Photometric Calibration of the Swift Ultraviolet/Optical Telescope
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 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.
Keywords
Cite
@article{arxiv.0708.2259,
title = {Photometric Calibration of the Swift Ultraviolet/Optical Telescope},
author = {T. S. Poole and A. A. Breeveld and M. J. Page and W. Landsman and S. T. Holland and P. Roming and N. P. M. Kuin and P. J. Brown and C. Gronwall and S. Hunsberger and S. Koch and K. O. Mason and P. Schady and D. Vanden Berk and A. J. Blustin and P. Boyd and P. Broos and M. Carter and M. M. Chester and A. Cucchiara and B. Hancock and H. Huckle and S. Immler and M. Ivanushkina and T. Kennedy and F. Marshall and A. Morgan and S. Pandey and M. de Pasquale and P. J. Smith and M. Still},
journal= {arXiv preprint arXiv:0708.2259},
year = {2010}
}
Comments
Minor improvements after referees report. Accepted for publication in MNRAS