Facilities > VLBA > Proposing > VLBA Proposal Preparation and Submission - Semester 2014B

VLBA Proposal Preparation and Submission - Semester 2014B

VLBA Proposal Preparation and Submission - Semester 2014B

2014B Call for Proposals

The 2014B Call for Proposals details the general capabilities being offered for the Very Long Baseline Array (VLBA).  Proposals for time on the VLBA need to be prepared using the Proposal Submission Tool (PST), which is also used to submit proposals for the Very Large Array (VLA) and the Green Bank Telescope (GBT).

In addition to these general capabilities, NRAO offers a VLBA Resident Shared Risk Observing (RSRO) program for those who would like to push the capabilities of the instrument beyond those offered for general use.  Details are available on the web at the VLBA RSRO Program page.

The NRAO Proposal Submission Tool (PST) is accessed via the NRAO Interactive Services.  The NRAO Proposal Submission Guide is available on-line in html and pdf formats. For a comprehensive description of the VLBA instrument we refer to the 2014B version of the VLBA Observational Status Summary (OSS).

For questions on the proposal submission process or problems with the NRAO PST please submit a ticket through the NRAO Helpdesk.

How to Propose

  1. Develop rationale: Before writing a proposal, the proposer must develop the scientific rationale for the program, develop a source list, decide on the observing band(s) to be used, and estimate the expected source strengths and their detectability. For spectral-line sources, the proposer also must decide on the desired velocity resolution, and convert that to a spectral resolution.
  2. Create Proposal in the Proposal Submission Tool (PST): After logging into NRAO Interactive Services, click on "Proposals" and then "New Proposal" on the top to the far right of the screen. Then Click on VLBA/HSA and "Create" (again on top to the far left). A proposal template will be created for you, click on the proposal number and this will open the proposal for you. There are eight screens to choose from and edit.
    1. General: Title, abstract, proposal type, etc.. You can edit this page by clicking on the "edit" button to top to the far left.
    2. Authors: List of authors and contact information. You can add an author by clicking on the "Add" button to the left on the page. Then search for your co-authors and if they are not in the database you can add them.
    3. Scientific Justification: Upload a pdf of your scientific justification, no more than 4 pages in length with an 11pt font.
    4. Sources: List of sources to observe. One slightly confusing thing here is that you have to create a "Source Group" to add sources. After creating a group you can either add sources to it by hand or search for them with NED/SIMBAD. Adding sources to this section does not mean any time has been requested for them, they must be linked to a telescope resource in Sessions.
    5. Resources: Resources requested from the VLBA (antennas, receivers, bit rates, correlator, etc.). If proposing for the VLBA then the "Socorro-DiFX" correlator should be used. Set which telescope are being requested and the set the "Observing Parameters" and "Correlation Parameters" based on the scientific goals of the project. For most continuum experiments you will want the highest sustainable aggregate bit rate (currently 2 Gbps; see the relevant section of the OSS), i.e., the largest bandwidth and therefore the highest sensitivity.  For spectral line use 2-bit samples, choose the number of baseband channels and their widths based on the expected frequency coverage of the lines, leaving some continuum on either side available for calibration, and use Nyquist sampling (two samples per hertz of bandwidth) except in the case of oversampling on very narrow bandwidths.
    6. Sessions: Describes the amount of time requested, and how it should be divided amongst the various sources and resources. Click on "New Session", this is where you actually request time on your sources at different frequencies.
    7. Student Support: Information for financial support requests for students at U.S. universities or colleges.
    8. Print Preview: Shows what the reviewer will see.
  3. Submit: Go back to "My Proposals" and click on the submit button () next to the proposal code.