Filter Profile Service
A repository of Filter information for the VO
Grant PID2020-112494GBI00 funded by
Astronomy (7574)Planetary science (616)Earth Obs. (2439)

Swift :The Swift Gamma-Ray Burst Mission
Swift/UVOT :Swift's Ultraviolet/Optical Telescope (UVOT)

Swift/UVOT.UVW2_fil2023.442109.912052.501600.004310.00744.22744.845.45e-9SwiftUVOTSwift UVOT UVW2 filter transmission (filter only)
Swift/UVOT.UVW2_trn2049.892130.692075.691600.004310.00672.52753.355.37e-9SwiftUVOTSwift UVOT UVW2 filter full transmission
Swift/UVOT.UVW22054.612140.262083.951597.493479.70667.73755.145.36e-9SwiftUVOTUVOT UVW2 filter effective area
Swift/UVOT.UVM2_fil2246.312271.292244.311600.003110.00530.47785.584.67e-9SwiftUVOTSwift UVOT UVM2 filter transmission (filter only)
Swift/UVOT.UVM22246.432272.712245.031699.082964.30533.85787.634.68e-9SwiftUVOTUVOT UVM2 filter effective area
Swift/UVOT.UVM2_trn2248.592274.022246.561605.693110.00532.04786.134.66e-9SwiftUVOTSwift UVOT UVM2 filter full transmission
Swift/UVOT.UVW12580.742688.462681.671614.344730.01801.92921.004.15e-9SwiftUVOTUVOT UVW1 filter effective area
Swift/UVOT.UVW1_trn2628.382726.302715.681600.005970.00831.94926.844.02e-9SwiftUVOTSwift UVOT UVW1 filter full transmission
Swift/UVOT.UVW1_fil2640.532763.972755.791600.005970.00868.60940.994.05e-9SwiftUVOTSwift UVOT UVW1 filter transmission (filter only)
Swift/UVOT.U3467.053492.673520.883017.594781.22662.501457.113.63e-9SwiftUVOTUVOT U filter effective area
Swift/UVOT.U_trn3469.553495.113523.783010.004794.86658.461460.593.64e-9SwiftUVOTSwift UVOT U filter full transmission
Swift/UVOT.U_fil3472.183499.023529.903010.064797.89672.861465.673.64e-9SwiftUVOTSwift UVOT U filter transmission (filter only)
Swift/UVOT.white3325.214003.783875.621597.497820.433548.071678.004.55e-9SwiftUVOTUVOT white filter effective area
Swift/UVOT.white_trn3359.464040.303907.981600.007928.903542.811707.874.54e-9SwiftUVOTSwift UVOT white filter full transmission
Swift/UVOT.B4349.564377.974345.283702.384995.23866.224088.506.48e-9SwiftUVOTUVOT B filter effective area
Filter Description

Filter ID (?) :Swift/UVOT.B
Description (?) :UVOT B filter effective area
Phot.System (?) :UVOT
Detector Type (?) :Photon counter
Band Name (?) :B
Obs. Facility (?) :Swift
Instrument (?) :UVOT
Comments (?) :Take into account that there is a time-dependent, and filter-dependent decline in sensitivity for the UVOT (which reaches as much as ~30% in UVW2) since launch, and that the filter effective areas provided reflect the case at approximately mission start, so any computation of expected output in the UVOT at a given epoch after mission start, should take these degradation factors into account. The current document describing the degradation is available at

Mathematical properties

Property Calculated Specified Unit
λref (?) : 4349.56 ------- (Angstrom)
λmean (?) : 4377.97 ------- (Angstrom)
λcen (?) : 4379.85 ------- (Angstrom)
λeff (?) : 4345.28 ------- (Angstrom)
λpeak (?) : 4282.49 ------- (Angstrom)
λpivot (?) : 4349.56 ------- (Angstrom)
λphot (?) : 4362.97 ------- (Angstrom)
λmin (?) : 3702.38 ------- (Angstrom)
λmax (?) : 4995.23 ------- (Angstrom)
Weff (?) : 866.22 ------- (Angstrom)
FWHM (?) : 978.33 ------- (Angstrom)
Af/AV (?) : 1.31 ------- ()
Fsun (?) : 177.83 ------- (erg/cm2/s/A)

Effective area

Data file: ascii, VOTable

Reference for filter response: HEASARC CALDB

Transmission components: Filter + Instrument

Calibration properties

Vega System
PropertySpecified Calculated Unit
Zero Point (?) : ------- 6.47878e-9(erg/cm2/s/A)
  ------- 4088.50(Jy)
ZP Type (?) : Pogson
PhotCal ID (?) : Swift/UVOT.B/Vega

AB System
PropertySpecified Calculated Unit
Zero Point (?) : ------- 5.75381e-9(erg/cm2/s/A)
  ------- 3631.00(Jy)
ZP Type (?) : Pogson
PhotCal ID (?) : Swift/UVOT.B/AB

ST System
PropertySpecified Calculated Unit
Zero Point (?) : ------- 3.631e-9(erg/cm2/s/A)
  ------- 2291.38(Jy)
ZP Type (?) : Pogson
PhotCal ID (?) : Swift/UVOT.B/ST

Filter added: 2014-01-17 16:26:02
Last update: 2021-07-27 20:39:05
Swift/UVOT.B_trn4350.304378.794345.963589.525090.04871.934087.876.48e-9SwiftUVOTSwift UVOT B filter full transmission
Swift/UVOT.B_fil4392.044420.934384.903601.995114.86865.994091.346.36e-9SwiftUVOTSwift UVOT B filter transmission (filter only)
Swift/UVOT.V5425.335439.645411.454932.606001.23655.673657.873.73e-9SwiftUVOTUVOT V filter effective area
Swift/UVOT.V_trn5426.265440.575412.384688.446133.26659.823657.483.72e-9SwiftUVOTSwift UVOT V filter full transmission
Swift/UVOT.V_fil5467.495482.025453.254705.856180.49729.793630.983.64e-9SwiftUVOTSwift UVOT V filter transmission (filter only)
Swift/UVOT.white_fil4379.885518.514805.371600.008000.003825.152103.963.29e-9SwiftUVOTSwift UVOT white filter transmission (filter only)

Filter Plots (using a common λ range)

(Plot them zoomed to their own λ range)

© SVO,   (SVO Privacy Policy),   10625 filters available,   Last update: 2022-08-30
If your research benefits from the use of the SVO Filter Profile Service, we would appreciate if you could include the following acknowledgement in your publication:

This research has made use of the Spanish Virtual Observatory ( project funded by MCIN/AEI/10.13039/501100011033/ through grant PID2020-112949GB-I00

and we would appreciate if you could include the following references in your publication: