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Hubble Space Telescope
GHRS Instrument Science Report 085

GHRS Instrument Science Report No. 85

"Redetermination of Sensitivity for Grating G140L"

L. E. Sherbert, D. R. Soderblom, and J. Mack

May 23, 1997


This ISR describes a re-determination of the sensitivity function for
grating G140L of the GHRS. This was done after it was determined that
the existing functions left significant and systematic residual errors.
Definitions of the sensitivity and vignetting functions are provided,
and the procedures used to derive them are described and illustrated.
Some intrinsic limitations are described of the process of deriving
sensitivity for the GHRS and for the ultraviolet in general. New
baseline sensitivity functions for G140L, and ones that are
time-dependent have now been installed in CDBS.