+----------------------------------------------------------+
| HST Spectroscopy
| STScI Analysis Newsletter
| STIS/GHRS/FOS
| April 2006
+----------------------------------------------------------+
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 v2.20 now available in STSDAS and in use with OTFR

A new version of the CALSTIS software (v2.20) was included 
as part of STSDAS v3.5 released on 2006-Mar-27. It was also
installed into the HST OTFR pipeline as part of the OPUS 
2006.3 build released on 2006-Apr-10.

CALSTIS 2.20 includes an improved algorithm for correcting 
1D spectral extractions for the effects of charge transfer 
inefficiency (CTI). For the best flux calibration of STIS 
CCD spectra, this version of the code should be used 
together with the latest versions of the CCDTAB and TDSTAB 
reference files, obtained from the archive on or after 
mid-day 2006-Apr-10. 

This new version of CALSTIS also revises the interpolation
of the error array used for 2D-rectified images (sx2 and
x2d files).


Recently published Instrument Science Reports (ISRs)

ISR 2006-01: Charge Transfer Efficiency of the STIS CCD: 
The time dependence of charge loss and centroid shifts from
Internal Sparse Field data

ISR 2006-02: Spectroscopic PSF: Comparison of Data and
Models for a Target Centered In and Out of the Aperture

+----------------------------------------------------------+
| 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.
+----------------------------------------------------------+