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Hubble Space Telescope
GHRS Instrument Science Report 082

GHRS Instrument Science Report No. 82

"Analysis of Detector Calibrations for the GHRS for Cycles 4, 5
and 6"

Howard H. Lanning, David R. Soderblom, Stephen J. Hulbert,
and Lisa E. Sherbert

May 22, 1997


This report presents the analysis of GHRS D1 and D2 detector
calibrations encompassing Cycles 4, 5, and 6. Calibration tests
examined include: dark count measurements, focus checks, flat-field
count rates, sample mapping function, and line mapping function tests.
Additional flat-field data from Cycles 1 to 3 were processed and
displayed to demonstrate the continuing decreasing trend in the
flat-field lamps response. Results of these analyses indicate the
instrument has remained stable throughout the past three Cycles.