HST Call for Proposals for Cycle 25
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Hubble Space Telescope Call for Proposals for Cycle 25 > Chapter 1: General Information > 1.2 New and Important Features of Cycle 25

1.2
Cycle 24 observations will end on September 30, 2017, and Cycle 25 will extend from October 1, 2017 to September 30, 2018. We will accept proposals for the following instruments: ACS, COS, FGS, STIS, and WFC3.
What’s New for Cycle 25
Large Joint HST-Chandra Programs: STScI and the Chandra X-ray Center (CXC) are collaborating to offer the opportunity to propose science programs that require substantial allocations of observing time on both observatories. CXC is providing up to 600 ksec of Chandra observing time to STScI that can be awarded to Large Joint HST-Chandra Programs, defined as programs that require at least 75 orbits of HST time and at least 400 ksec of Chandra observations. Similarly, CXC will be able to award up to 150 orbits for Large Programs submitted to the Chandra TAC. These allocations are in addition to the 400 ksec/100 orbits available for regular Joint HST-Chandra Programs. Large Joint HST-Chandra programs may be submitted for review to either the HST review or the Chandra review, but not to both (Section 3.5).
Budget submission deadline: Please note that the budget submission deadline for this cycle, August 10, 2017, is separate from the Phase II deadline, July 20, 2017.
Proprietary periods: The default proprietary period for data from Small and Medium GO programs is 6 months. Large, Treasury, and Calibration program data have no proprietary periods by default. Any request for non-zero proprietary periods for programs in these categories must be justified.
Important Features Carried Over From the Previous Cycle
JWST Preparatory proposals: STScI is encouraging the community to submit GO proposals for observations that complement and enhance the scientific impact of future JWST observations. Those proposals should be identified using the “JWST Preparatory Proposals” option in APT. Proposers should use the Special Requirements section for the PDF submission to describe the connection with specific JWST observations. The TAC will assess the proposals based on the potential impact of the full program, including both the HST observations and future JWST observations. Following the recommendation of the Space Telescope Users Committee, JWST Preparatory proposals will have a default proprietary period of zero months. Proposers may request a proprietary period; that request will be reviewed by the TAC. More details are given in Section 6.4.
Mid-Cycle proposals: Up to 200 orbits will be available for Mid-Cycle GO programs (see Section 3.9). Mid-Cycle programs were initiated in Cycle 23 to provide the community with an opportunity to propose for in-cycle observations of recently-discovered, non-transient objects. Mid-Cycle proposals may be submitted at any time, and are now limited to 10 orbits. Proposals received between March 1 and September 30, 2017 will be considered for implementation in the October 1, 2017 to March 31, 2018 time-frame; and those received between October 1, 2017 and January 31, 2018 will be considered for implementation in the April 1, 2018 to September 30, 2018 time-frame.
Proposal format: Following the recommendation of the Space Telescope Users Committee, printed copies of proposals will list investigators alphabetically without identifying the Principal Investigator. The PI will be appropriately identified on accepted proposals. Past HST Usage information is also no longer either requested or required in Phase I submissions.
Solar System and Exoplanet Proposals: The “Planets” mirror panels will review proposals covering exoplanet and debris disk science. Proposals for archival research/observations of Solar System targets will be reviewed by a separate panel.
Scientific Keywords: STScI has revised and updated the Scientific Keywords that are valid for use in the Phase I proposal templates. The revised list of keywords is given in Appendix B.
The Ultraviolet (UV) Initiative will continue in Cycle 25. This initiative is designed to take full advantage of the unique UV capabilities of Hubble while they still exist. Small, Medium, Large, and Treasury GO Proposals are all eligible, but SNAP Proposals are not. The available UV instrument modes include ACS/SBC imaging, COS spectroscopy, STIS/MAMA imaging and spectroscopy, STIS/CCD spectroscopy (UV gratings only) and WFC3/UVIS imaging (UV filters only; this does not include F336W, the U-band filter). The UV Initiative also extends to Archival (AR) Proposals, in the Regular AR (Section 3.4.1), Legacy AR (Section 3.4.2), and Theory (Section 3.4.4) categories. STScI will ask the review panels and the TAC to give particular consideration to UV-specific AR Proposals in the review process. More details are given in Section 6.3.
In Cycle 25, HST will offer joint proposals with the following other facilities: HST-NRAO (Section 3.8), Chandra (Section 3.5), XMM-Newton (Section 3.6), and NOAO telescopes (Section 3.7) as part of a proposal for HST observations.
The Hubble Source Catalog (HSC) combines tens of thousands of single visit-based WFC3, ACS, and WFPC2 source lists from the Hubble Legacy Archive (HLA) into a single master catalog with roughly 300 million individual sources, hence providing entry into the field of database astronomy. This resource may be used to support a wide range of new archival proposals, a few potential examples are listed in Section 7.4 of the HST Primer (e.g., variability over more than a 20 year lifetime in many cases, astrometry with better than 10 milli-arcsecond accuracy, cross-matching with a wide variety of catalogs). Version 2 of the Hubble Source Catalog was released in the fall of 2016. The primary changes are the addition of four years of ACS data and the cross matching of the HSC with spectral observations from COS, FOS and GHRS.
The MAST Data Discovery Portal (http://mast.stsci.edu/explore) is a one-stop Web interface to access data from all of MAST’s supported missions, including HST, Kepler, GALEX, FUSE, IUE, EUVE, and Swift-UVOT. In addition to data at MAST, users can search for data available through the Virtual Observatory (VO), either by providing a resolvable target name or coordinate, or by using the “Search the VO” button for a given MAST data product. The VO gives Portal users access to data spanning the electromagnetic spectrum, from radio to high energy, including images, spectra, catalogs, and NASA ADS records.
We remind users that an extensive catalog of High-Level Science Products (HLSPs) is hosted on the MAST archive HLSP webpage, including imaging and spectroscopic atlases of many classes of astronomical object. HLSPs are community-contributed, fully-processed images and spectra that are ready for scientific analysis. The HLSP catalog is a useful resource for preparing new proposals. In addition, agreeing to provide new HLSPs back to MAST can increase a proposal’s scientific value and hence its chance of success (this is a requirement for Treasury GO and Legacy AR Proposals).

Hubble Space Telescope Call for Proposals for Cycle 25 > Chapter 1: General Information > 1.2 New and Important Features of Cycle 25

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