Table 3: Effective wavelengths, extinction ratios, and counts-to-flux conversion factors for the UVOT filters.

Filter		 $\lambda_{\rm eff}^{{a}}$ $A_{\lambda_{\rm eff}}/E(B-V)^{{b}}$ $F_{\rm conv}^{{c}}$

V		 5460 3.2 (2.2 $\pm$ 0.1) $\times 10^{-16}$
B 4350 4.2 (1.3 $\pm$ 0.1) $\times 10^{-16}$
U 3450 5.2 (1.5 $\pm$ 0.06) $\times 10^{-16}$
UVW1 2600 6.7 (3.5 $\pm$ 0.07) $\times 10^{-16}$
UVM2 2200 9.7 (7 $\pm$ 1) $\times 10^{-16}$
UVW2 1930 8.3 (6.0 $\pm$ 0.4) $\times 10^{-16}$
a
Effective wavelength of the filter in Å.
b
Ratio of $A_{\lambda_{\rm eff}}$, the extinction in magnitudes at the effective wavelength of the filter $\lambda_{\rm eff}$, to E(B-V). For the UV filters (UVW1, UVM2 and UVW2) $A_{\lambda_{\rm eff}}/E(B-V)$ was obtained from Fig. 1 in Seaton (1979), and for the optical (V, B and U) filters the values are derived from the interstellar reddening curve given by Zombeck (1990).
c
Conversion factor from rate (Counts s-1) to flux (erg cm-2 s-1 Å-1) from UVOT in-orbit calibration as of 30 June 2005 (T.S. Poole, priv. comm.).

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