HST Cycle 26 Guidelines and Checklist for Phase I Proposal Preparation

This page describes the formatting of Phase I proposals, the page limits for various types of proposals, and provides a checklist for proposers to consult when developing their observing proposals.

General Guidelines


The deadline for proposal submission is August 17th, 2018, 8pm EDT. Team Expertise and Background sections are due separately by email, by August 24, 2018. We strongly recommend that proposers start preparing their proposals early in order to give themselves enough time to learn APT. The Cycle 26 APT (26.0.1) will be made available May 14, 2018. If you need a version prior to the formal release, please send a request to the STScI Help Desk.

Please submit well before the deadline whenever possible, to avoid possible last-minute hardware or overloading problems, or network delays/outages. Late proposals will not be considered.

Questions about policies and technical issues should be addressed to the STScI Help Desk well before the deadline. While we attempt to answer all questions as rapidly as possible, we cannot guarantee a speedy response in the last week before the deadline.

Phase I Proposal Format

Cycle 26 Proposals must be submitted electronically. A Java-based software tool, APT (the Astronomer's Proposal Tool) is the interface for all Phase I and Phase II proposal submissions for HST.

A Phase I proposal consists of two parts:

Both are submitted to STScI directly from within APT. 

The "Team Expertise and Background" section should be emailed directly to the following email address, with the APT submission number, after the submission of the proposal. Email this document to hubblereview@stsci.edu. This document should be no more than one printed page.

Page Limits for PDF Attachment

There are page limits on the size of your PDF attachment. The table below outlines these limits for different proposal categories.

Table: Page Limits

Proposal Category1
Total Page Limit for PDF Attachment
Page Limit for the text of the Scientific Justification 
Medium GO
Large GO
Treasury GO
Legacy AR

1For Joint HST-Chandra, Joint HST/XMM-Newton, Joint HST-NOAO, and Joint HST-NRAO Proposals, users should determine whether their proposal is Medium or Large based on the HST orbit request, and use the appropriate page limits. Small Joint Proposals should follow the Medium Proposal page limit.

In relation to these page limits, note the following:

  • Proposals that exceed the page limits will be penalized in the review process; pages beyond the specified limits will be removed and will not be available to reviewers.
  • There are no limits on the numbers of figures and tables in the PDF attachment, and they may be interspersed in the text. However, the total page limit must be obeyed.
  • References should be listed at the end of the proposal and do not count against the page limits.
  • Your PDF attachment must be prepared with a font size of 12pt. Do not change the format of any of the templates provided by STScI.

Proposal Preparation Checklist

Table: Proposal Preparation Checklist 

1) Review the Phase I Roadmap
The HST Cycle 26 Roadmap is a high level step-by-step guide to writing a Phase I proposal. It includes links to various documents and training videos.
2) Install APT
Go to the APT webpage. Follow the instructions there to download and install the latest version of APT onto your machine. You can also ask your system administrator to do an institution-wide installation.
3) Fill out the APT Phase I form
Use APT to fill out the Phase I form. Information on the use of APT, including movie tutorials, is available on the APT webpage. A description of which items are requested as well as guidelines for answers are presented in HST Cycle 26 Filling Out the APT Proposal Form. Proposers can save work in progress, so APT submission can be completed over several sessions.
4) Download a template file for the creation of your PDF attachment
Go to the Cycle 26 Announcement webpage. Download one of the templates to create your PDF attachment. There are separate template files for GO and for AR/Theory Proposals. Template files are available in several popular word-processing applications, including LaTeX and Microsoft Word.
5) Edit the template
Edit the template using your favorite word-processing application. A description of which issues need to be discussed, and guidelines for how to discuss them, are presented in HST Cycle 26 Preparation of the PDF Attachment.
6) Create the PDF attachment.
Transform your edited template into a PDF file. Any figures in your proposal must be included into this PDF file. Go to the Cycle 26 Announcement webpage for instructions on how to create a PDF file from your edited template, and for instructions on how to include figures. We will provide the reviewers with the electronic PDF files so that figures can be viewed in color. However there is no guarantee that the reviewers will view the files electronically, so please make sure your figures are useful when printed using grey scales.
7) Anonymize the PDF attachmentEnsure that your PDF attachment containing your Scientific and Technical sections are sufficiently anonymized, in accordance with the specified guidelines.
8) Add the PDF filename path to the APT form
In your APT form, list in the appropriate box the path that points to the PDF attachment file on your local disk.
9) Review your proposal
In APT, click on ‘PDF Preview’ to get a preview of all the final information in your proposal. What you see is exactly what the reviewers who judge your proposal will see. If you are not satisfied, make any necessary changes.
10) Institutional Endorsement
STScI does not require institutional endorsement of GO/AR Proposals in Phase I. However, some institutions do require such endorsement of all submitted proposals. It is the responsibility of each PI to follow all applicable institutional policies concerning the submission of proposals.
11) Submit your proposal 
In APT, use the Submission tool to submit your proposal to STScI. All parts are sent together (i.e., both the APT form information and the PDF attachment).
12) Receive an STScI acknowledgment of your submission
Verification of a successful submission will appear in the Submission Log on the Submission Screen in APT within about a minute. Also, the PI and all Co-Is will receive an automatic email acknowledgment that the merged PDF submission was received successfully. After the Phase I deadline has passed, and all submissions are in their final form, you will receive final notification that your submission has been successfully processed; this email will mark the completion of the submission. If you do not receive the final notification email within 48 hours of the deadline, please contact the STScI Help Desk and provide the submission ID from the APT Submission Log window. If there are any problems associated with your PDF attachment, you will be contacted by email.
13) Submit your Team Expertise and BackgroundWrite your Team Expertise and Background section, include the APT submission number in the title, and email it to hubblereview@stsci.edu.

Next: HST Cycle 26 Filling Out the APT Proposal Form