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Photometric Calibration issues
Updated July 18, 2008The 20070522 release of the Swift/UVOTA CALDB contains new photometric zero points for the UVOT. These zero points, and additional photometric calibrations, are described in detail in Poole, et al. (2008, MNRAS 383, 627). These new calibrations supersede all previous UVOT calibrations. The 20070522 CALDB contains revised:
- photometric zero points
- colour transformations
- count-rate to flux density conversion factors
- coincidence loss corrections
- effective area curves for each filter
- Galactic and zodiacal light data
- quickmag data
- point-spread functions
The UVOT team strongly recommends that all users update to the most recent version of the CALDB. Details of the new calibration can be found on the Swift UVOT Calibration Documents page which is part of the Swift CALDB Web site.
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