Correlated variability of Mkn 421 at X-ray and TeV wavelengths on timescales of hours

L. Maraschi , G. Fossati , F. Tavecchio , L.Chiappetti , A. Celotti , G. Ghisellini , P. Grandi , E. Pian

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G. Tagliaferri A. Treves A.C.Breslin J.H.Buckley D.A.Carter-Lewis M.Catanese M.F.Cawley D.J.Fegan S.Fegan J.Finley J.Gaidos T.Hall A.M.Hillas F.Krennrich R.W. Lessard C.Masterson P.Moriarty J.Quinn J.Rose F.Samuelson T.C.Weekes

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classification 🌌 astro-ph

keywords observedcorrelatedhourswellx-rayaprilascabepposax

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Mkn 421 was observed for about two days with BeppoSAX, prior to and partly overlapping the start of a 1 week continuous exposure with ASCA in April 1998, as part of a world-wide multiwavelength campaign. A pronounced, well defined, flare observed in X-rays was also observed simultaneously at TeV energies by the Whipple Observatory's 10 m gamma-ray telescope. These data provide the first evidence that the X-ray and TeV intensities are well correlated on time-scales of hours.

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Correlated variability of Mkn 421 at X-ray and TeV wavelengths on timescales of hours

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