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the calibrated data in the HST archive could be improved by recalibration, although the improvements are not always significant. In the past, instruments that undergo evolution of calibration files or calibration software often required users to carry out their own recalibrations at their home sites. With OTFC, the HST data archives carry out the recalibration.
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Currently, for example, HST data are calibrated as they are received at the STScI. Raw and calibrated data are stored in the HST archive (DADS). Frequently, users must recalibrate the data at their home sites to take advantage of better calibration files or software. A large fraction (over 90%) of
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The main goals behind the implementation of the OTFC system are to take advantage of better calibration files and the much smaller storage area required if only raw files are kept in the archives.
60:(OTFC) system calibrates data when a user's request for the data is processed so that users can obtain data that are calibrated with up-to-date calibration files, parameters, and software.
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The OTFC processing system was developed at the
Canadian Astronomy Data Centre (CADC) and the
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Please help update this article to reflect recent events or newly available information.
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76:(STScI). The OTFC system currently provides data calibration for the
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72:(ST-ECF) and is implemented at both sites and at
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118:Lubow, Stephen; Pollizzi, Joseph (1999-01-01).
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188:"The 'On-the-Fly' Calibration System"
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