Photometric Calibration of the Swift Ultraviolet/Optical Telescope

Details Photometric Calibration of the Swift Ultraviolet/Optical Telescope Photometric Calibration of the Swift Ultraviolet/Optical Telescope

2007-08-16

arxiv.org/abs/0708.2259v2

Mon.Not.Roy.Astron.Soc.383:627-645,2008

Astronomy and Astrophysics

Astrophysics

Minor improvements after referees report. Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12563.x

We present the photometric calibration of the Swift UltraViolet/Optical Telescope (UVOT) which includes: optimum photometric and background apertures, effective area curves, colour transformations, conversion factors for count rates to flux, and the photometric zero points (which are accurate to better than 4 per cent) for each of the seven UVOT broadband filters. The calibration was performed with observations of standard stars and standard star fields that represent a wide range of spectral star types. The calibration results include the position dependent uniformity, and instrument response over the 1600-8000A operational range. Because the UVOT is a photon counting instrument, we also discuss the effect of coincidence loss on the calibration results. We provide practical guidelines for using the calibration in UVOT data analysis. The results presented here supersede previous calibration results.

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