Chapter 3:
Proposal Categories

3.1 Overview of Proposal Categories

3.2 General Observer (GO) Proposals

3.2.1 Small GO Programs

3.2.2 Medium GO Programs

3.2.3 Large GO Programs

3.2.4 Calibration GO Programs

3.2.5 Long-Term GO Programs

3.2.6 Treasury GO Programs

3.3 Snapshot (SNAP) Proposals

3.3.1 Characteristics of SNAPs

3.3.2 Calibration SNAP Programs

3.3.3 Guidelines for SNAP Programs

3.4 Archival Research (AR) Proposals

3.4.1 Regular AR Proposals

3.4.2 Legacy AR Proposals

3.4.3 Calibration AR Programs

3.4.4 Theory Proposals

3.4.5 Guidelines for AR Programs

3.4.6 Suggestions for AR Proposals

3.5 Joint HST-Chandra Observing Proposals

3.6 Joint HST-Spitzer Observing Proposals

3.7 Joint HST/XMM-Newton Observing Proposals

3.8 Joint HST-NOAO Observing Proposals

3.9 Director’s Discretionary (DD) Time Proposals