three different observing epochs. VLASS will provide the widest view of the radio sky, revealing a rich population of galaxies, teasing out the role of the magnetic field, and hunting for hidden explosions hidden from optical telescope.

The VLASS Pilot Survey has been defined by NRAO and the SSG to cover ~2400 square degrees, and 200 hours has been allocated to these observations by the Time Allocation Committee and the NRAO Assistant Director for NM Operations. Test observations began in June 2017. NRAO staff are currently developing the specialized data reduction scripts required to image these data. products (calibrated visibility data, images) will be made available after undergoing quality assurance. The full survey will require up to 8000 hours and is undergoing final design review and approval.

CANFAR current activities

  • Development of infrastructure to support server-side visualization of large datacubes

Data & software needs and future plans

Bulding off the enhanced capabilities of the VLA, the VLASS data will provide nearly half a petabyte of imaging products, which require new tools for analysis.

  • Support for pipeline processing on cloud
  • Creation of advanced algorithms for source idenfitication, flux density monitoring, and polarization.
  • Machine learning applications applied to
  • Archive advanced data products


  • Project web page: https://science.nrao.edu/science/surveys/vlass
  • Node lead and contact: Erik Rosolowsky
  • People:
    • Erik Rosolowsky (University of Alberta): VLASS Data and Archiving Co-chair
    • Gregory Sivakoff (University of Alberta): VLASS Transient Working Group Co-Chair