GHRS Instrument Science Report 051 "GHRS Relative Sensitivity Monitoring" David R. Soderblom, Lisa E. Sherbert, Stephen J. Hulbert, Ronald L. Gilliland and Hashima Hasan Abstract excerpted from the report: GHRS observations of BD+28degrees 4211 since 13 Jan 1992 show that the sensitivity of the GHRS is stable to within 3.6% or better and that the variations seen are consistent with throughput variations due to focus changes and minor centering errors. A plot of the sensitivity over this time is provided with indication of focus changes in the OTA.
