  The intermediate Palomar Transient Factory reports our discovery of a young
supernova, iPTF13bvn, in the nearby galaxy, NGC5806 (22.5Mpc). Our spectral
sequence in the optical and infrared suggests a likely Type Ib classification.
We identify a single, blue progenitor candidate in deep pre-explosion imaging
within a 2{\sigma} error circle of 80 mas (8.7 pc). The candidate has a MB
luminosity of -5.2 +/- 0.4 mag and a B-I color of 0.1+/-0.3 mag. If confirmed
by future observations, this would be the first direct detection for a
progenitor of a Type Ib. Fitting a power law to the early light curve, we find
an extrapolated explosion date around 1.1 days before our first detection. We
see no evidence of shock cooling. The pre-explosion detection limits constrain
the radius of the progenitor to be smaller than a few solar radii. iPTF13bvn is
also detected in cm and mm-wavelengths. Fitting a synchrotron self-absorption
model to our radio data, we find a mass loading parameter of 1.3*10^12 g/cm.
Assuming a wind velocity of 10^3km/s, we derive a progenitor mass loss rate of
3*10^-5Msun/yr. Our observations, taken as a whole, are consistent with a Wolf
Rayet progenitor of the supernova iPTF13bvn.
