Journal Article

Further calibration of the <i>Swift</i> ultraviolet/optical telescope

A. A. Breeveld, P. A. Curran, E. A. Hoversten, S. Koch, W. Landsman, F. E. Marshall, M. J. Page, T. S. Poole, P. Roming, P. J. Smith, M. Still, V. Yershov, A. J. Blustin, P. J. Brown, C. Gronwall, S. T. Holland, N. P. M. Kuin, K. McGowan, S. Rosen, P. Boyd, P. Broos, M. Carter, M. M. Chester, B. Hancock, H. Huckle, S. Immler, M. Ivanushkina, T. Kennedy, K. O. Mason, A. N. Morgan, S. Oates, M. De Pasquale, P. Schady, M. Siegel and D. Vanden Berk

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 3, pages 1687-1700
Published in print August 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16832.x
Further calibration of the Swift ultraviolet/optical telescope

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The Ultraviolet/Optical Telescope (UVOT) is one of three instruments onboard the Swift observatory. The photometric calibration has been published, and this paper follows up with details on other aspects of the calibration including a measurement of the point spread function with an assessment of the orbital variation and the effect on photometry. A correction for large-scale variations in sensitivity over the field of view is described, as well as a model of the coincidence loss which is used to assess the coincidence correction in extended regions. We have provided a correction for the detector distortion and measured the resulting internal astrometric accuracy of the UVOT, also giving the absolute accuracy with respect to the International Celestial Reference System. We have compiled statistics on the background count rates, and discuss the sources of the background, including instrumental scattered light. In each case, we describe any impact on UVOT measurements, whether any correction is applied in the standard pipeline data processing or whether further steps are recommended.

Keywords: instrumentation: detectors; instrumentation: photometers; astrometry; ultraviolet: general

Journal Article.  9449 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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