Release Notes for ETC 23.2

New Features

Welcome to ETC 23.2. This version of the ETC implements several new features, notably:

General

  • The wavelength ranges over which the various extinction laws apply are now displayed in the dropdown menu.
  • A warning is now generated if the specified target spectrum has zero or negative flux in the specified observation band (for imaging) or obswave (for spectroscopy).
  • Warnings about partial overlap between bandpass and spectrum now specify whether they arise from the target spectrum or the background spectrum.

ACS

  • No new features.

COS

  • For the COS Spectroscopic ETC when the FUV is specified, a new warning is generated if either FUV segment’s count rate exceeds the 5% discrepancy threshold for dead-time effects

STIS

  • No new features

WFC3

  • No new features

Documentation

  • The wording of various items on the web forms has been improved for clarity, as have various sections of the user’s guide.

Under the hood

  • Instrument data values have been updated for COS. (No updates were necessary for ACS, STIS, or WFC3.)
  • Various third party libraries have been updated.
  • The calculation of Vega magnitudes now uses an updated Vega spectrum. The P330E model has also been updated.

Resolved Issues

This version resolves the following issues:

General

  • A minor bug affecting the size of extraction regions for imaging modes has been corrected.
  • Attempting to specify a non-zero value for extinction or redshift when “no continuum” is selected, which is an invalid combination, now causes an input error that prevents form submission and annotates the incorrect input with red error text. (Previously, the ETC would permit submission but return an unhelpful error.)

ACS

  • Nothing to report.

COS

  • An appropriate minimum radius for a user-specified circular extraction region is now enforced in the COS imaging ETC

STIS

  • Nothing to report.

WFC3

  • Nothing to report.

Known Issues

Please see the News and Known Issues page for known issues with this release.

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