screen (version 3.2)

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This routine runs xselect on the unfiltered event files to produce the filtered event files. The following screening criteria are applied:

SAA==0 (not in South Atlantic Anomaly)
ELV > 10 (sufficiently far from limb of Earth)
ACS==0 (Attitude control in fine guidance mode)
ANG_DIST > 0 && ANG_DIST < 0.01 (Angular distance from the nominal pointing is below threshold)

COR > 6 (Rigidity of Earth's magnetic field high enough to shield the instruments from particles)
FOV==0 (Telescope is pointing at the sky)
BR_EARTH > 20 (far enough from the limb of the bright Earth so that light leaks will not affect the CCDs)
Sn_SATFm != 1 (Telemetry is not saturated )
T_DY_NT <0 || T_DY_NT > 16 per CCD (The time since the last day-night transition above threshold)
T_SAA < 0 || T_SAA > 16 per CCD (The time since the last exit from the South Atlantic Anomaly above threshold)
Only grade 0, 2, 3, and 4 events are extracted.
The data are cleaned with sisclean which removes hot and flickering pixels.

COR>4 (Rigidity of Earth's magnetic field high enough to shield the instruments from particles)
G2_H0+G2_H2+G3_H0+G3_H2 < 45
G2_H0+G2_H2+G3_H0+G3_H2 < 0.45*COR**2-13*COR+125
RBM_CONT < 100
Gn_L1 > 0 (The L1 count rate is above zero )
A region filter is applied to GIS data to filter out the noisy edges of the detectors and the calibration source.
The data are cleaned with gisclean which applies a PI - RTI rejection criterion

Note that the exact screening criteria applied to each event file are recorded in the processing log.

FTOOLS called:

Utilities called: