STScI Logo

Hubble Space Telescope
GHRS Instrument Science Report 089

GHRS Instrument Science Report No. 89

"Summary of the Post-COSTAR Side 2 Sensitivity Monitors for GHRS"

Lisa E. Sherbert

September 24, 1997


The sensitivity of the GHRS on Side1 and Side2 has been measured
approximately every 3 months since Cycle4. The measurements were done
with the ultraviolet flux standard BD+284211. Significant time
dependence was detected in the Side1 data, and led to a recalibration
of the G140L sensitivity, as discussed in GHRS-ISR-085. Trends are also
detected in the Side2 sensitivity monitors, although they are much less
than those found for G140L.