We present an updated calibration of the Swift/UVOT broadband ultraviolet (uvw1, uvm2, and uvw2) filters. The new calibration accounts for the ~1% per year decline in the UVOT sensitivity observed in all filters, and makes use of additional calibration sources with a wider range of colours and with HST spectrophotometry. In this paper we present the new effective area curves and instrumental photometric zeropoints and compare with the previous calibration.
@article{arxiv.1102.4717,
title = {An Updated Ultraviolet Calibration for the Swift/UVOT},
author = {A. A. Breeveld and W. Landsman and S. T. Holland and P. Roming and N. P. M. Kuin and M. J. Page},
journal= {arXiv preprint arXiv:1102.4717},
year = {2015}
}
Comments
4 pages, 3 figures, 2 tables. Presented at GRB 2010 symposium, Annapolis, November 2010 to be published in American Institute of Physics Conference Series