HST Call for Proposals for Cycle 25
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Hubble Space Telescope Call for Proposals for Cycle 25 > Chapter 3: Proposal Categories > 3.1 Overview of Proposal Categories

3.1
HST observations can be requested with a General Observer (GO; Section 3.2) or a Snapshot (SNAP; Section 3.3) Proposal. A GO Proposal can be Small (Section 3.2.1), Medium (Section 3.2.2), Large (Section 3.2.3), Calibration (Section 3.2.4), Long-Term (Section 3.2.5), or Treasury (Section 3.2.6). Funding for projects that do not require new HST observations can be requested with an Archival Research (AR; Section 3.4) Proposal. An AR Proposal can be either a Regular AR (Section 3.4.1), a Legacy AR (Section 3.4.2), or a Theory (Section 3.4.4) Proposal. Proposals can request observing time on Chandra (Section 3.5), XMM-Newton (Section 3.6), NOAO telescopes (Section 3.7), and NRAO facilities (see Section 3.8) in conjunction with requests for HST observations. Mid-cycle proposals (see Section 3.9) may be submitted at any time, and will be reviewed twice in this cycle. Investigators may also request Director’s Discretionary (DD) time at any time for unanticipated and scientifically compelling astronomical observations (Section 3.10).

Hubble Space Telescope Call for Proposals for Cycle 25 > Chapter 3: Proposal Categories > 3.1 Overview of Proposal Categories

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