The JWST Exposure Time Calculator (ETC) version 5.0 is now live. This release includes several useful new capabilities and features, including:

• Added support for MIRI Wide Field Slitless Spectroscopy mode
• Added support for four new NIRISS SOSS multi-stripe subarrays for observations of very bright targets with SOSS mode
• Several user interface improvements including a workbook loading indicator, better error messaging, and an easier way to share workbooks 
• Updated instruments aperture file parameters, PSFs, and default calculation values have been included for most instrument modes
• Several backend improvements have been made to better support hundreds of simultaneous users 

See the release notes for details, and be sure to review the known issues for this release. Instructions for downloading the new version of the Pandeia engine and the associated data are found in the JWST Documentation and the Pandeia Engine News page.

If you have any questions about this release, please let us know via the JWST Help Desk.