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

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D.15. BATMASKWTIMG 169 nearfield Near field corrections for ground calibration analysis only • The “pcode” and “ndets” corrections require the user to supply the detmask keyword. (detmask = “NONE”) [string ] Name of a detector quality map file. This should be an image file with the same dimensions as the detector plane map. A pixel value of 0 indicates the detector is enabled, and a non-zero value indicates disabled. A default value of NONE implies all detectors are on, except for the BAT detector gap regions. This map is only used for computing the fraction of illuminated pixels. The output mask weight map contains a value of zero for all bad quality pixels. detmask. (subpixsize = 0.02) [real ] Size of detector subpixels used in computing mask weighting, in centimeters. Can be no larger than 0.02 cm. (teldef = “CALDB”) [string ] BAT instrument telescope description file, which defines instrument-to-spacecraft alignments. Must be specified when celestial coordinates are provided. If the CALDB database is set up, then CALDB can also be specified. (gapval = 0.0) [real ] Value to place in image cells where detector gaps are located. (origin z = 0) [real ] For ground testing with a near-field source. The position of the origin of coordinates (in cm), to which the source position is referred. (maskwtswgain = 0.04) [real ] Mask weight technique software gain correction factor. When corrections=maskwt, the weights are divided by (1+maskwtswgain). This is correction is software algorithm dependent and not intended to be changed by the user. (clobber = NO) [boolean ] If the output file already exists, then setting “clobber = yes” will cause it to be overwritten. (chatter = 2) [integer, 0 - 5 ] Controls the amount of informative text written to standard output. Setting chatter = 1 produces a basic summary of the task actions; chatter = 2 (default) additionally prints a summary of input parameters; chatter = 5 prints debugging information. (history = YES) [boolean ] If history = YES, then a set of HISTORY keywords will be written to the header of the specified HDU in the output file to record the value of all the task parameters that were used to produce the output file.
170 APPENDIX D. BAT SOFTWARE TOOL REFERENCE D.15.7 EXAMPLES 1. Computes the mask weights for a source at (RA,DEC) = (257.5500,-28.118) degrees. The output is sent to the image maskwt.img. batmaskwtimg maskwt.img attitude.dat 257.5500 -28.118 2. Computes mask weights for a source which is fixed in detector coordinates. The the tangentplane coordinates are provided (tan(theta x) and tan(theta y)), with the source at a distance of 10 7 cm = 100 km. Because no attitude file is needed, NONE is specified. batmaskwtimg maskwt.img NONE 0.348 0.112 coord_type=tanxy distance=1e7 3. Computes mask weights for a source which is fixed in detector coordinates. The X and Y components of the unit vector are given; the Z unit vector is computed implicitly by batmaskwtimg, so that the full unit vector is (0.348, 0.112, 0.931). The source is placed at a distance of 10 7 cm = 100 km. batmaskwtimg maskwt.img NONE 0.348 0.112 coord_type=unit distance=1e7 D.15.8 SEE ALSO batmaskwtevt D.15.9 LAST MODIFIED Apr 2007
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