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Fig. 8

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Integral flux above 200 GeV of the first flare observed from PKS 2155-304 on MJD 53 944 versus time measured by H.E.S.S. (gray points) and by MAGIC (red points). The MAGIC points are obtained using the integral flux above 400 GeV and extrapolated down to 200 GeV using the derived photon spectral index of  − 3.5. Instead, assuming the spectral index of  − 2.7 below 400 GeV as found by H.E.S.S., the MAGIC points would be 24% lower in flux. The horizontal line represents the observed flux of the Crab Nebula (Aharonian et al. 2006).

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