+----------------------------------------------------------+ | HST Spectroscopy | STScI Analysis Newsletter | STIS/GHRS/FOS | September 2002 +----------------------------------------------------------+ Visit the "New in the Last 45 Days" section of the STIS website at http://www.stsci.edu/hst/stis for new information about STIS. This and previous issues of the STAN can be found at http://www.stsci.edu/hst/stis/documents/newsletters. +----------------------------------------------------------+ CALSTIS V2.13b Release Notes Calstis Version 2.13b was installed in the OTFR pipeline on 2002-Sep-05. The improvements in this version include: - Blaze shift correction - Implementation of improved STIS NUV DARK scaling algorithm - Implementation of time-dependent sensitivity algorithm for STIS NUV/FUV first-order spectroscopic modes CALSTIS 2.13b is now available for download in the new STSDAS release, Version 3.0, which can be found at the STSDAS Advisories page. Incorrect Dark Subtraction for Early 2001 CCD Data The STScI pipeline was recently updated with a patch to fix the temperature-dependent dark subtraction. CCD data that were requested from the pipeline in 2002 but originally observed in the first 5 months of 2001 have an incorrect dark subtraction, which will be fixed if the data are re-retrieved using the current version of On-The-Fly-Reprocessing. Correction of Errors in Aperture Description Table A revised version of the aperture description (_apd) reference file has been delivered to the archive. This corrects errors in the zeropoint offset of the wavelength scale for some apertures. These errors are particulary significant for slitless spectroscopy (about two CCD pixels). Monthly Offsets Disabled for Echelle Gratings On 2002 August 05 monthly offsets were disabled for STIS echelle observations. This operational change should allow more accurate flux and wavelength calibration of subsequent observations. Usage to date demonstrates that suppressing monthly offsets for echelle spectra will not affect the expected lifetime of the MAMA detectors. The 2002 HST Calibration Workshop The 2002 HST Calibration workshop will be held at the Space Telescope Science Institute on October 17 and 18 2002. Further details are available at the workshop's website. +----------------------------------------------------------+ | Need help? http://www.stsci.edu/hst/stis/help.html +----------------------------------------------------------+ | To subscribe or unsubscribe to the STAN, send a message | to majordomo@stsci.edu with a blank subject line and | the following in the body: [un]subscribe stis_news +----------------------------------------------------------+ | The Space Telescope Science Institute is operated by the | Association of Universities for Research in Astronomy, | Inc., under NASA contract NAS5-26555. +----------------------------------------------------------+
