CALSTIS Version 2.15c was released on 2004-April-21 in the OTFR pipeline (OPUS 15.0b build). Note that this version includes a few of the changes announced in CALSTIS v2.16 (which was released on STSDAS only). Furthermore, OPUS 15.0b included changes that affect some of the STIS data. Those are listed at the end of this release. Users who want to have the most up to date calibration should first retrieve their data using OTFR and then recalibrate it locally using CALSTIS 2.16.
The following OPRs are implemented in the release of CALSTIS 2.15c:
| OPR 49936: | Scattered light algorithm output. |
| OPR 50011: | CALSTIS should correctly calculate the Q correction. |
OPR 49936: Scattered light algorithm output.
The CALSTIS6 IDT algorithm does not append a completion statement to
the output log. This situation can be confusing to those users that are
familiar with the normal CALSTIS output, since it might appear that
CALSTIS6 terminated abnormally.
OPR 50011: CALSTIS should correctly calculate the Q correction.
The Q factor is a correction to the error array when more than one
electron is created per photon. This effect occurs in the CCD at
wavelengths shorter than ~3400 Angstroms. The flux array already takes
this effect into account via the sensitivity array. However, the Q
factor algorithm gives incorrect values at low source flux levels or for
long exposure times.
The following OPRs are implemented in the release of OPUS 15.0b:
| OPR 48358: | OMAMA skips STIS exposures when qolink_sms not correctly populated . |
| OPR 49101: | Doppler shift for STIS time-tag data is not correct. |
| OPR 49166: | Conversion of HST clock is incorrect in SPT file. |
| OPR 49814: | Error in creation of STIS MAMA additive images. |
| OPR 50513: | Add CTECORR keyword for STIS CCD spectroscopic data (partially implemented). |
| OPR 50488: | STIS time-dependent sensitivity (TDS) tables for imaging data STIS. |
OPR 48358: OMAMA skips STIS exposures when qolink_sms not correctly populated.
The OMAMA process, when it does not find an entry in qolink_sms for
a mama exposure, skips the observation, sets the OM column to 'C' and
the BC column to 'W'. An error is reported only in the process log file.
Extracts from the log file will be attached as a comment.
OPR 49101: Doppler shift for STIS time-tag data is not correct
The AXIS1 column in STIS time-tag data is computed from the DETAXIS1
column by subtracting the Doppler shift. There is a phase error in this
computation. This degrades the spectral resolution in the raw file and
all subsequent files. The zero-point offset should be checked, and the table
of Doppler shifts should be checked to see whether a cosine is used
where a sine would be appropriate.
OPR 49166: Conversion of HST clock is incorrect in SPT file
This delivery fixes the HSTTIMES and other keyword values related to the
HST clock. The clock value is now a very large unsigned integer, so large
that the high bit is currently set. Conversion routines, especially on
Solaris, do not handle this correctly. The fix delivered here repairs
the representation of any large value in the headers.
OPR 49814: Error in creation of STIS MAMA additive images.
The STIS daily mama additive images and the lifetime cumulative images for
STIS data taken on or after 2003-Jun-15 appear to be in error. The first
extension of the daily cumulative images should contain the sum of all the images
taken with that detector during that day (including the wavelength calibration
images) Instead, starting on 2003-Jun-15 the images appear to have an extra
constant number added to each daily image. This constant varies from
image-to-image, and can be quite large.
OPR 50513: Add CTECORR keyword for STIS CCD spectroscopic data.
A correction for CCD charge transfer inefficiency is now included in the
flux-calibration step of calstis6 (x1d) for spectroscopic data. The x1d
task has a ctecorr parameter to give the user the option of turning this
on or off, but there is currently no way to control this step when running
calstis as a whole.
This OPR was partially implemented and therefore this keyword does
not appear yet in the header of the data.
OPR 50488: STIS time-dependent sensitivity (TDS) tables for imaging data STIS.
The fullmaster.xml rules file currently limits STIS time-dependent
sensitivity tables to OBSTYPE = SPECTROSCOPIC. The sensitivity also
varies for imaging data, so this restriction on OBSTYPE should be
removed.