STScI Logo

STSDAS
STSDAS Version 3.14 Release Notes

    August 2011
    
    This release of STSDAS contains changes to the pipeline code for nearly
    all the instruments (STIS, NICMOS, WFC3 and COS).  In addition,
    the final software used by the ST-ECF to calibrate FOS data has been
    included strictly as a record of the processing performed to generate
    the FOS products available from the HST archive. 
    
    The specific changes are detailed in the following sections.
    
    
    Platform Support
    ================
    Binaries for this release were built on Red Hat Enterprise Linux 4 and
    5 and Mac OS X 10.4 (PPC and Intel architecture).  Binaries were built
    with IRAF 2.14.
      
    IRAF is available separately from http://iraf.net.
    
    No Solaris Support
    ------------------
    This release has NOT been tested on the Solaris platform.  We no longer
    build Solaris binaries for STSDAS, although the source code can always
    be downloaded and compiled locally as needed.
    
    
    64-bit IRAF Support
    --------------------
    IRAF 2.15 includes support for 64-bit systems. The changes necessary to
    support 64-bits generally require applications to be modified. We will
    only release 32-bit binaries of the Tables and STSDAS packages for use
    with IRAF 2.15. Support for 32-bit binaries will continue as long as
    there are sufficient platforms that such binaries will run on. We may
    only convert some packages in Tables and STSDAS to 64-bit version when
    the 32-bit versions are no longer viable and if created will be released
    as a separate package with a different name. When the 32-bit versions
    of TABLES and STSDAS are no longer viable, support for any tasks within
    those packages not ported to 64-bits will end.  The full description of
    this policy can be found online at:
    
    http://www.stsci.edu/resources/software_hardware/stsdas/iraf64
    
    
    STECF Software
    ==============
    This release also contains the latest version of the stecf IRAF package for
    supporting HST data that had been developed by members of the Space
    Telescope European Coordinating Facility (ST-ECF) which closed on 31
    December 2010.
    
    The packages included in stecf are:
    
    imres - Tasks used for photometric image restoration with unconstrained star
	    positions, simulating images with ground-based seeing and making
	    apodizing mask images.
    
    impol - A package for imaging linear polarization mapping for data taken
	    using the polarimetry modes of HST instruments.  An overview and 
	    access to demos and help files is available at:
		    http://www.eso.org/~jwalsh/softpol/
    
    specres - A package for point source extraction and background decomposition
	      of 2-D (longslit) spectra. An overview is provided at:
		    http://www.eso.org/~jwalsh/specres/
    
    Support for these packages may be obtained by contacting the STScI Help
    Desk at 'help@stsci.edu'. These questions will then be forwarded to the
    package authors at ESO as required.
    
    
    HST_CALIB
    =========
    
    WFC3
    ====
    The WFC3 calwf3 task has been updated to version 2.4, which includes
    the following change:
    
      - The logic used to execute the wf3ccd, wf3rej, and wf32d series
	of sub-tasks for associations of UVIS exposures has been updated
	to properly handle cases where wf3rej is skipped due to the number
	of input images exceeding its current limit of 120. In this case,
	wf32d processing will be skipped for the (non-existent) wf3rej
	product, while wf32d processing will be applied to all of the
	individual input exposures if EXPSCORR=PERFORM.
    
    Note that calwf3 v2.3 was released in STSDAS v3.13 patch release 1 in
    April 2011, which contained an important correction for processing
    of IR subarray exposures.  For more details, see the calwf3 release
    notes page at
    
	http://www.stsci.edu/hst/wfc3/pipeline/CALWF3ReleaseNotes.html
    
    
    
    STIS
    ====
    CALSTIS Version 2.36 (27-May-2011) has been updated for this release.
    The changes include:
    
       - Improve the a4corr correction for echelle wavecal processing
	 in calstis.
    
       - fixed the bug that caused CALSTIS to crash when an imset was
	 missing due to having an exposure time of 0.
    
       - a new command-line option -bn was added that turns off ('n'
	 for none) background smoothing, an option that gets turned on when
	 'bksmode="off"'.
    
       
       
    mkfringeflat
    ------------
	- A problem running mkfringeflat under pyraf on image sections was fixed.
    
    ctestis
    -------
	- This task was modified to add a new column to the output table
	  that lists the correction to the measured Y centroid of a
	  star due to distortions of the PSF caused by CTE trails on the
	  STIS CCD.
	
    
    HSTCOS
    =======
    CALCOS has been updated to CALCOS Version 2.15.4.  Changes were only
    made to the Python code itself found in the STScI_Python release,
    while no changes were implemented in the IRAF interface to that code
    found in this package. This version includes:
    
	- A 'walk' correction was added to CALCOS to correct the pixel
	  coordinates of events in an FUV TIME-TAG exposure for shifts
	  which are dependent on the pulse height amplitude (PHA).
    
	- Use exposure appropriate for each FUV data segment in the x1d 
	  correction.
    
	- A bug in background smoothing during spectral extraction has
	  been fixed.  This mostly affects values near the endpoints of
	  the spectrum.
	    
    
    NICMOS
    ======
    No changes were implemented in this package.
	
    ACS
    ======
    CALACS Version 5.2.1 (11-Feb-2011) contains several updates to better
    support post-SM4 data and to calibrate CR-SPLIT and NREPEAT > 1 CCD
    data the same. These changes include:
    
	- All CCD data taken as either CR-SPLIT or REPEAT-OBS associations
	will be calibrated and combined as CR-SPLIT data. This will eliminate
	the generation of _sfl.fits files for ALL ACS CCD data in the pipeline
	and only produce _crj.fits files (along with the currently generated
	_flt.fits files for each input exposure). This change will NOT affect
	how ACS/SBC (MAMA) data gets processed, only ACS CCD observations.
    
	- The logic implemented in CALACS to correctly propogate the
	cosmic-ray DQ flags to the final FLT images was fixed.
    
	- The initialization of the ERR array values for ACS (post-SM4) did
	not match the expected ERR values given the inputs provided by the
	reference files. CALACS was refactored to perform BLEVCORR prior to
	doNoise, then changed to not use the bias value in initializing the
	ERR array values.
	    
	
    aXe
    ======
    Updates for aXe v2.3 include:
    
	- Fixed a bug in "drzprep" that was causing 2-d stamp images to
	  have the wrong size (too short in the x/dispersion direction)
	  when setting DRZRESOLA in the .config file to a value smaller
	  than the physical pixel size, in order to oversample the
	  drizzled image.
    
	- Fixed a bug in "drzprep" that was causing the estimated errors
	  for spectra extracted from sub-sampled 2-d images with axedrizzle
	  to be too high by about a factor of 6.
    
	- Modified the behavior of "axeprep" so that it no longer quits
	  with an error when encountering an object in the input object
	  list (IOL) with mag=99, which occurs when SExtractor can't
	  compute a magnitude for an object. It will now just issue a
	  warning and continue with processing. Entries for these objects
	  will be ignored in later processing steps based on the setting
	  of MMAG_EXTRACT.
    
	- Calls to most IRAF tasks within the axeprep, fcubeobjs, and
	  drizzleobjects tasks have been replaced with equivalent Python,
	  PyFITS, and numpy procedures.
    
	- Fixed a bug that caused "axedrizzle" to crash when users had
	  a very long directory path for the input and output files.
    
	- Updated aXe use of "Raise" when reporting error conditions to
	  make them consistent with Python 2.7 usage of Exceptions.
    
	- Fixed potential divide-by-zero errors in several tasks.
       
    
    IMGTOOLS
    ========
    Updates were made to 'improject' to use the correct function for
    getting an image section when the image data is double precision.