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exposure_map

Generates an exposure map, or a set of exposure maps for different energies, from a livetime cube written by gtltcube.

Prerequisites

Input Files:
  • Livetime or Exposure cube FITS file from gtltcube
  • Optionally, a counts map FITS file from gtbin, for which exposure_map should match the coordinate projection and gridding.  The counts map also specifies the effective area response functions for exposure_map to use.
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General Parameters

  infile [file]
    Exposure or Livetime cube input file.
     
  cmfile [file]
    Count map input file (NONE to determine map geometry from paramenters).
     
  outfile [file]
    Exposure map output file name (FITS format image).
     
  irfs= "DC2" [string]
    Response function. Default DC2 means the sum of classA and class B.
     
  nxpix = 1 [int]
    Size of the X axis in pixels. Default (1) for full sky.
     
  nypix = 1 [int]
    Size of the Y axis in pixels. Default (1) to copy nxpix, or full sky.
     
  binsz = 1.0 [float]
    Image scale (in degrees/pixel).
     
  coordsys = "CEL" [string]
    Coordinate system, CEL or GAL.
     
  xref = 0. [float]
    First coordinate of image center in degrees (RA or Galactic l). (default 0)
     
  yref = 0. [float]
    Second coordinate of image center in degrees (DEC or Galactic b). (default 0)
     
  axisrot = 0. [float]
    Rotation angle of image axis, in degrees. (default 0)
     
  (proj = "AIT") [string]
    Coordinate projection (AIT|ZEA|ARC|CAR|GLS|MER|NCP|SIN|STG|TAN); see Calabretta & Greisen 2002, A&A, 395, 1077 for definitions of the projections.  Must be AIT, ZEA, or CAR for auto full sky.
     
  emin = 30 [float]
    Start value for first energy bin (MeV); must be >=30 MeV.
     
  emax = 200000 [float]
    Stop value for last energy bin; must be <=200 GeV.
Will use this if enumbins is 1.
     
  enumbins [int]
    Number of logarithmically uniform energy bins, defaults to 8.
     
  (bincalc = "CENTER") [string]
   

How are energy layers computed from count map ebounds?  Options are CENTER and EDGE.
     
  (filter = no default) [string]
    Filter expression (FTOOLS style).
     
  (table = "Exposure") 
   

Exposure cube extension.
Hidden parameters
  (chatter = 2) [int]
    Chattiness of output.
     
  (clobber = "yes") [boolean]
    Overwrite existing output files with new output files.
     
  (debug = "no") [boolean]
    Debugging mode activated.
     
  (gui = "no") [boolean]
    Gui mode activated.
     
  (mode = "ql") [string]
    Mode of automatic parameters.

Also See

 

Owned by: Toby Burnett

Generated on: Mar 16 21:53:43 2006

Last updated by: Chuck Patterson 03/20/2006