STScI Logo

STSDAS
STSDAS 3.11 Release Notes

    
    
    November 2009
    
    
    ** This release does not contain binaries for PowerPC Macintosh. However,
    there are no known reasons why a user could not build this package from 
    source code on a PowerPC using the installation instructions for STSDAS.  
    
    This release of STSDAS contains changes to the pipeline code for most of
    the instruments (ACS, WFPC2, NICMOS, and WFC3).
    
    The specific changes are detailed in the following sections.
    
    
    Platform Support 
    ================ 
    Binaries for this release were built on Red Hat Enterprise Linux 4,
     Solaris 5.8, and Mac OS X 10.5 (Intel architecture only).
    
    Binaries were built with IRAF 2.14, except for Solaris, which were
     built with IRAF 2.12.2a.  IRAF is available from http://iraf.net.
    
    HST_CALIB.WFC3
    --------------
      - support was added to run MultiDrizzle in the pipeline on WFC3 data
    
      - CALWF3 v1.8.1 includes several updates and bug fixes, including:
      
	1) The IR CRCORR calibration step, which performs up-the-ramp
	fitting and cosmic-ray rejection on MultiAccum readouts to
	form the single calibrated image in the FLT output file,
	has been modified to behave differently for pixels that
	have all of their samples flagged with some kind of problem
	condition. Previously, pixels that had all samples flagged
	(e.g. as a bad pixel, dq=4; a hot pixel, dq=16; an unstable
	pixel, dq=32) still had a ramp fit calculated from their
	samples, the result of which was stored in the SCI array of
	the output FLT file, along with the associated DQ values
	recorded in the output DQ array of the FLT file. The new
	version places a value of zero in the SCI array of the FLT
	file for these pixels, while still carrying over the list
	of DQ values into the DQ array of the FLT file.
    
	2) The IR CRCORR step was also upgraded to allow the user to
	specify a data quality (DQ) mask value to use in rejecting
	pixel samples, whereas previously the mask value was set
	inside the software. The mask value is now read from the
	"badinpdq" column of the IR cosmic-ray rejection parameters
	reference table (CRREJTAB). Note that this change requires
	the use of a new version of the CRREJTAB that has non-zero
	values entered in the "badinpdq" column of the table. The
	default value now being used in OPUS processing is 316
	(256+32+16+8+4).
    
	3) The UVIS and IR FLATCORR calibration steps, which divide
	science images by a flatfield reference image and apply the
	detector gain calibration to convert the data from units
	of DN to electrons, have been fixed to correct a problem
	associated with quadrant-dependent gain values. Gain
	variations between detector quadrants are naturally
	accounted for in the flatfield images and therefore applying
	quadrant-dependent gain values for the gain calibration
	step produced an overcorrection. The gain calibration part
	of the FLATCORR step has been modified to compute and apply
	the mean gain of all four quadrants to the entire image. The
	gain values come from the CCDTAB reference table.
    
	4) The IR FLATCORR routine was fixed to reset the BUNIT
	keyword in the headers of output IMA and FLT files from units
	of COUNTS to ELECTRONS after the gain calibration is applied.
    
	5) A bug was fixed in the WF3REJ routine that was causing
	crashes when combining REPEAT-OBS combinations of IR
	subarray images. The bug only affected IR subarray images,
	not full frame.
    
	6) Several routines within CALWF3 were modified to set
	correct values for the NEXTEND keyword in the headers of IR
	association product files, including DRZ, CRJ, and SPT files.
      
    
    HST_CALIB.WFPC2
    ---------------
      - CALWP2 V2.5.5 is the final version used for reprocessing all WFPC2
	data in the archive to generate the final, static archive of
	calibrated WFPC2 data. 
    
      - This version fixed a bug to allow CALWP2 to run successfully
	on MEF input images when DOHISTOS=PERFORM and initialized
	ZP_CORR keyword value to 0.0 when DOPHOTOM=OMIT
      
    HST_CALIB.ACS
    --------------
      - CALACS V5.0.5 fixed problems with ACSREJ choking when the
	  input image had empty DQ arrays (no bad pixels were flagged in
	  input images).
    
    
    HST_CALIB.NICMOS
    ----------------
      - CALNICA v4.4.1 updated to address the following issues:
    
	+ temperature from bias limits are checked when applying the
	    TDD dark reference file during the shading correction step
	    while the AMPGLOW and LIN extension values are also used.
    
	+ the value of ALLOWDIF was revised so that the correct darks
	    get chosen for extremely short bright object mode images.
    
	+ the code now provides specific instructions to the user about
	    updating the dark reference file to use a temp-from-bias file
	    when TFBLOW or TFBHIGH keywords are not found, then it simply
	    exits so that an incorrect dark does not get applied.
    
    ANALYSIS.DITHER
    ---------------
      - IRAF EPAR interface to PyDrizzle updated to support multiple
	  chip specifications using comma-separated integers as input
	  to the 'section' parameter.  
      
      - Drizzle FORTRAN code updated to correctly apply photometric
	  scaling when using SIP coefficients for distortion model in
	  drizzle tasks
    
    ANALYSIS.NEBULAR
    ----------------
      - some data files missing from the previous release were added
	  back in for this release; specifically, ar_ii_atom, ar_ii_coll,
	  ne_ii_atom, and ne_ii_coll.
      
    ANALYSIS.SLITLESS
    -----------------
      - new version of aXe, Version 2.0, as well as the aXesim package,
	  Version 1.3, are included in this release.  More details on
	  these packages can be obtained directly from ST-ECF at:
    
      http://www.stecf.org/software/slitless_software/axe/
      http://www.stecf.org/software/slitless_software/axesim/