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 Abstract 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.