We provide Example Programs to walk users through all elements of a JWST observing program, from posing a question, to identifying an instrument-specific mode optimized to answer this question posed. These examples use Exposure Time Calculator (ETC) simulations to estimate reasonable exposure times, and illustrate how to specify the observations in the Astronomers Proposal Tool (APT).

As part of the single stream process, JWST proposals will require a detailed technical justification and Astronomers Proposal Tool (APT) executable.  Proposals may require significantly more preparation compared to HST.  While APT provides some templates for some of the most common observing modes (see Figure 1), some observing scenarios are more complicated.  The science use cases listed below provide a guide for crafting the technical aspects to your proposal, including how to use the Exposure Time Calculator (ETC)  and APT.

Here is a list of all NIRSpec related example programs:


NIRSpec MOS Observation of NGC 346

NIRSpec MOS Deep Extragalactic Survey

NIRSpec BOTS Observations of GJ 1214b

NIRSpec and MIRI IFU Observations of Cas A

NIRSpec IFU, MIRI Imaging, and MIRI MRS Observations of SN1987A

Related links


Last updated



The format for 'Last updated' is shown below. Enter updates above this internal"Comment" box. Only enter major updates (not typos or formatting changes).

Updated April 5, 2017

  • Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam fermentum vestibulum est. Cras rhoncus. 
  • Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Sed quis tortor. 

Published March 2, 2017