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

176 APPENDIX D. BAT SOFTWARE TOOL REFERENCE
rearth = 6378.1 [real ]
The effective radius of the earth in kilometers. The default value is the mean equatorial
radius (a conservative number).
rmoon = 16.0 [real ]
The effective radius of the moon in arcminutes. The default value is conservatively set at 0.5
arcminutes larger than the true value.
rsun = 16.5 [real ]
The effective radius of the sun in arcminutes. The default value is conservatively set at 0.5
arcminutes larger than the true value.
method = “position” [string ]
Time segmentation method, used for subdividing good time intervals. For method=“time”,
good time intervals are divided into subintervals no larger than timesegtol seconds. For
method=“position”, good time intervals are divided so that the spacecraft and earth/moon/sun
move no more than timesegtol arcminutes.
timesegtol = 0.0 [real ]
Time segmentation parameter (see “method” above). Generally smaller values will provide
higher fidelity, but take longer to compute. A value of zero indicates the defaults of 3 arcmin
/ 10 seconds should be used.
occultation [string ]
Either “any” or “fraction”. See “outfile” above.
constraints = “EARTH” [string ]
A comma-separated list of the constraints to check (EARTH, MOON and/or SUN). Note
that automatic inclusion of the MOON and SUN is not recommended, because both are
comparable to the size of a BAT point source and may confuse the source detection software.
gtifile = “INFILE” [string ]
Name of file containing the good time interval extension. The file is searched for the first
extension matching “*GTI*”. A value of “INFILE” indicates to search the input file. A value
of “NONE” indicates to use the TSTART/TSTOP image header keywords.
(multfiles = “NONE”) [string ]
Comma-separated list of image filenames to be corrected using the calculated correction image
(or “@filename.lis” to supply a list of files in filename.lis). Images are corrected IN PLACE
(i.e. no back-up is made) by MULTIPLYING the original image values by the correction.
(divfiles = “NONE”) [string ]
Comma-separated list of image filenames to be corrected using the calculated correction image
(or “@filename.lis” to supply a list of files in filename.lis). Images are corrected IN PLACE
(i.e. no back-up is made) by DIVIDING the original image values by the correction.
(algorithm = “CONTOUR”) [string ]
Name of algorithm to use, either IMAGE or CONTOUR. The IMAGE method computes
visibility for each pixel; the CONTOUR method computes the contours of each object in pixel
coordinates. By virtue of the algorithms, the two results are slightly different (CONTOUR
produces slightly larger occultation regions).