Dust Extinction toward SN 2014J in M82

We derive the extinction toward SN 2014J, a Type Ia supernova in M82, as a function of wavelength from the far ultraviolet to the near infrared by modeling the observed color excesses in terms of a mixture of silicate and graphite. With A _v ~ 1.9 mag and R _V ~ 1.7-1.8, the derived extinction law differs substantially from those of the Galaxy and the Magellanic clouds.