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

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D.14. BATMASKWTEVT 163 (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. (buffersize = 32768) [integer ] Size of internal event buffer for processing. (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. (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.
164 APPENDIX D. BAT SOFTWARE TOOL REFERENCE (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. D.14.7 EXAMPLES 1. Computes the mask weights for a source at (RA,DEC) = (257.5500,-28.118) degrees. The event file sw00000001000bnone028.unf has its MASK WEIGHT column overwritten. batmaskwtevt sw00000001000bnone028.unf 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. batmaskwtevt sw00000001000bnone028.unf 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 batmaskwtevt, 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. batmaskwtevt sw00000001000bnone028.unf NONE 0.348 0.112 coord_type=unit distance=1e7 D.14.8 SEE ALSO batmaskwtimg, colfilter D.14.9 LAST MODIFIED Sep 2006
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