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We present ZTF18aaqjovh (SN 2018bvw), a high-velocity ("broad-lined")stripped-envelope (Type Ic) supernova (Ic-BL SN) discovered in the ZwickyTransient Facility one-day cadence survey. ZTF18aaqjovh shares a number offeatures in common with engine-driven explosions: the photospheric velocity andthe shape of the optical light curve are very similar to that of the Type Ic-BLSN 1998bw, which was associated with a low-luminosity gamma-ray burst (LLGRB)and had relativistic ejecta. However, the radio luminosity of ZTF18aaqjovh isalmost two orders of magnitude fainter than that of SN 1998bw at the samevelocity phase, and the shock velocity is at most mildly relativistic(v=0.06-0.4c). A search of high-energy catalogs reveals no compelling GRBcounterpart to ZTF18aaqjovh, and the limit on the prompt GRB luminosity of$L_{\gamma,\mathrm{iso}} \approx 1.6 \times 10^{48}$ erg/sec excludes aclassical GRB but not an LLGRB. Altogether, ZTF18aaqjovh represents anothertransition event between engine-driven SNe associated with GRBs and "ordinary"Ic-BL SNe.

The Broad-lined Ic Supernova ZTF18aaqjovh (SN 2018bvw): An Optically-discovered Engine-driven Supernova Candidate with Luminous Radio Emission