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Call for Proposals and HST Primer
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Hubble Space Telescope Primer for Cycle 22 > Chapter 1: Introduction > 1.3 Resources, Documentation and Tools

1.3 Resources, Documentation and Tools
1.3.1 Phase I “Roadmap”
The Phase I Proposal Roadmap is a high level step-by-step guide to writing a Phase I Proposal. At each step, links are provided to relevant information.
1.3.2 Cycle 22 Announcement Webpage
The Cycle 22 Announcement webpage contains links to information needed for preparing a HST proposal. It also contains late-breaking updates regarding the Phase I process and a FAQ (frequently asked questions).
1.3.3 Cycle 22 Call for Proposals
The Call for Proposals discusses policies and procedures for submitting a Phase I proposal for HST observing or Archival Research. It also provides a summary of the proposal process from proposal submission to execution of the observations. The Call for Proposals document is available at the Cycle 22 Announcement webpage.
1.3.4 Instrument Handbooks
Instrument handbooks, the primary source of information for HST instruments, provide additional information beyond what’s presented in this Primer. Please use current versions of the handbooks when preparing the Phase I proposal. The latest handbook versions, for active and decommissioned instruments, are available at the HST Documents webpage. Other potentially useful documents, such as instrument science reports, data handbooks, and calibration conference proceedings are also accessible from that website.
1.3.5 The Astronomer’s Proposal Tool (APT)
and the Aladin Sky Atlas
The Astronomers Proposal Tool (APT) is the software interface for all Phase I and Phase II proposal submissions for HST. Please refer to the APT webpage for information regarding the installation and use of APT.
The Aladin Sky Atlas, available through APT, can be used to display HST apertures on images of the sky. This software interface provides access to a wide variety of images and catalogs; note that the GALEX catalog is available to assist in checking for potentially dangerous objects for the UV detectors. Training documentation and videos can be found on the APT Training Materials webpage.
1.3.6 Exposure Time Calculators (ETCs)
Information in this Primer, together with the instrument handbooks, provides the means for estimating acquisition times, exposure times, and other observational parameters. Values provided in document tables, or as illustrations, are only approximations; reliable calculations that take into account the complex telescope and instrument operation are best obtained using software tools provided by STScI, such as the Exposure Time Calculators (ETCs) and APT (Section 1.3.5). The ETCs, for example, provide warnings for target count rates that exceed saturation and safety limits. Note, however, that S/N predictions from the ETCs do not include the effects of degrading CTE (Charge Transfer Efficiency) for the CCD detectors.
Descriptions of the ETCs for active instruments, including determinations of exposure time as a function of instrument sensitivity and S/N ratio, are available in these documents: Chapter 9 of the ACS Instrument Handbook, Chapter 7 of the COS Instrument Handbook, Chapter 6 of the STIS Instrument Handbook, and Chapter 9 of the WFC3 Instrument Handbook.
1.3.7 HST Data Archive
The HST Data Archive, a part of the Mikulski Archive for Space Telescopes (MAST) at STScI, contains all the data taken by HST. Observations from General Observer (GO) and Guaranteed Time Observer (GTO) programs are available to the community upon the expiration of their proprietary periods. Observations taken by Treasury programs (see Section 3.2.5 of the Call for Proposals) and GO Pure Parallel programs (see Section 4.2.2 of the Call for Proposals) carry no proprietary period.
The MAST webpage provides an overview of the HST Data Archive as well as the procedures for retrieving archival data. Section 7.2 contains additional information about the HST Data Archive. A copy of the Archive that was maintained at the Space Telescope - European Coordinating Facility (ST-ECF) in Garching ceased operations on December 31st, 2010. The ESA Hubble Science Archive is now available at the European Space Astronomy Centre (ESAC) in Spain. The Canadian Astronomy Data Centre also maintains a copy of all public HST science data.
The HST Duplication Checking Web tool is also available at MAST. More information on duplication checking can be found in Section 5.2.2 of the Call for Proposals.
The Hubble Legacy Archive (HLA) is a project designed to enhance science from Hubble Space Telescope data by augmenting the HST Data Archive and providing advanced browsing capabilities. It is a joint project of the Space Telescope Science Institute, the Canadian Astronomy Data Centre (CADC), and, until December 2010, the European Coordinating Facility (ST-ECF). The HLA offers high level HST products including composite images, as well as interactive tools for previewing data products. Section 7.3 contains more detailed information about the HLA.
1.3.8 Data Reduction and Calibration
Introduction to the HST Data Handbooks is a general overview of HST data formats and software tools. It complements the instrument data handbooks that contain more details about calibration and data analysis. The latest versions of the instrument data handbooks are available at the Documents webpage.
The Space Telescope Science Data Analysis Software (STSDAS) webpage has links to the software used to calibrate and analyze HST data, along with documentation on its use. More details are available in Section 7.1. The DrizzlePac Handbook provides information about the DrizzlePac software package that has replaced MultiDrizzle in pipeline calibration and post-pipeline processing. Some information about dither patterns, drizzling, and various observing considerations are included in it, but for more detailed information, please refer to the Phase II Proposal Instructions and instrument handbooks.

Hubble Space Telescope Primer for Cycle 22 > Chapter 1: Introduction > 1.3 Resources, Documentation and Tools

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