STSDAS: Sp ace Telescope Science Data Analysis System
STSDAS is the software for reducing and analyzing data from the Hubble Space Telescope. The STSDAS software development group also produces and supports other software products such as the TABLES package for handling tabular-format data and IGI for the production of publication quality graphics in the IRAF environment. 


                      STSDAS v2.3 RELEASE SUMMARY

The primary changes incorporated in this release are:

1) Advanced Camera for Surveys (ACS) calibration pipeline package and
   paper products task.
2) Version 2.10 CALSTIS including enhanced scattered light correction
   capabilities.
3) Improvements to SYNPHOT to handle narrow emission lines.
4) clcmd & clcmdw added to the CVOS interface.
5) CVOS User's Guide.

The Science Software Group is engaged in an effort to move to doing
most of its software development with Python. The next release of
STSDAS/TABLES (v3.0) will have new tasks that will require our new
command language for IRAF called PyRAF (see pyraf.stsci.edu). In
particular, the next  version of the DRIZZLE package will require
PyRAF to use new functionality in DRIZZLE (all old tasks will continue
to be available from the existing IRAF CL). A beta version of PyRAF
is available, and we expect to release the first version late this summer.

New packages or tasks:

hst_calib.acs
hst_calib.stis.sc2dref

Packages or tasks that have seen significant changes include:

analysis.fitting.nlfit
hst_calib.fos.gimpcor
         .paperprod
         .stis.calstis
         .stis.inttag
         .stis.odelaytime
         .synphot.simulators
         .wfpc.uchcoord

Packages or tasks that have had minor enhancements or bug fixes include:

analysis.nebular.lib
hst_calib.ctools
         .fos.spec_polar
         .synphot.newlib
         .nicmos.pedsub
         .synphot.countrate
                 .calcphot
                 .newlib
                 .data
hst_calib.toolbox
hst_calib.toolbox.tools.epoch

Changes to  libraries:

lib/cvos
lib/synphot

Parameter files that have changed (new parameters or new default values,
excluding parameters indicating version number changes):

hst_calib.synphot/grafcheck.par     - 'grftable' default changed
                  graflist.par      - 'grftable' default changed
toolbox.tools/epoch.par			- 'year', 'month', 'day_of_month' added
hst_calib.stis/odelaytime/odelaytime.par - 'out_col' removed
                                         - 'verbose', 'Version' added
hst_calib.paperprod/pplist.par      - 'instr' changed to include support for
ACS

In addition the following packages have added parameter files

hst_calib.paperprod/jpp_calib.par   - for ACS support
                    jpp_obsum.par   - for ACS support
                    jpp_prods.par   - for ACS support
                    jpp_thumbs.par  - for ACS support
                    t_jpedigree.par - for ACS support
lib.cvos/test/n_openimage.par		- new test routines added