Hubble Space Telescope Call for Proposals for Cycle 17

9.3 Special Requirements

(This item is required only for GO and SNAP proposals)

List and justify any special scheduling requirements, including requests for:

• Target of Opportunity (TOO) observations. For TOO observations, estimate the probability of occurrence during Cycle 17, and state how soon HST must begin observing after the occurrence (see Section 4.1.2).
• CVZ observations (see Section 4.1.1).
• Time-critical observations (see Section 4.1.6).
• Early acquisition observations (see Section 5.2.1 of the HST Primer).
• Coordinated Parallel (CPAR) or Pure Parallel (PPAR) observations
• Target acquisitions that use the `Re-use target offset' function (see Section 5.2.2 of the HST Primer).
• Real-time interactions (see Section 4.1.7, and Section 2.5.1 of the HST Primer).
• Scheduling of STIS/MAMA and STIS/CCD observations (other than target acquisitions) in the same visit (see Section 6.2.3 of the HST Primer).
• Requests for expedited data access (see Section 7.2 of the HST Primer).
• Other special scheduling requirements (e.g., requests for non-SAA impacted observations).

Also, if applicable, discuss the benefits of or need for a non-default proprietary period request (see Section 5.1 and Section 8.7).

ACS and STIS proposals

Current plans for SM4 include potential refurbishments of ACS and STIS. Those repairs will be made on a best effort basis. Proposals that use ACS or STIS, in either prime or parallel mode, should use this section to describe alternative observing strategies should either instrument be unavailable. The discussion must include a summary of the impact on the proposal in terms of sensitivity, signal-to-noise, areal coverage and/or additional orbits required. The TAC will be asked to consider this information in rendering advice to the Director on whether accepted proposals should retain their ranking if either STIS or ACS is not available in Cycle 17.