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We report the results of a multi-wavelength campaign on the blazar Mrk 421during outburst. We observed four strong flares at X-ray energies that were notseen at other wavelengths (partially because of missing data). From the fastestrise in the X-rays, an upper limit could be derived on the extension of theemission region. A time lag between high-energy and low-energy X-rays wasobserved, which allowed an estimation of the magnetic-field strength. Thespectral analysis of the X-rays revealed a slight spectral hardening of thelow-energy (3 - 43 keV) spectral index. The hardness-ratio analysis of theSwift-XRT (0.2 - 10 keV) data indicated a small correlation with the intensity;i. e., a hard-to-soft evolution was observed. At the energies of IBIS/ISGRI (20- 150 keV), such correlations are less obvious. A multiwavelength spectrum wascomposed and the X-ray and bolometric luminosities are calculated.

INTEGRAL observations of the blazar Mrk 421 in outburst (Results of a multi-wavelength campaign)