HETG/ACIS-S/TE

acis_process_events 
  rand_pix_size='0'
  badpixfile='bpix1'

  We turn off pixel randomization.  Exposures with gratings are
  typically long enough to remove any aspect sub-pixel systematics
  which might be present in short observations.  We supply the
  observation-specific bad pixel file.

dmcopy
  infile='evt1_0[events][grade=0,2,3,4,6,status=0,energy<12000]'

  We filter on good grade, good status, and remove high energy
  (usually background) events.

dmcopy
  infile='evt1_1[events][@flt1]'

  In a separate step, we filter on the good-time-intervals in the
  "flt1" file. 

destreak
  filter='yes'

  This removes artifacts from CCD S4.

tgdetect
  fixedcell='6'

  We use the cell size recommended for multiple close sources.

tg_create_mask

tg_resolve_events

tgextract
  extract_background='yes'

  We extract background spectra, even though background is usually
  negligible for HETGS.  This can be important, however, for assessing
  contamination by nearby sources.

aglc

  This is an ISIS program for extracting light curves from HETG/ACIS
  data (or LETG/ACIS).  It handles exposures per chip, and can also
  bin by phase.

asphist

  An aspect histogram is made for each CCD.

pset ardlib
  AXAF_ACIS4_BADPIX_FILE='bpix1[BADPIX4]'
  AXAF_ACIS5_BADPIX_FILE='bpix1[BADPIX5]'
  AXAF_ACIS6_BADPIX_FILE='bpix1[BADPIX6]'
  AXAF_ACIS7_BADPIX_FILE='bpix1[BADPIX7]'
  AXAF_ACIS8_BADPIX_FILE='bpix1[BADPIX8]'
  AXAF_ACIS9_BADPIX_FILE='bpix1[BADPIX9]' 

  The ardlib parameter file needs to have the observation-specific bad
  pixels set.


mkgrmf

  We make grating rmfs for -1 and +1 orders, for both grating types
  (MEG and HEG).

mkgarf
  pbkfile='pbk0'
  maskfile='msk1'

  We make arfs for -1 and +1 orders, for both grating types, and give
  the observation-specific parameters necessary for computing the
  "dead-area" factor.


dmarfadd

Summary plots are made by ISIS scripts. 

HETG/ACIS-S/TE with "findzo"

tg_create_mask
  use_user_pars='yes'
  sA_zero_y='4139.14'
  sA_zero_x='4040.77'

  Here we use the findzo position in tg_create_mask. (The specific
  values are replaced with whatever findzo computed.) 

HETG/ACIS-S/CC

acis_process_events
  apply_cti='no'
  calc_cc_times='yes'
  apply_tgain='yes'
  eventdef=')ccgrdlev1'
  rand_pix_size='0'
  badpixfile='bpix1'

dmcopy
  infile='evt1_0[events][grade=0,2,3,4,6,status=0,energy<12000]'

dmcopy 
  infile='evt1_1[events][@flt1]'

destreak

  We run destreak even in cc-mode, but the appropriateness of this has
  been questioned.

tgdetect
  fixedcell='6'

  We can use tgdetect in CC-mode if the zero order region has not been
  blocked.  There will still be a bright point to locate.  
  
tg_create_mask

tg_resolve_events
  osipfile='none'
  osort_hi='0.3'
  osort_lo='0.2'

  The gain calibration in CC-mode is often not as good as in timed
  exposure, and we do not have any chip-y dependent CTI correction
  applied.  Hence we do not use the order sorting table ("osip") and
  we specify a generous "flat" order sorting region.

tgextract

aglc

asphist

  Run for each CCD.

pset ardlib

  To set observation-specific bad-pixel files.

mkgrmf

  Run for -1 and +1 orders, for both MEG and HEG gratings.

mkgarf
  pbkfile='pbk0'
  maskfile='msk1'
  osipfile='CALDB'

  Run for -1 and +1 orders for each CCD and grating.  Note that we
  specify the osip file for the ARF, even though we did not use it
  for order-sorting.

dmarfadd

Summary plots are made by ISIS scripts

LETG/ACIS-S/TE

acis_process_events
  rand_pix_size='0'
  badpixfile='bpix1'

dmcopy
  infile='evt1_0[events][grade=0,2,3,4,6,status=0,energy<12000]' \

dmcopy
  infile='evt1_1[events][@flt1]' \

destreak
  filter='yes'

tgdetect
  fixedcell='6'

tg_create_mask

tg_resolve_events

tgextract
  extract_background='yes'

aglc

asphist

pset ardlib

mkgrmf

mkgarf
  pbkfile='pbk0'
  maskfile='msk1'

dmarfadd

Summary plots are made by ISIS scripts

LETG/ACIS-S/CC

LETG/ACIS-S/TE with findzo

LETG/HRC-S

hrc_process_events
  infile='evt0[events][pha=0:254,status=xxxxxx00xxxx0xxx0000x000x00000xx,@flt1]'
  badpixfile='bpix1'

  We apply the recommended pha and status filters, filter by the time
  intervals in the "flt1" file, and specify the observation-specific bad
  pixel file.

tgdetect
  fixedcell='6'

   We use the cell size recommended for multiple close sources.

tg_create_mask

tg_resolve_events
  eventdef=')stdlev1_HRC'

tgextract
  infile='evt2[(tg_lam,pi)=region($CALDB/data/chandra/hrc/bcf/tgmask2/letgD1999-07-22pireg075_N0001.fits)]'
  extract_background='yes'

  We apply a CALDB filter to reduce background.

tg_bkg

  This sums the background components in the pha file output by tgextract.

dmtype2split
  outfile='pha2_bg_-1[SPECTRUM],pha2_bg_1[SPECTRUM]'

  This produced "Type I" pha files holding the background spectra.

dmextract
  outfile='lc'
  infile='evt2[tg_part=3,tg_m=-1,1, \
	       (tg_r,tg_d)=region($CALDB/data/chandra/hrc/bcf/tgmask2/letgD1999-07-22regN0002.fits\
	       [tg_srcid=1,tg_part=3,tg_m=-1,1,rowid=SOURCE])][bin time=::1000]'

   We compute a light curve for LETG/HRC-S data within the "bow-tie"
   region background, which was also applied by default in tgextract.

dmextract
  outfile='lc_bg'
  infile='evt2[tg_part=3,tg_m=-1,1,\
	       (tg_r,tg_d)=region($CALDB/data/chandra/hrc/bcf/tgmask2/\
	       letgD1999-07-22regN0002.fits[tg_srcid=1,tg_part=3,tg_m=-1,1,\
	       rowid=BACKGROUND_UP,BACKGROUND_DOWN])][bin time=::1000]'

  This extracts the background light curve.

asphist
  dtffile='dtf1'

  This is done for each HRC-S chip, using the observation-specific
  dead-time correction file.

pset ardlib 
  AXAF_HRC-S_BADPIX_FILE='bpix1'

  We set the observation-specific bad pixel files necessary for making
  responses. 

mkgrmf

  This is done for each order of interest.  For LETGS, we make up to
  8th order. 

mkgarf

 This is done for each detector element and order of interest.

dmarfadd

 The grating arf chip components are summed.

Summary plots are made by ISIS scripts