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Publication Detail
Calibration of the Swift-UVOT ultraviolet and visible grisms
  • Publication Type:
    Journal article
  • Publication Sub Type:
  • Authors:
    Kuin NPM, Landsman W, Breeveld A, Page M, Lamoureux H, James C, Mehdipour M, Still M, Yershov , Brown P, Carter M, Mason KO, Kennedy T, Marshall F, Roming PWA, Siegel M, Oates S, Smith PJ, De Pasquale M
  • Publisher:
  • Publication date:
  • Pagination:
    2514, 2538
  • Journal:
    Monthly Notices of the Royal Astronomical Society
  • Volume:
  • Status:
  • Print ISSN:
  • Keywords:
    techniques: spectroscopy - instrumentation: spectrographs
  • Addresses:
    Space Telescope Science Institute

    NASA Ames Research Center
    Moffett Field

    Georg P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy
    College Station

    Satellite Applications Catapult
    Harwell, Oxford

    IASF Palermo

    NASA Goddard Space Flight Center

    Department of Astronomy & Astrophysics
    University Park

    South West Research Institute
    San Antonio

    The University of Texas at San Antonio
    San Antonio

    Instituto de Astrofisica de Andalucia (IAA-CSIC)
  • Notes:
    Accepted February 23, 2015.
We present the calibration of the Swift UVOT grisms, of which there are two, providing low-resolution field spectroscopy in the ultraviolet and optical bands respectively. The UV grism covers the range \lam 1700-5000 Angstrom with a spectral resolution ($\lambda/\Delta\lambda$) of 75 at 2600 Angstrom for source magnitudes of $u$=10-16 mag, while the Visible grism covers the range 2850-6600 Angstrom with a spectral resolution of 100 at 4000 Angstrom for source magnitudes of $b$=12-17 mag. This calibration extends over all detector positions, for all modes used during operations. The wavelength accuracy (1-sigma) is 9 Angstrom in the UV grism clocked mode, 17 Angstrom in the UV grism nominal mode and 22 Angstrom in the Visible grism. The range below 2740 Angstrom in the UV grism and 5200 Angstrom in the Visible grism never suffers from overlapping by higher spectral orders. The flux calibration of the grisms includes a correction we developed for coincidence loss in the detector. The error in the coincidence loss correction is less than 20\%. The position of the spectrum on the detector only affects the effective area (sensitivity) by a few percent in the nominal modes, but varies substantially in the clocked modes. The error in the effective area is from 9\% in the UV grism clocked mode to 15\% in the Visible grism clocked mode.
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