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Using the High Energy Spectroscopic System (H.E.S.S.) telescopes we havediscovered a steady and extended very high-energy (VHE) gamma-ray sourcetowards the luminous blue variable candidate LBV1806-20, massive stellarcluster Cl*1806-20, and magnetar SGR1806-20. The new VHE source, HESSJ1808-204,was detected at a statistical significance of >6sigma (post-trial) with aphoton flux normalisation $(2.9 \pm 0.4_{\rm stat} \pm 0.5_{\rm sys})\times10^{-13}$\,ph\,cm$^{-2}$\,s$^{-1}$\,TeV$^{-1}$ at 1TeV and a power-law photonindex of $2.3\pm0.2_{\rm stat}\pm 0.3_{\rm sys}$. The luminosity of this source(0.2 to 10 TeV; scaled to distance d=8.7kpc) is $L_{\rm VHE}\sim1.6 \times10^{34}(d/{8.7kpc})^2$\,erg\,s$^{-1}$. The VHE gamma-ray emission is extendedand is well fit by a single Gaussian with statistical standard deviation of$0.095^\circ \pm 0.015^\circ$. This extension is similar to that of thesynchrotron radio nebula G10.0-0.3, which is thought to be powered byLBV1806-20. The VHE gamma-ray luminosity could be provided by the stellar windluminosity of LBV1806-20 by itself and/or the massive star members ofCl*1806-20. Alternatively, magnetic dissipation (e.g. via reconnection) fromSGR1806-20 can potentially account for the VHE luminosity. The origin andhadronic and/or leptonic nature of the accelerated particles responsible forHESSJ1808-204 is not yet clear. If associated with SGR1806-20, the potentiallyyoung age of the magnetar (650yr) can be used to infer the transport limits ofthese particles to match the VHE source size. This discovery provides newinterest in the potential for high-energy particle acceleration from magnetars,massive stars, and/or stellar clusters.

Extended VHE gamma-ray emission towards SGR1806-20, LBV1806-20, and stellar cluster Cl*1806-20