Photometric calibration of the Swift ultraviolet/optical telescope

T.~S. Poole, A.~A. Breeveld, M.~J. Page, W. Landsman, S.~T. Holland, P. Roming, N.~P.~M. Kuin, P.~J. Brown, C. Gronwall, S. Hunsberger, S. Koch, K.~O. Mason, P. Schady, D. vanden Berk, A.~J. Blustin, P. Boyd, P. Broos, M. Carter, M.~M. Chester, A. CucchiaraB. Hancock, H. Huckle, S. Immler, M. Ivanushkina, T. Kennedy, F. Marshall, A. Morgan, S.~B. Pandey, M. de Pasquale, P.~J. Smith, M. Still

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Abstract

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 broad-band 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 1600–8000 Å 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.
Original languageEnglish
Pages (from-to)627-645
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume383
Issue number2
DOIs
Publication statusPublished - 11 Jan 2008

Keywords

  • instrumentation: photometers, techniques: photometric, ultraviolet: general, Astrophysics

Cite this

Poole, T. S., Breeveld, A. A., Page, M. J., Landsman, W., Holland, S. T., Roming, P., Kuin, N. P. M., Brown, P. J., Gronwall, C., Hunsberger, S., Koch, S., Mason, K. O., Schady, P., vanden Berk, D., Blustin, A. J., Boyd, P., Broos, P., Carter, M., Chester, M. M., ... Still, M. (2008). Photometric calibration of the Swift ultraviolet/optical telescope. Monthly Notices of the Royal Astronomical Society, 383(2), 627-645. https://doi.org/10.1111/j.1365-2966.2007.12563.x