This website is kept for archival purposes only and is no longer updated.
MIRRORS
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Focal length
Energy bandpass
Number & diameter
Effective area (on-axis
point source)
Field-of-view (FWHM)
Angular resolution (FWHM)
Point spread function (FWHM)
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8 m
20 to 40 keV
1, 40 cm
~100 cm2
10 arcmin
< 2 arcmin
< 4 mm
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65 to 80 keV
3, 30 cm
~150 cm2
2 to 3 arcmin
0.5 to 1 arcmin
1 to 2 mm
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DETECTORS
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Subsystems
Detector material
Detector active area
Pixel pitch
Active shielding
Collimator FO
Energy bands
Energy resolution (FWHM)
Efficiency
Background inside the
PSF (cnts/s)
3-sigma spectral sensitivity
(mCrabs in 12 hours)
LDB sensitivity (mCrabs
in 21 day flight)
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4 detector/shield units
CdZnTe (CZT)
2.43 x 2.43 x 0.2 cm
380 microns or 10 arcsec
3 cm CsI
100 FWHM
20 to 40 keV
< 2 keV
100%
7.8 x 10-4
~100
20
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65 to 80 keV
< 5 keV
> 95%
3.4 x 10-4
700
90
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GONDOLA
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Pointing mechanism
Pointing stability
Pointing accuracy
Pointing knowledge
Mirror to detector alignment
knowledge (realtime)
Power
Weight
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3 gyros & momentum
wheels
±5 arcsec RMS
< ±15 arcsec
~1 arcsec
40 microns (1 arcsec)
300 Watts
1500 kg
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