Calibration of the Swift-UVOT ultraviolet and visible grisms

N. P.M. Kuin, W. Landsman, A. A. Breeveld, M. J. Page, H. Lamoureux, C. James, M. Mehdipour, M. Still, V. Yershov, P. J. Brown, M. Carter, K. O. Mason, T. Kennedy, F. Marshall, P. W.A. Roming, M. Siegel, S. Oates, P. J. Smith, M. de Pasquale

Research output: Contribution to journalArticle

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Abstract

We present the calibration of the Swift Ultraviolet and Optical Telescope (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 ?1700-5000 Å with a spectral resolution (λ/Δλ) of 75 at λ2600 Å for source magnitudes of u=10-16 mag, while the visible grism covers the range λ2850-6600 Å with a spectral resolution of 100 at λ4000 Å for source magnitudes of b=12-17 mag. This calibration extends over all detector positions, for all modes used during operations. The wavelength accuracy (1σ) is 9 Å in the UV grism clocked mode, 17 Å in the UV grism nominal mode and 22 Å in the visible grism. The range below λ2740 Å in the UV grism and λ5200 Å 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 per cent. The position of the spectrum on the detector only affects the effective area (sensitivity) by a fewper cent in the nominal modes, but varies substantially in the clocked modes. The error in the effective area is from 9 per cent in the UV grism clocked mode to 15 per cent in the visible grism clocked mode.

Original languageEnglish (US)
Pages (from-to)2514-2538
Number of pages25
JournalMonthly Notices of the Royal Astronomical Society
Volume449
Issue number3
DOIs
StatePublished - Jan 1 2015

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ultraviolet telescopes
calibration
spectral resolution
spectroscopy
detectors
wavelength
detector
telescopes
loss
sensitivity

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kuin, N. P. M., Landsman, W., Breeveld, A. A., Page, M. J., Lamoureux, H., James, C., ... de Pasquale, M. (2015). Calibration of the Swift-UVOT ultraviolet and visible grisms. Monthly Notices of the Royal Astronomical Society, 449(3), 2514-2538. https://doi.org/10.1093/mnras/stv408
Kuin, N. P.M. ; Landsman, W. ; Breeveld, A. A. ; Page, M. J. ; Lamoureux, H. ; James, C. ; Mehdipour, M. ; Still, M. ; Yershov, V. ; Brown, P. J. ; Carter, M. ; Mason, K. O. ; Kennedy, T. ; Marshall, F. ; Roming, P. W.A. ; Siegel, M. ; Oates, S. ; Smith, P. J. ; de Pasquale, M. / Calibration of the Swift-UVOT ultraviolet and visible grisms. In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 449, No. 3. pp. 2514-2538.
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abstract = "We present the calibration of the Swift Ultraviolet and Optical Telescope (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 ?1700-5000 {\AA} with a spectral resolution (λ/Δλ) of 75 at λ2600 {\AA} for source magnitudes of u=10-16 mag, while the visible grism covers the range λ2850-6600 {\AA} with a spectral resolution of 100 at λ4000 {\AA} for source magnitudes of b=12-17 mag. This calibration extends over all detector positions, for all modes used during operations. The wavelength accuracy (1σ) is 9 {\AA} in the UV grism clocked mode, 17 {\AA} in the UV grism nominal mode and 22 {\AA} in the visible grism. The range below λ2740 {\AA} in the UV grism and λ5200 {\AA} 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 per cent. The position of the spectrum on the detector only affects the effective area (sensitivity) by a fewper cent in the nominal modes, but varies substantially in the clocked modes. The error in the effective area is from 9 per cent in the UV grism clocked mode to 15 per cent in the visible grism clocked mode.",
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Kuin, NPM, Landsman, W, Breeveld, AA, Page, MJ, Lamoureux, H, James, C, Mehdipour, M, Still, M, Yershov, V, Brown, PJ, Carter, M, Mason, KO, Kennedy, T, Marshall, F, Roming, PWA, Siegel, M, Oates, S, Smith, PJ & de Pasquale, M 2015, 'Calibration of the Swift-UVOT ultraviolet and visible grisms', Monthly Notices of the Royal Astronomical Society, vol. 449, no. 3, pp. 2514-2538. https://doi.org/10.1093/mnras/stv408

Calibration of the Swift-UVOT ultraviolet and visible grisms. / Kuin, N. P.M.; Landsman, W.; Breeveld, A. A.; Page, M. J.; Lamoureux, H.; James, C.; Mehdipour, M.; Still, M.; Yershov, V.; Brown, P. J.; Carter, M.; Mason, K. O.; Kennedy, T.; Marshall, F.; Roming, P. W.A.; Siegel, M.; Oates, S.; Smith, P. J.; de Pasquale, M.

In: Monthly Notices of the Royal Astronomical Society, Vol. 449, No. 3, 01.01.2015, p. 2514-2538.

Research output: Contribution to journalArticle

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AU - Kuin, N. P.M.

AU - Landsman, W.

AU - Breeveld, A. A.

AU - Page, M. J.

AU - Lamoureux, H.

AU - James, C.

AU - Mehdipour, M.

AU - Still, M.

AU - Yershov, V.

AU - Brown, P. J.

AU - Carter, M.

AU - Mason, K. O.

AU - Kennedy, T.

AU - Marshall, F.

AU - Roming, P. W.A.

AU - Siegel, M.

AU - Oates, S.

AU - Smith, P. J.

AU - de Pasquale, M.

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N2 - We present the calibration of the Swift Ultraviolet and Optical Telescope (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 ?1700-5000 Å with a spectral resolution (λ/Δλ) of 75 at λ2600 Å for source magnitudes of u=10-16 mag, while the visible grism covers the range λ2850-6600 Å with a spectral resolution of 100 at λ4000 Å for source magnitudes of b=12-17 mag. This calibration extends over all detector positions, for all modes used during operations. The wavelength accuracy (1σ) is 9 Å in the UV grism clocked mode, 17 Å in the UV grism nominal mode and 22 Å in the visible grism. The range below λ2740 Å in the UV grism and λ5200 Å 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 per cent. The position of the spectrum on the detector only affects the effective area (sensitivity) by a fewper cent in the nominal modes, but varies substantially in the clocked modes. The error in the effective area is from 9 per cent in the UV grism clocked mode to 15 per cent in the visible grism clocked mode.

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Kuin NPM, Landsman W, Breeveld AA, Page MJ, Lamoureux H, James C et al. Calibration of the Swift-UVOT ultraviolet and visible grisms. Monthly Notices of the Royal Astronomical Society. 2015 Jan 1;449(3):2514-2538. https://doi.org/10.1093/mnras/stv408