GHRS Instrument Science Report 054 "Dark Count Statistics for GHRS Detectors: A Test of Noise Rejection with FLYLIM" Lisa E. Sherbert, Stephen J. Hulbert, Ronald L. Gilliland and Joseph P. Skapik Abstract excerpted from the report: GHRS calibration proposal 4012 was designed to obtain the statistical data needed to plan an operational strategy for observing faint targets with the GHRS. The FLYLIM noise rejection strategy is potentially of most use when one is observing an object so faint that source counts are well below the level of the detector dark count. In that case it is possible to reflect multiple-count integrations as instances of higher-than-average noise without the risk of discarding exposures containing genuine signal. The data obtained in proposal 4012 show that when FLYLIM count rejection is used on the GHRS Detector 2 the dark noise is reduced by a factor of four (4) over what is seen well outside South Atlantic Anomaly (SAA). The rejection of some lines of data resulted in an increase in execution time by about 25% over the nominal exposure time.
