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We present very high energy (VHE, E > 100 GeV) {\gamma}-ray observations ofthe {\gamma}-ray binary system LS I+61 303 obtained with the MAGIC stereosystem between 2009 October and 2010 January. We detect a 6.3{\sigma}{\gamma}-ray signal above 400 GeV in the combined data set. The integral fluxabove an energy of 300 GeV is F(E>300 GeV)=(1.4 +- 0.3stat +- 0.4syst) *10^{-12} cm^{-2} s^{-1}, which corresponds to about 1.3% of the Crab Nebulaflux in the same energy range. The orbit-averaged flux of LS I +61 303 in theorbital phase interval 0.6--0.7, where a maximum of the TeV flux is expected,is lower by almost an order of magnitude compared to our previous measurementsbetween 2005 September and 2008 January. This provides evidence for a new lowemission state in LS I +61 303. We find that the change to the low flux statecannot be solely explained by an increase of photon-photon absorption aroundthe compact star.

Detection of the gamma-ray binary LS I +61 303 in a low flux state at Very High Energy gamma-rays with the MAGIC Telescopes in 2009