The SWIFT BAT Software Guide Version 6.3 30 ... - HEASARC - Nasa

168 APPENDIX D. BAT SOFTWARE TOOL REFERENCE
(combmeth = “NONE”) [string ]
Method of combining multiple maps (one of NONE, MIN, MAX or SUM). If NONE, then
multiple maps are output individually. If MIN/MAX/SUM, the minimum/maximum/total
value is output for each pixel.
(distance = 1.0e7) [real ]
Default bat z position if bat z is zero (centimeters).
(maskoffx = 0.0) [real ]
Translational offset to apply to the mask along the BAT X coordinate from its nominal design
position.
(maskoffy = 0.0) [real ]
Translational offset to apply to the mask along the BAT Y coordinate from its nominal design
position.
(maskoffz = 0.0) [real ]
Translational offset to apply to the mask along the BAT Z coordinate from its nominal design
position.
(maskthickness = INDEF) [string ]
Thickness of the lead mask tiles in centimeters. Normally this will be set to INDEF, which
reads the mask thickness from the aperture file. A thickness of 0 cm is permitted.
(distfile=CALDB) [string ]
The ‘distfile’ parameter should point to a FITS file containing an MxNx2 image (or CALDB
to use the default instrument correction in the calibration database). The two planes of the
image are the non-linear distortion of the BAT “plate scale” as a function of position in the
sky image. The values are offsets in tangent plane coordinates (IMX,IMY), and therefore
unitless. The first plane of the image cube is the IMX offset, and the second plane is the
IMY offset. The sense of the offset is (TRUE-APPARENT), i.e. for a measured position in
tangent plane coordinates, the offset values should be *added* to arrive at the true position
in tangent plane coordinates. The images are low-resolution versions of the BAT field of view
in instrumental sky coordinates, and are meant to be interpolated to the desired sampling.
The WCS keywords must specify the image coordinate systems.
(corrections = “default”) [string ]
Comma-separated list of corrections to apply to the mask weighting, or “none” if no corrections
are to be applied. The possible corrections are:
default Default corrections, which is shorthand for: “flatfield,ndets,pcode,maskwt”
flatfield Apply corrections for cosine and edge projection effects
maskwt Apply corrections for mask weighting technique
pcode Apply partial coding corrections
ndets Normalize by number of exposed detectors
subpixelate Use slower but potentially higher fidelity algorithm
forward Reserved for clean procedure
unbalanced Reserved for clean procedure