Calibration Product Review for the Faint Object Spectrograph 

Charles D. Keyes, Anuradha P. Koratkar, and Anne L. Kinney
Space Telescope Science Institute


FOS Instrument Science Report CAL/FOS-130
November 1994


Abstract

We present a complete discussion and a synopsis of the Cycle 4 calibration
status of the FOS to date. A chronology and summary is provided of recent
communications to the observer community concerning important FOS calibration
issues including recommended re-processing procedures for certain photometric
and flat field calibrations and discussions of pipeline processing errors
affecting polarimetry and background subtraction. Complete reference guide
tabulations of all recommended FOS reference files and reference tables for
Cycle 4 AS OF 10 NOVEMBER 1994 are given. Equivalent tabulations for
pre-COSTAR observations may be found in cited references. Comprehensive
calibration file and table delivery histories since launch are described and
referenced. ASCII-text and Postscript versions of these tabulations and
histories, which are updated on a continuing basis, may be found on STEIS in
the instrument_news/fos/recommended_reference_files directory and in the
"Instrument Status: Calibration Products and Tools" section of the WWW STScI
FOS Homepage.