  The question whether quiescent black hole X-ray binaries are capable of
powering relativistic outflows is addressed by means of simultaneous
radio/X-ray observations of a nearby system steadily emitting X-rays below 1e-8
times the Eddington luminosity. The robust detection of a radio counterpart
suggests that a synchrotron emitting outflow is being powered by this system,
even though its degree of collimation remains unknown, and hard to investigate.
With the inclusion of the A0620-00 data, the non linear radio/X-ray correlation
for hard state black hole X-ray binaries appears to hold down to very low
quiescent luminosities. However, an increasing number of outliers is being
found at higher luminosities, questioning the universality of such correlation,
or at least its normalization.
