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Call for Open Community Comment on the VLASS Proposal

Posted: Tue Jan 27, 2015 1:21 pm
by smyers
The NRAO announces an open call for community public comment on the VLA Sky Survey (VLASS) proposal, prior to the VLASS Community Review that will take place March 4-6, 2015.

The Survey Science Group (SSG) and Science Working Groups have finalized the proposal for the VLA Sky Survey (VLASS) proposal ( ... _final.pdf), now available on the NRAO VLASS wiki. This version reflects revisions made to the survey definition in response to NRAO scientific and technical reviews, and is the version that will be evaluated by the upcoming VLASS Community Review. A revised and updated Technical Implementation Plan will also be posted shortly.

The period of open community comment on the VLASS proposal will extend through 22 February 2015. Comments on the proposal may be posted on this VLASS Forum (in response to this thread), and longer documents may be submitted through the VLASS Public Comment Submission web portal ( ... hite-paper) or sent via email to vlass AT All community input received during this period of open comment will be made available to the Community Review Panel.

See the Call for Comment webpage ( ... ite-papers) for more details.

Re: Call for Open Community Comment on the VLASS Proposal

Posted: Tue Feb 03, 2015 4:26 pm
by cchandle
The revised and updated VLASS Technical Implementation Plan is now also available at ... 150202.pdf.

Re: Call for Open Community Comment on the VLASS Proposal

Posted: Wed Feb 04, 2015 4:50 am
by adeller
OK, I'll start!

Whilst this is slightly beyond the purview of VLASS itself (more a question for NRAO management), I would like to note that I am strongly in favour of adjusting the durations of the different configurations, as suggested in the latest version of the Technical Implementation Plan, to ensure that the reduction in PI time is spread across all configurations. Leaving the configuration durations unaltered would be a big hit to B, A and especially BnA. (Side note: I hadn't heard that the hybrid configurations might potentially be eliminated from the normal cycle. If certain hybrids are underutilized in certain cycles, does it instead make sense to have a dynamic cycle, in which the included hybrids depends on the start date of the cycle? Again, not really a VLASS issue per se, except in that VLASS will make heavy use of BnA.)

Scheduling considerations: I believe that VLASS represents a really good opportunity to make the scheduling of the VLA slightly more flexible. For instance, being able to tag scheduling blocks as mutually exclusive, or as sequential, etc, is something that would be a great benefit to other PI science also and could make a modest but significant improvement to the efficiency of the array. For VLASS alone, weighed against the need for constant monitoring by an Astronomer on Duty (as suggested by the TIP) it sounds like the software effort to make such generalizations would be very well-justified if the local software engineering resources are available.

Re: Call for Open Community Comment on the VLASS Proposal

Posted: Thu Feb 12, 2015 2:06 pm
by jcondon
My comments on the VLASS proposal are now posted at
as file VLASScomments.pdf


Re: Call for Open Community Comment on the VLASS Proposal

Posted: Tue Feb 17, 2015 1:02 pm
by bgaensler
Hi Jim,

In response to your document:

One crucial way in which VLASS All-sky is transformative is in polarimetry: FIRST had no polarisation at all, and NVSS had very crude polarisation data from which one can only extract limited information.

Here the anticipated existence of EMU and WODAN is a huge bonus: the respective lambda^2 coverages are highly complementary. EMU and WODAN provide the "long baselines" and VLASS provides the "short spacings" in lambda^2 space, with all the consequent benefits. I note that recent papers such as Hales et al. (2014) and Rudnick & Owen (2014) discuss the extent to which polarised sources will be resolved or resolved out at high angular resolution.

In short: VLASS All-sky will provide a spectacular leap forward in our understanding of the polarised radio sky, which will be distinct from and highly complementary to the data provided by EMU and WODAN.

Note that the All-sky aspect is vital for polarimetry: the driver here is not the solid angle coverage, but the need to maximise the number of sources in various sub-categories.


Re: Call for Open Community Comment on the VLASS Proposal

Posted: Sat Feb 21, 2015 6:34 pm
by cchandle
Please see the VLASS wiki at for additional documents submitted during the period of open community comment.