An Updated Ultraviolet Calibration for the Swift/UVOT
A. A. Breeveld, W. Landsman, S. T. Holland, P. Roming, N. P. M. Kuin,, M. J. Page
TL;DR
This paper provides an updated calibration of the Swift/UVOT ultraviolet filters, correcting for sensitivity decline and improving accuracy using new calibration sources and HST spectrophotometry.
Contribution
It introduces revised effective area curves and photometric zeropoints, enhancing the calibration accuracy of UVOT ultraviolet filters.
Findings
Sensitivity declines by ~1% per year across filters
New calibration sources improve accuracy
Updated effective area curves and zeropoints provided
Abstract
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.
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