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We report new measurements of the decays $B\to\rho^+ \gamma$, $B \to \rho^0\gamma$ and $B \to \omega\gamma$ using a data sample of $657 \times 10^6$ $B$meson pairs accumulated with the Belle detector at the KEKB $e^+ e^-$ collider.We measure branching fractions ${\cal B}(B^+ \to \rho^+ \gamma) =(8.7^{+2.9}_{-2.7}{}^{+0.9}_{-1.1})\times 10^{-7}$, ${\cal B}(B^0 \to \rho^0\gamma) = (7.8^{+1.7}_{-1.6}{}^{+0.9}_{-1.0}) \times 10^{-7}$ and ${\cal B}(B^0\to \omega \gamma) = (4.0^{+1.9}_{-1.7} \pm 1.3) \times 10^{-7}$. We alsoreport the isospin asymmetry $\Delta (\rho\gamma) =-0.48^{+0.21}_{-0.19}{}^{+0.08}_{-0.09}$; and the first measurement of thedirect CP-violating asymmetry $A_{CP}(B^+ \to \rho^+ \gamma) =-0.11\pm{0.32}\pm{0.09}$, where the first and second errors are statistical andsystematic, respectively.

Measurement of branching fractions, isospin and CP-violating asymmetries for exclusive \boldmath$b \to d\gamma$ modes