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We present optical, radio, and X-ray observations of SN2020bvc (=ASASSN20bs;ZTF20aalxlis), a nearby ($z=0.0252$; $d$=114 Mpc) broad-lined (BL) Type Icsupernova (SN). Our observations show that SN2020bvc shares several propertiesin common with the Ic-BL SN2006aj, which was associated with the low-luminositygamma-ray burst (LLGRB) 060218. First, the 10 GHz radio light curve is on thefaint end of LLGRB-SNe ($L_\mathrm{radio} \approx 10^{37}$erg/s): we model ourVLA observations (spanning 13-43 d) as synchrotron emission from a mildlyrelativistic ($v \gtrsim 0.3c$) forward shock. Second, with Swift and Chandrawe detect X-ray emission ($L_X \approx 10^{41}$erg/s) that is not naturallyexplained as inverse Compton emission or as part of the same synchrotronspectrum as the radio emission. Third, high-cadence ($6\times$/night) data fromthe Zwicky Transient Facility (ZTF) shows a double-peaked optical light curve,the first peak from shock-cooling emission from extended low-mass material(mass $M<10^{-2} M_\odot$ at radius $R>10^{12}$cm) and the second peak from theradioactive decay of Ni-56. SN2020bvc is the first confirmed double-peakedIc-BL SN discovered without a GRB trigger, and shows X-ray and radio emissionsimilar to LLGRB-SNe: this is consistent with models in which the samemechanism produces both the LLGRB and the shock-cooling emission. For four ofthe five other nearby ($z\lesssim0.05$) Ic-BL SNe with ZTF high-cadence data,we rule out a first peak like that seen in SN2006aj and SN2020bvc, i.e. thatlasts $\approx 1$d and reaches a peak luminosity $M \approx -18$. X-ray andradio follow-up observations of future such events will establish whetherdouble-peaked optical light curves are indeed predictive of LLGRB-like X-rayand radio emission.

SN2020bvc: a Broad-lined Type Ic Supernova with a Double-peaked Optical Light Curve and a Luminous X-ray and Radio Counterpart