Science > Science Program

NRAO Science Program

NRAO observing proposal submission deadlines for North American facilities are the closest date to 01 February and 01 August that fall on a Wednesday each year. The February deadline (B semesters) applies to requests for observing time from 1 August–31 January; the August deadline (A semesters) applies to requests for time from 1 February–31 July.

The science programs for each semester are listed in the left column of this page. The GBT is only included between 2010A-2016B; see the Green Bank Observatory to view the science programs from 2017A and onward. The Large Proposal page summarizes the active and past Large proposals, and the Active Triggered Proposal page lists the active triggered proposals, including their expiration date.  VLA proposals that have been granted Director's Discretionary Time (DDT) are located on the Approved DDT Proposals page.  See the Proposal Finder Tool (PFT) to search cover sheets of proposals previously approved for time on NRAO telescopes.