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We present optical R-band light curves of the double gravitationally lensedquasar FBQ 0951+2635 from observations obtained at the Nordic Optical Telescopebetween March 1999 and June 2001. A time delay of 16 +/- 2 days (1 sigma) isdetermined from the light curves. New constraints on the lensing geometry areprovided by the position and ellipticity of the lensing galaxy. For a (Omega_m,Omega_Lambda) = (0.3, 0.7) cosmology, the time delay yields a Hubble parameterof H_0 = 60^{+9}_{-7} (random, 1 sigma) +/- 2 (systematic) km/s/Mpc for asingular isothermal ellipsoid model and H_0 = 63^{+9}_{-7} (random, 1 sigma)+/- 1 (systematic) km/s/Mpc for a constant mass-to-light ratio model. In bothmodels, the errors are mainly due to the time-delay uncertainties.Non-parametric models yield H_0 = 64^{+9}_{-7} (random, 1 sigma) +/- 14(systematic) km/s/Mpc.Comment: 7 pages, 7 figures. Accepted for publication in A&

An optical time delay for the double gravitational lens system FBQ 0951+2635