Release Notes for ETC 23.1

New Features

Welcome to ETC 23.1. This version of the ETC implements several new features, notably:

General

  • Presentation and text for the description of extraction regions has been improved and made consistent across ETCs.

ACS

  • No new features.

COS

  • Stripe-specific SNR and exposure time results are now reported for the COS Spectroscopic Acquisition ETC for NUV PeakXD mode.

STIS

  • The 31X0.05NDA, 31X0.05NDB, and 31x0.05NDC slits are now available in the STIS spectroscopic ETC in the MAMA UV echelle slit pulldown menu, as well as the STIS TA ETC under the ACQ/PEAK options.

WFC3

  • Atmospheric helium is now offered as a new background component or WFC3IR calculations. The strength of the Helium I line can be set to None (by default), Average, High, or Very High. See the user’s guide and WFC3 ISR 2014-03 for more detail and guidance on which setting to select.

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 is now set to MJD 57462.3, corresponding to the middle of cycle 23, 03-15-2016.
  • Various third party libraries have been updated.

Resolved Issues

This version resolves the following issues:

General

  • Clicking the “Browse” button to upload a spectrum file now automatically selects the associated radio button so that the uploaded file will be used as the target spectrum

ACS

  • The ACS spectroscopic ETC now performs wavelength range checking on the specified obswave and will notify the user if the wavelength is out of range.

COS

  • Tabular results for dark current are now correctly reported per pixel, rather than per resel.
  • Spectroscopic calculations for extended targets less than 2.5” in diameter now correctly use the target diameter, rather than the aperture diameter, when computing the extracted target rate, the SNR, and the time.
  • Assorted mostly small problems associated with bugs in the handling of the geometry of the detector, aperture, and extraction region have been fixed.

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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