Observations of Mkn~421 with the MAGIC Telescope

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  • 17 March 2006
Abstract
The blazar Mkn~421 was observed at GeV-TeV energies during moderately high flux states between November 2004 and April 2005 with the MAGIC telescope, shortly after the end of its commissioning phase. Here we present a combined analysis of data samples recorded under different observational conditions. The integrated flux level is found to vary by more than a factor 2 on different time-scales down to 1 hour. A clear correlation is observed between $\gamma$-rays and X-rays fluxes, as well as a weaker correlation between $\gamma$-rays and optical data. The energy spectrum between 100 GeV and 3 TeV shows a clear curvature. After correcting the measured spectrum for the effect of the gamma-gamma attenuation caused by the extragalactic background light (EBL) there is an indication of an inverse Compton peak around 100 GeV, independent of the flux level.

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