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We present multi-frequency monitoring observations of the black hole X-raybinary V404 Cygni throughout its June 2015 outburst. Our data set includesradio and mm/sub-mm photometry, taken with the Karl G. Jansky Very Large Array,Arc-Minute MicroKelvin Imager Large Array, Sub-millimeter Array, James ClerkMaxwell Telescope, and the Northern Extended Millimetre Array, combined withpublicly available infrared, optical, UV, and X-ray measurements. With thesedata, we report detailed diagnostics of the spectral and variability propertiesof the jet emission observed during different stages of this outburst. Thesediagnostics show that emission from discrete jet ejecta dominated the jetemission during the brightest stages of the outburst. We find that the ejectabecame fainter, slower, less frequent, and less energetic, before the emissiontransitioned (over 1--2 days) to being dominated by a compact jet, as theoutburst decayed toward quiescence. While the broad-band spectrum of thiscompact jet showed very little evolution throughout the outburst decay (withthe optically thick to thin synchrotron jet spectral break residing in thenear-infrared/optical bands; $\sim2-5\times10^{14}$ Hz), the emission stillremained intermittently variable at mm/sub-mm frequencies. Additionally, wepresent a comparison between the radio jet emission throughout the 2015 andprevious 1989 outbursts, confirming that the radio emission in the 2015outburst decayed significantly faster than in 1989. Lastly, we detail oursub-mm observations taken during the December 2015 mini-outburst of V404 Cygni,which demonstrate that, similar to the main outburst, the source was likelylaunching jet ejecta during this short period of renewed activity.

Tracking the variable jets of V404 Cygni during its 2015 outburst