Welcome to version 1.7 of the JWST ETC!
This release features new normalization filters, updated template spectra, bug fixes, and improved APT consistency: see the Release Notes for details, and be sure to review the Known Issues for this release.
When you log in, workbooks from ETC 220.127.116.11 and earlier will be marked with a previous version number in the "Version" column:
Be sure to review the Known Issues with this release.
Calculation run times for certain instrument modes (SOSS; NIRSpec IFU; coronagraphy) are longer because the underlying computations are more complex.
The use of highly sampled spectra, or sources with extremely narrow lines, may result in significantly longer run times for spectroscopic modes.
Occasionally, the UI may appear to be unresponsive or stalled. Try reloading the page; this often clears the issue.
System performance depends on usage/load; if the system appears unresponsive, wait 1-2 minutes. Please avoid repeatedly clicking, because this will make the problem worse. If the system remains unresponsive, contact the JWST Help Desk.Accuracy of ETC Calculations
The ETC approximates our current best knowledge and understanding of the performance of the JWST instruments, based on ground measurements and calibrations. It has been validated against independent instrument models provided by the instrument teams. It is important to note that there are remaining uncertainties associated with system throughputs, detector noise properties, etc., which will not decrease until the observatory has completed commissioning. Users should exercise appropriate caution when interpreting results from the ETC. A number of known issues remain, which may affect predicted sensitivities. See Known Issues for additional details.
The ETC is not intended to be a complete observation simulator, and some higher-order effects are not taken into account, such as field distortion.