|COS Instrument Handbook for Cycle 25|
Spectroscopic observations with the BOA have had very little demand over the past cycles. For that reason, it has been decided that spectroscopic observations with the BOA will not be supported at the level that is used for the PSA. Spectroscopic observations with the BOA should be performed only if the technical requirement and scientific justification are particularly compelling. Proposers should be aware of the following caveats regarding use of the BOA:
• Further calibrations for the BOA will not be provided by STScI. Either users must determine that they can create calibration files from data in the HST Archive or they must obtain calibrations as part of their observations. Spectroscopic observations using the BOA will be calibrated by calcos, but will be based on reference files primarily derived for use with the PSA and will use a the new TWOZONE extraction algorithm described in Section 3.2.1 of the COS Data Handbook.