Paper II: Calibration of the Swift ultraviolet/optical telescope
Abstract
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
Cite
@article{arxiv.1004.2448,
title = {Paper II: Calibration of the Swift ultraviolet/optical telescope},
author = {A. A. Breeveld and P. A. Curran and E. A. Hoversten and S. Koch and W. Landsman and F. E. Marshall and M. J. Page and T. S. Poole and P. Roming and P. J. Smith and M. Still and V. Yershov and A. J. Blustin and P. J. Brown and C. Gronwall and S. T. Holland and N. P. M. Kuin and K. McGowan and S. Rosen and P. Boyd and P. Broos and M. Carter and M. M. Chester and B. Hancock and H. Huckle and S. Immler and M. Ivanushkina and T. Kennedy and K. O. Mason and A. N. Morgan and S. Oates and M. de Pasquale and P. Schady and M. Siegel and D. Vanden Berk},
journal= {arXiv preprint arXiv:1004.2448},
year = {2010}
}
Comments
Accepted for publication in MNRAS. 15 pages, 21 figures, 4 tables