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We analyze the energetics of the major radio flare of October 8 2005 in GRS1915+105. The flare is of particular interest because it is one of the mostluminous and energetic radio flares from a Galactic black hole that has everbeen observed. The motivation is two-fold. One, to learn more about theenergetics of this most extreme phenomenon and its relationship to theaccretion state. The second is to verify if the calibrated estimates of theenergy of major radio flares (based on the peak low frequency optically thinflux) derived from flares in the period 1996-2001 in Punsly & Rodriguez (2013),PR13 hereafter, can be used to estimate plasmoid energy beyond this timeperiod. We find evidence that the calibrated curves are still accurate for thisstrong flare. Furthermore, the physically important findings of PR13 aresupported by the inclusion of this flare: the flare energy is correlated withboth the intrinsic bolometric X-ray luminosity, $L_{\mathrm{bol}}$, $\sim 1$hour before ejection and $L_{\mathrm{bol}}$ averaged over the duration of theejection of the plasmoid and $L_{\mathrm{bol}}$ is highly elevated relative tohistoric levels just before and during the ejection episode. A search of thedata archives reveal that only the October 8 2005 flare and those in PR13 haveadequate data sampling to allow estimates of both the energy of the flare andthe X-ray luminosity before and during flare launch.

Calibrated Estimates of the Energy in Major Flares of GRS 1915+105