*Who May Submit Proposals: Proposals may only be submitted by the following: -NSF Astronomy and Astrophysics Postdoctoral Fellowships are awards to individuals; proposals are submitted directly by the fellowship candidate to NSF. Each proposer must identify one or more scientific mentor(s) and host institution(s) at the time of proposal submission. Prospective Fellows may propose to hold the fellowship at: U.S. institutions of higher education, NSF-funded centers, facilities, or institutes,  U.S. non-profit organizations with research and educational missions, or International sites that are operated by U.S. organizations eligible for NSF funding, such as the Atacama Large Millimeter/submillimeter Array, Cerro Tololo InterAmerican Observatory, or Gemini South. National centers, facilities, sites, or institutes funded by other federal agencies, such as NASA or the U.S. Department of Energy, are ineligible as host institutions for the NSF AAPF Program. *Who May Serve as PI: Fellowships are awarded to individuals. The fellowship candidate submits their proposal directly to NSF.  An individual is eligible to submit a proposal to the NSF AAPF Program if all of the following criteria are met: The proposer is a citizen, national, or lawful permanent resident (Green Card Holder) of the United States. The proposer has earned the doctoral degree in an appropriate scientific field within five (5) years prior to the proposal submission deadline or will complete the doctoral degree by 1 October following the proposal deadline. By signing and submitting the proposal, the fellowship candidate is certifying that they meet the eligibility criteria specified in this program solicitation. Willful provision of false information in this request and its supporting documents or in reports required under an ensuing award is a criminal offense (U.S. Code, Title 18, Section 1001).

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