J/A+A/410/813ivo://CDS.VizieR/J/A+A/410/813doi:10.26093/cds/vizier.34100813CDSAharonian F.A.Akhperjanian A.G.Beilicke M.Bernloehr K.Boerst H.-G.,Bojahr H.Bolz O.Coarasa J.A.Contreras J.L.Cortina J.,Denninghoff S.Fonseca M.V.Girma M.Goebel F.Goetting N.,Heinzelmann G.Hermann G.Heusler A.Hofmann W.Horns D.Jung I.,Kankanyan R.Kestel M.Kettler J.Kohnle A.Konopelko A.Kranich D.,Krawczynski H.Lampeitl H.Lopez M.Lorenz E.Lucarelli F.Mang O.,Meyer H.Mirzoyan R.Moralejo A.Ona-Wilhelmi E.Paneque D.,Panter M.Plyasheshnikov A.Puehlhofer G.de los Reyes R.Rhode W.,Ripken J.Rowell G.P.Sahakian V.Samorski M.Schilling M.,Schweizer T.Sevilla I.Siems M.Sobczynska D.Stamm W.Tluczykont M.,Tonello N.Vitale V.Voelk H.J.Wagner R.M.Wiedner C.A.,W.Wittek.2003-12-28T22:02:41Z2003-12-28T23:01:54ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fractive-galactic-nucleibl-lacertae-objectsgamma-ray-astronomyIn the first months of 2001 the AGN Mkn 421 showed highly variable, strong TeV activity at flux levels frequently exceeding 1 Crab. Here we present the light curve and energy spectrum of Mkn 421 as measured with the HEGRA stand alone telescope CT1. Around 30% of the data were taken under moonlight conditions. The spectrum shows a significant exponential energy cutoff at around 3.4 TeV. The results from the dark night- and the moon data are in excellent agreement with each other. A significant spectral shape variation depending on the flux level has been found. The TeV light curve is also found to be highly correlated with the X-ray light curve of the RXTE/ASM satellite, showing no significant time lag larger than 0.2d. The derived correlation coefficient of 0.83 corresponds to a 5.2{sigma} significance.2003A&A...410..813Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/410/813CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/410/813https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/410/813http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/410/813https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/410/813https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/410/813http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/410/813GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapGamma-raydefaultJ/A+A/410/813/table4Integral flux values of Mkn 421recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Date (MJD=JD-2400000.5)time.epochdoubleFluxIntegral Flux above 1 TeV (1)1e-11cm**-2.s**-1phot.flux.density;em.gamma.softfloate_Fluxerror on the Integral Flux (1)1e-11cm**-2.s**-1stat.errorfloatExpTimeobservation timehtime.duration;obs.exposurefloatHVHV setting of the PMTs (2)instr.setupchar