Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113510h&link_type=abstract
American Astronomical Society, AAS Meeting #211, #135.10; Bulletin of the American Astronomical Society, Vol. 39, p.973
Other
Scientific paper
In August 2004 the Space Telescope Imaging Spectrograph (STIS) suspended operations because of a failure in a low-voltaage power supply. After this failure, a uniform recalibration was initiated of all STIS data acquired between the 1997 installation of STIS into HST and the suspension in 2004. We will discuss the improvements to the calibration of STIS made as part of this effort. These include substantial improvements to the flux calibraton for many modes, an improved algorithm to calculate corrections for charge transfer inefficiency losses (CTI) for 1st order CCD spectra, improvements to spectral traces for 1st order modes, and associating science observations taken without automatic wavelength observations with the GO-specified wavelength calibration observation. All existing STIS data have now been recalibrated with these and other improvements. Since the calibration reference files and software are now stable, copies of the raw and calibrated files for all STIS observations were saved and used to produce a static archive, which is currently being used by the HST MAST archive to satisfy user data requests in place of the usual On-The-Fly-Recalibration (OTFR) procedure. Replacing OTFR with the static archive allows much faster data deliveries while using fewer computing resources.
We also discuss a number of new post-pipeline analysis tasks which have been made available as part of the STIS package in the STSDAS distribution. These are: ctestis, a task that can be used to estimate CTI effects for STIS CCD imaging observations, mktrace, a task for determining the best trace
alignment for 1st order spectral data, and wx2d, a task which uses wavelet interpolation techniques to resample STIS 2D spectral data as an alternative to the default bi-linear interpolation used to rectify such data.
Aloisi Alessandra
Dencheva N.
Diaz-Miller Rosa
Dressel Linda Lou
Goudfrooij Paul
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