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Space Telescope Imaging Spectrograph
March 2017 STAN

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| STScI Analysis Newsletter (STAN) 
| Space Telescope Imaging Spectrograph (STIS)
| March 2017
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In this STAN we provide updates on STIS to users preparing 
a program for the Cycle 25 HST Phase 1 deadline.

Contents:
  • STIS Focus Changes
  • Spatial Scanning with the STIS CCD
  • STIS CCD ETC Updates for Cycle 25
  • -------------------------------------------------------------- STIS Focus Changes There appears to have been a modest change in the focus of the STIS instrument in recent years. The primary impact of this on observers is a decrease in throughput when using STIS apertures that are less than 0.2" wide. In most common cases these losses are relatively modest, and we discuss how these changes impact the planning of observations. -------------------------------------------------------------- Spatial Scanning with the STIS CCD Spatial scanning with the STIS CCD can be used as an available-but-unsupported mode. -------------------------------------------------------------- STIS ETC Updates for Cycle 25 A new option for STIS CCD ETC calculations exist that allows the user to select the dark rate. +----------------------------------------------------------+ | Need help? http://www.stsci.edu/hst/stis/help.html +----------------------------------------------------------+ | To subscribe or unsubscribe to the STAN, send a message | to listserv@maillist.stsci.edu with a blank subject line and | only 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. +----------------------------------------------------------+