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

108 APPENDIX D. BAT SOFTWARE TOOL REFERENCE
RATE Source count rate (units from image)
RATE is used if the image has rate-like units. Type=D, Vector.
RATE ERR Source count rate formal uncertainty (1 sigma; units from image). Type=D, Vector.
CENT RATE Source count rate derived from the pixel nearest to the catalog position. Type=D,
Vector.
COUNTS Source counts (units from image)
COUNTS is used if the image does not have rate-like units. Type=D, Vector.
COUNTS ERR Source counts formal uncertainty (1 sigma; units from image). Type=D, Vector.
CENT COUNTS Source counts derived from the pixel nearest to the catalog position. Type=D,
Vector.
BKG Local background intensity (units from image). Type=D, Vector.
BKG ERR Local background intensity formal uncertainty (1 sigma; units from image). Type=D,
Vector.
BKG VAR Local background standard deviation (units from image). Type=D, Vector.
SNR Source signal to noise ratio (defined as RATE/BKG VAR). Type=D, Vector.
NPIXSOU Number of valid pixels in the source window. Type=J, Unit=pixel.
NPIXBKG Number of valid pixels in the background window. Type=J, Unit=pixel.
DETECT METHOD Method used for source detection:
1=Cell detection
2=PSF fit.
Type=J.
CHI2 Chi 2 value in PSF fit. Type=D, Vector.
DOF Number of degrees of freedom in PSF fit. Type=D, Vector.
CHI2 NU Reduced Chi 2 value in PSF fit. Type=D, Vector.
DETECT STATUS Source detection status code; entries with non-zero DETECT STATUS are
deleted when keepbadsources=‘NO’; One of:
0=OK;
-1=Too many pixels detected;
-2=No pixels detected;
-3=Source touches border of image;
-4=Source error radius did not fit in source window.
-5=PSF fit failed (source was likely out of bounds)
Type=J.
CONSTRAINT FLAG PSF fitting constraint flag; Describes which parameters of the PSF
model were fixed; Sum of:
1=IMX fixed;
2=IMY fixed;
4=COUNTS/RATE fixed;
8=PSF width fixed.
Type=J.