GHRS Instrument Science Report 071 "Stability of the GHRS Sensitivity During Cycle 4" Claus Leitherer and Lisa E. Sherbert June 1995 Abstract The sensitivity of the GHRS on Side 1 and Side 2 was monitored approximately every 3 months during Cycle 4. The measurements were done with the ultraviolet flux standard BD+28D4211. No significant time dependence was found for wavelengths > 1200 A on both sides; any accumulated sensitivity changes during Cycle 4 do not exceed about 2%, although the data indicate a decline rate per year of this magnitude. Below 1200 A the sensitivity decreases with time. In April 1995 the sensitivity at 1140 A was 10% lower than measured in April 1994.
