Bugs: dmextract - CIAO 3.4

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Matching CIAO and CALDB Versions

CIAO 3.4 requires CALDB 3.3.0 or higher to operate properly.

CALDB 3.4.0 and higher should not be used unless you are running CIAO 3.4 or CIAO 4.0.

Are your versions mismatched? Time to update CIAO and CALDB!

News Previous Items

11 Nov 2008

These are the webpages relative to the CIAO 3.4 release (18 December 2006). They are no longer actively updated, however the CXC will continue limited support of CIAO 3.4 for the near future.

CIAO 3.4 users should check the CALDB 3 website for compatible calibration updates.

15 Dec 2008

The newest version of the Chandra Interactive Analysis of Observations software, is CIAO 4.1, released on 15 December 2008. Read the release notes for detailed information. This release requires that CALDB 4.1.0 be installed for the software to work correctly.

Bugs

dmextract does not ignore pixels in an image with a value equal to the BLANK keyword.

A parse error occurs when combining the grid syntax with use of the bkg parameter (01 Dec 2006)

For example:

unix% dmextract \
      infile="acis_evts.fits[pos=circle(25920,25920,300)][bin time=grid(src_bin100.lc[cols time_min,time_max])]" \
      outfile=lightcurve.fits opt=ltc1 \
      bkg="acis_evts.fits[pos=circle(21184,30496,1200)]" 
# dmextract (CIAO 3.4): dsDMEXTRACTREGPARSEERR -- ERROR: Failed to parse the supplied regions. Please check the format.

# dmextract (CIAO 3.4): dsDMEXTRACTPROFILEERR -- ERROR: Failed to process some files.

Even though the grid syntax is used in the input file filter, it is the parsing of the background file definition that causes a failure. Leave the bkg parameter blank and the command runs correctly.

Bugs fixed in CIAO 3.4

The following is a list of bugs that were fixed in the CIAO 3.4 software release.

When creating a radial profile, dmextract includes a COUNT_RATE_ERR column in the output which is full of zeroes.

Incorrect background exposure time with "opt=ltc1" (16 Aug 2006)

When dmextract is run with "opt=ltc1", the background exposure time in each bin is calculated incorrectly. The total LIVETIME is reported in the BG_EXPOSURE column. Since the BG_EXPOSURE is incorrect so is the BG_RATE, NET_COUNTS, NET_ERR, and the ERR_RATE. If a background exposure file (e.g. a DTF file) is supplied, it is also not applied.

Combining a weight with the grid syntax does not work correctly in dmextract

This is NOT fixed for the "bkg" parameter yet.

For example:

unix% dmextract \
      "acis_evts.fits[bin time=grid(acis_lc3.fits[cols time_min,time_max]);energy]" \
      lcurve.fits op=ltc1

The ";energy" combined with the "grid()" is not parsed properly; "grid()" by itself works fine.