|Space Telescope Science Institute|
|COS Instrument Handbook Cycle 23|
The COS Instrument Handbook describes the design, performance, operation, and calibration of the Cosmic Origins Spectrograph. It is meant to be the principal reference manual for users of COS. This handbook is written and maintained at STScI. While it presents the best available information about COS at the time of the most recent update, tabulated parameters, such as dark rates or sensitivities, can evolve with time during a cycle.This handbook is not meant to be the primary reference for COS data reduction or analysis. That information is provided in the COS Data Handbook. For quick reference, information on COS data products is provided in Chapter 188.8.131.52 Document Conventions
• Terms, words, or phrases that are to be entered by the user in a literal way in an HST proposal are shown in a typewriter or Courier font, such as “COS/FUV” or “TIME-TAG”.
• Names of software packages or commands (such as calcos) are shown in boldface.