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Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system
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Since its commissioning in fall 1996, the stereoscopic system of Imaging Atmospheric Cherenkov Telescope (IACTs) of HEGRA with an energy threshold of 500 GeV, an angular resolution of 0.1 degree and an energy resolution of 20% per individual photon, and an energy flux sensitivity nu F_nu at 1 TeV of 1E-11erg/cm**2 s (S/N = 5 sigma) for one hour of observation time has been used to monitor the BL Lac object Mkn 421 on a regular basis. In this letter, we report detailed temporal and spectral information about the TeV characteristics of Mkn 421 in 1997 and 1998. We study the light curve, the shortest time scales of flux variability, the differential spectra on diurnal basis for several days with good gamma-ray statistics and the time averaged energy spectrum. Special emphasis will be put on presenting the data taken during the world-wide April 1997 multiwavelength campaign. We compare the Mkn 421 results with the results obtained for the BL Lac object Mkn 501 and discuss possible implications for the emission mechanism and the Diffuse Intergalactic Background Radiation.
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On the correlation between X-rays and TeV gamma-rays in HBL Blazars
Long-term X-ray and TeV gamma-ray fluxes are linearly correlated in most HBL blazars, with steeper indices for Mrk 501 and the 2006 PKS 2155-304 flare.
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