HRC-S Degap Correction

Overview

Last Update: 21 Feb 2007 - replace POG link with pointer to calibration page

Synopsis:

Purpose:

To generate a new level=2 event file with the HRC-S degap corrections applied.

Read this thread if:

you are working with an HRC-S dataset affected by the Calibration Updates.

Calibration Updates:

Get Started shows how to check the CALDBVER of your data.

• CALDB v3.2.0 (21 Nov 2005): A first iteration of corrections for the known non-linearity in the HRC-S/LETG spatial wavelength scale is now available. It will improve the performance of the LETGS, but does not account fully for all the systematic errors in the dispersion relation. The RMS deviation of the wavelength differences drop from 0.014 A (0.010 A over just the central plate) prior to the correction, to 0.010 A (0.006 A over the central plate).

  The new file is $CALDB/data/chandra/hrc/bcf/gaplookup/hrcsD1999-07-22gaplookupN0002.fits.

• CALDB v3.1.0 (23 Jun 2005): The degap algorithm was changed in CIAO 3.2.2 to use a different calibration file format. The new HRC-S file is $CALDB/data/chandra/hrc/bcf/gaplookup/hrcsD1999-07-22gaplookupN0001.fits. This change is transparent to users; it is not necessary to reprocess data that have had the degap correction applied.
• CALDB v2.6 (7 Jun 2001): The new degap correction degap calibration file (hrcsD1999-07-22gapN0002.fits) constitutes a significant improvement over the old one.
• CALDB v2.4 (19 Mar 2001): A new event hyperbolic test (FPTEST) coefficients file was released.

Related Links:

• "HRC-S Degap Corrections" calibration page: technical details on the degap correction.
• Analysis Guide: HRC Data Preparation

Parameters for /home/username/cxcds_param/hrc_process_events.par


#
#  Parameters for the hrc_process_events task
#
        infile = hrc_evt1.fits    input level 0 event file/stack
       outfile = hrc_new_evt1.fits output level 1 file
    badpixfile = hrcf01557_000N001_bpix1.fits bad pixel file ( NONE | none | <filename>)
    acaofffile = pcadf100494341N001_asol1.fits aspect offset file ( NONE | none | <filename>)
      (geompar = geom)            Parameter file for Pixlib Geometry files
(alignmentfile = )acaofffile -> pcadf100494341N001_asol1.fits) sim/fam alignment file ( NONE | none | <filename>)
      (obsfile = NONE)            obs.par file for output file keywords ( NONE | none | <filename>)
     (gainfile = CALDB)           gain correction image file ( NONE | none | <filename>)
      (ADCfile = NONE)            ADC correction table file ( NONE | none | <filename>)
    (degapfile = CALDB)           degap factors (NONE | none | COEFF | <filename>)
      (hypfile = CALDB)           Hyperbolic test coefficients file ( NONE | none | <filename>)
 (ampsfcorfile = CALDB)           caldb file for amp_sf_correction( NONE | none | <filename>)
      (tapfile = CALDB)           tap ring test coefficients file ( NONE | none | <filename>)
   (ampsatfile = CALDB)           ADC saturation test file ( NONE | none | <filename>)
  (evtflatfile = CALDB)           Event flatness test file ( NONE | none | <filename>)
      (badfile = NONE)            output level 1 bad event file
      (logfile = stdout)          debug log file (STDOUT | stdout | <filename>)
     (eventdef = )stdlev1 -> {d:time,s:crsv,s:crsu,s:amp_sf,s:av1,s:av2,s:av3,s:au1,s:au2,s:au3,l:raw,
s:chip,l:tdet,f:det,f:sky,s:pha,s:pi,s:sumamps,s:chip_id,x:status}) output format definition
  (badeventdef = )badlev1 -> {d:time,s:crsu,s:crsv,s:au1,s:au2,s:au3,s:av1,s:av2,s:av3,s:pha}) output format definition
   (grid_ratio = 0.5)             charge ratio
    (pha_ratio = 0.5)             pha ratio
  (wire_charge = 0)               turn on center wire test (-1=off,0=on)
         (cfu1 = 1.0)             u axis 1st order cor. factor
         (cfu2 = 0)               u axis 2nd order cor. factor
         (cfv1 = 1.0)             v axis 1st order cor. factor
         (cfv2 = 0)               v axis 2nd order cor. factor
  (time_offset = 0)               Offset to add to event time field to synch w/ fam data
     (amp_gain = 75.0)            amp gain
     (instrume = hrc-s)           hrc instrument- used for parameter file
(do_amp_sf_cor = no)              perform amp_sf correction (y/n) ?
     (do_ratio = yes)             perform ratio validity checks
       (tstart = TSTART)          header key containing default time value (HSI)
        (tstop = TSTOP)           header key containing time of last event
      (clobber = no)              Overwrite output event file if it already exists?
      (verbose = 0)               level of debug detail (0=none, 5=most)
    (rand_seed = 1)               random seed (for pixlib), 0 = use time dependent seed
(rand_pix_size = 0.0)             pixel randomization width (-size..+size), 0.0 = no randomization
        (start = coarse)          start transformations at [coarse,chip,tdet]
         (stop = sky)             end transformations at [none,chip,tdet,det,sky]
      (badlev1 = {d:time,s:crsu,s:crsv,s:au1,s:au2,s:au3,s:av1,s:av2,s:av3,s:pha}) event format definition string
      (hsilev1 = {d:time,s:crsu,s:crsv,s:au1,s:au2,s:au3,s:av1,s:av2,s:av3,s:chipx,s:chipy,s:tdetx,s:tdety,s:x,
s:y,l:fpz,s:pha,s:vstat,s:estat}) event format definition string
      (stdlev1 = {d:time,s:crsv,s:crsu,s:amp_sf,s:av1,s:av2,s:av3,s:au1,s:au2,s:au3,l:raw,s:chip,l:tdet,f:det,
f:sky,s:pha,s:pi,s:sumamps,s:chip_id,x:status}) event format definition string
      (simlev1 = {l:tick,i:scifr,i:mjf,s:mnf,s:evtctr,s:crsu,s:crsv,s:au1,s:au2,s:au3,s:av1,s:av2,s:av3,s:tdetx,
s:tdety,s:pha,s:vstat,s:estat}) sim event definition string
      (fltlev1 = {d:time,s:crsv,s:crsu,s:amp_sf,s:av1,s:av2,s:av3,s:au1,s:au2,s:au3,s:chipx,s:chipy,l:tdetx,
l:tdety,s:detx,s:dety,s:x,s:y,s:pha,s:sumamps,s:chip_id,l:status}) event format definition string
         (mode = ql)