STSDAS Version 3.15 Release Notes June 2012 This release of STSDAS contains changes to the pipeline code for many HST instruments; primarily, ACS, STIS, WFC3 and COS. 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. HSTCAL and Future STSDAS Releases ================================= The code for CALACS has been removed entirely from STSDAS as it has been replaced by the HSTCAL version. Any user loading the acs package under STSDAS will be directed to the HSTCAL version which now has a Python-based TEAL interface as well as the standard command-line executable interface. The STSDAS versions of CALWF3 and CALSTIS will also be removed in future releases as they get replaced by HSTCAL versions of the code. Platform Support ================ Binaries for this release were built on Red Hat Enterprise Linux 4 and Mac OS X 10.5. Binaries were built with IRAF 2.14. Binaries for newer versions of IRAF or operating systems may be built as needed, and users can check the STSDAS web pages for more details. 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 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 oThe wf3rej task was upgraded to read and save the BUNIT keyword value from the [sci,1] extension of each input image and to then check those values each time input sci data arrays are loaded in the various subroutines. If the input data are in units of rates (either DN/sec or electrons/sec), the data are immediately scaled up by the exposure time of the particular image to turn them back into units of counts, which is the expected working units within wf3rej.verview is provided at: http://www.eso.org/~jwalsh/specres/ Support for these packages may be obtained by contacting the STScI Help Desk at 'firstname.lastname@example.org'. These questions will then be forwarded to the package authors at ESO as required. HST_CALIB ========== calstis ------- These are the major changes from calstis 2.36 to 2.40. The values in the FLUX and ERROR columns for echelle data will be set to zero if the spectral order does not have flux calibration information in the PHOTTAB. A new NET_ERROR column has been added to the x1d table to give the error estimate for the net count rate. The buffer size for an individual file name has been increased to 1024 characters. The length of a string of input or output file names for calstis, basic2d, or ocrreject is limited by the operating system. Calstis now recognizes the command-line option -r, which will print the full version string and exit with a status of 0. There is also a --version option that prints just the version number. calwf3 ------ These are the major changes for calwf3 from v 2.4.1 to v2.7 The calwf3 IR ramp fitting routine (cridcalc step) adds up the total integration time of all unrejected samples for each pixel and stores that value in the output FLT file TIME extension. In some unusual circumstances involving the rejection of either the 1st or 2nd sample as bad or containing a CR hit, the total integration time was not coming out correctly, due to either a single valid sample in the 1st read or the valid part of the ramp starting in the 2nd read. The error was such that the reported total time is an overestimate, because the time associated with the rejected samples is not being removed properly. The fitsamps routine in cridcalc was modified to correctly initialize the total integration time counter with the sample time of the first unrejected sample. When calwf3 was executed for an association that contained repeat-obs (RPT) members it ignored the setting of the RPTCORR calibration switch in the image headers and always applies RPTCORR processing, which consists of calling the wf3rej task to combine the images. This made it impossible to control the application of RPTCORR processing via the OPUS keyword rules that set the RPTCORR switch. The high-level logic of calwf3 association processing was modified so that it only applies the wf3rej step when RPTCORR=PERFORM in the image headers. In association with this, the calwf3 routines that build the association-level trailer file have been modified so that when a sub-product has not been created (i.e. wf3rej is not run) they use the trailer files of the individual association members, instead of trying to use the trailer file(s) of the crj sub-product. The wf3rej task was upgraded to read and save the BUNIT keyword value from the [sci,1] extension of each input image and to then check those values each time input sci data arrays are loaded in the various subroutines. If the input data are in units of rates (either DN/sec or electrons/sec), the data are immediately scaled up by the exposure time of the particular image to turn them back into units of counts, which is the expected working units within wf3rej. Negative cosmic rays are now accounted for in IR WFC3 images during cosmic ray rejection. The zero-read pixel value is now used for ramp-fitting when the pixel is already saturated in the zeroth read of the ramp. The behavior has been modified such that pixel which are saturated in the zeroth read or in the first read are handled the same way. In both cases the output value is set to the value in the zeroth read. In the case where the zeroth read value is already saturated, a dq=256 flag will be added to the DQ array of the flt file. In the case where saturation does not occur until the first read, no saturation flag will be added to the flt DQ array. This eliminates blank pixels in the output FLT image. The IR cridcalc handling of pixels detected to contain spikes was modified so that pixels flagged as bad from the static DQ mask still go through the process of CR detection, in order to produce cleaner output FLT images. new option added "-r" to calwf3 to print the current verison and exit aXe - stsdas.analysis.slitless ------------------------------ The test of the width parameter in the OAF file was updated to specify that it's the half-width and not the width. Similarly, the AWIDTH1A BWIFTH1A and AORIENT1A are copied of the Sextractor parameters A_IMAGE, B_IMAGE and THETA_IMAGE. They therefore refer to the semi major axis, semi minor axis and orientation to the semi major axis wrt to the horizontal. synphot ------- Updated the synphot calcband and calcspec help files to contain more useful information on how to use the thru() function to read ASCII passband files.