Release Notes for ETC 22.2

New Features

Welcome to ETC 22.2. This version of the ETC implements several new features, notably:

General

  • More options are now available for specifying reference magnitudes when renormalizing, including a selection of filters from ACS, NICMOS, and WFC3. The associated user’s guide section has been updated accordingly.
  • A number of new standard star models have been made available

ACS

  • Postflash counts are now included in the background total counts, and the background noise

COS

  • no new features

STIS

  • no new features

WFC3

  • The default extraction region for point sources for the UVIS and IR imaging ETCs has been changed back to a circular region with a radius of 0.2 arcsec, for consistency with the ACS default values.
  • Postflash counts are now included in the background total counts, and the background noise.

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 and STIS. (No updates were necessary for ACS or WFC3.)
  • The ETC calculation date remains set to MJD 57112.9, corresponding to the middle of cycle 22, 03-31-2014.
  • Various third party libraries have been updated.

Resolved Issues

This version resolves the following issues:

General

  • Validation of coordinate entry has been improved.
  • Spectroscopic plots are now labeled “per resel” for clarity.
  • Wording of several form items has been improved for clarity.

ACS

  • Nothing to report.

COS

  • The minimum buffer time warning now works correctly.
  • The spectroscopic acquisition ETC now correctly reports the stripe used only for NUV PeakXD mode.
  • Extraction heights for the COS have been updated to reflect the extraction heights used for the FUV gratings. This impacts all G130M central wavelengths except for G130M/1055, G130M/1096; all G160M central wavelengths; and both central wavelengths of G140L. In most cases users will see little difference, but the signal-to-noise of faint objects could be impacted negatively for G140L.

STIS

  • CCD parameters now have no effect, and are no longer displayed on the results page, for calculations using the MAMAs.
  • Throughput plot title now shows the correct observing mode.

WFC3

  • Nothing to report.

Known Issues

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

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