Photometric calibration of the Swift ultraviolet/optical telescope
T. PooleMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTA. A. BreeveldMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTM. J. PageMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTV. La ParolaNASA/Goddard Space Flight Center, Greenbelt, MD 20771, USAK. L. PageUniversities Space Research Association, 10211 Wincopin Circle, Suite 500, Columbia, MD 21044, USAP. W. A. RomingDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAN. P. M. KuinMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTPeter J. BrownDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAC. GronwallDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAS. HunsbergerDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAS. KochDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAK. O. MasonMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTP. SchadyMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTDaniel Vanden BerkDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAA. J. BlustinMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTPatricia T. BoydNASA/Goddard Space Flight Center, Greenbelt, MD 20771, USAPatrick S. BroosDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAM. CarterMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTM. ChesterDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAAntonino CucchiaraDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAB. HancockMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTH. HuckleMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTS. ImmlerNASA/Goddard Space Flight Center, Greenbelt, MD 20771, USAM. IvanushkinaDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAT. KennedyMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTF. E. MarshallNASA/Goddard Space Flight Center, Greenbelt, MD 20771, USAA. MorganDepartment of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAS. B. PandeyMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTM. De PasqualeMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTPhil SmithMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NTM. StillNASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
2007en
ABI
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 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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