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	Figure 1: The SDSS optical spectrum of ROXA J081009.9+384757.0. The dashed line plotted to the right of the Lyman- line is an estimate of the continuum based on the composite quasar spectrum template of Vanden Berk et al. (2001). The dotted lines represent conservative limits to the slope of the continuum. See text for details.
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In the text

	Figure 2: SDSS optical image covering the 22 arcsec error circle of the X-ray source RX J0810.2+3847. The much smaller (4 arcsec) Swift XRT error region associates beyond any doubt the X-ray source to the flat spectrum radio quasar SDSS J081009.9+384757.0.
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In the text

Figure 3: The SED of ROXA J081009.9+384757.0 built using the radio data from the NVSS, FIRST and GB6 radio surveys, microwave upper limits (at 23, 33, 41, 61 and 94 GHz) from WMAP 3-yr data, optical photometry from the SDSS survey, ROSAT (filled circle) and Swift XRT X-ray data (open diamonds) and UVOT upper limits in the V and B filters. The boxes drawn at microwave frequencies represent the 1 and the maximum observed flux range from blazars where the X rays are due to inverse Compton radiation (see text for details). The solid lines in the optical band represent our best estimate and conservative upper limits to the slope of the continuum (see also Fig. 1).

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In the text

Figure 4: The SED of ROXA J081009.9+384757.0 (see Fig. 3) is plotted together with that of 3C 454.3 after scaling to match the radio flux and the redshift of this last blazar. The large filled circles are the fluxes observed during the very large flare of 3C 454.3 in May 2005, while the smaller symbols are non-simultaneous historical data taken from the literature (see Giommi et al. 2006b, for details).

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In the text

	Figure 5: The SED of ROXA J081009.9+384757.0 shown Fig. 3 (converted to luminosity) is overlaid to the Blazar sequence plot of Fossati et al. (1998).
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In the text