Release Notes for ETC 24.2

New Features

Welcome to ETC 24.2. This version of the ETC implements several new features, notably:

General

  • Improved language and calculation for zodiacal light when specified as a function of position and date or helio-ecliptic longitude. Details are available in the User’s Guide, Specifying the Appropriate Background.
  • A warning is now generated if a user specifies renormalization in a GALEX band in the vegamag system.

ACS

  • Nothing to report.

COS

  • Nothing to report.

STIS

  • An additional option has been added in Question 1 for the FUV MAMA detector. It allows users to specify the level of additional detector background rate due to the glow region level that should be assumed in the calculation. See STIS ISR 2015-07 for a description of the glow region.

WFC3

  • Nothing to report.

Documentation

  • The wording of various sections of the user’s guide has been improved for clarity, and additional information has been provided on the calculation of the zodiacal background.

Under the hood

  • Instrument data values and/or detector sensitivity values have been updated for COS, STIS, and WFC3 UVIS. (No updates were necessary for ACS or WFC3 IR.) In particular, the WFC3 UVIS changes may result in up to 20% less required exposure time for some filters (notably the FQ filters). For details, see WFC3 ISR 2016-01.

Resolved Issues

This version resolves the following issues:

General

  • If any specified emission lines are outside the valid wavelength range for the calculation, they are now omitted from the source specification, and this is reported. (Previously, lines that were outside the valid wavelength range would halt the processing of lines, which produced behavior in which the order in which the lines were entered changed the results.)
  • The reset button now correctly resets the disperser for most spectroscopic modes

ACS

  • Nothing to report.

COS

  • Nothing to report.

STIS

  • Nothing to report.

WFC3

  • Filter descriptions have been updated

Known Issues

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

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