{"paper":{"title":"Hour-Scale Multiwavelength Variability in Markarian 421","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A.C. Breslin, A. Celotti, A.M. Burdett, A.M. Hillas, A. Treves, C. Masterson, D.A. Carter-Lewis, D. Horan, D.J. Fegan, E. Pian, F. Krennrich, F. Tavecchio, F.W. Samuelson, G. Fossati, G. Ghisellini, G.H. Sembroski, G. Tagliaferri, H.J. Rose, I.H. Bond, J.A. Gaidos, J.H. Buckley, J. Knapp, J.P. Finley, J. Quinn, L. Chiappetti, L. Maraschi, M. Catanese, M. D'Vali, M.F. Cawley, P. Grandi, P. Moriarty, R.W. Lessard, S. Dunlea, S.J. Fegan, S. Le Bohec, S.M. Bradbury, T.A. Hall, T.C. Weekes, V.V. Vassiliev","submitted_at":"1999-06-11T21:15:15Z","abstract_excerpt":"Markarian 421 was observed for about four days with BeppoSAX and the Whipple Observatory gamma-ray telescope in April 1998. A pronounced, well-defined, flare with hour-scale variability was observed simultaneously in X-rays and very high energy gamma-rays. These data provide the first evidence that the X-ray and TeV intensities are well correlated on time-scales of hours. While the rise of the flare occurred on a similar time-scale in the two wavebands, the decay of the flare was much more rapid in gamma rays, providing the first clear indication that the X-ray and gamma-ray emission may not b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9906209","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/9906209/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}