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Research, (23) Universitat de Barcelona (ICC/IEEC), (24) Universit\\`a di Pisa, 25), (25) now at Ecole polytechnique f\\'ed\\'erale de Lausanne (EPFL), 26), (26) now at Department of Physics \\& Astronomy, 27), (27) now at Finnish Centre for Astronomy with ESO (FINCA), 28), (28) also at INAF-Trieste, 29), (29) also at Instituto de Fisica Teorica, (2) Universit\\`a di Udine, 30), (30) now at Stockholm University, 31), (31) now at GRAPPA Institute, 32, (32) now at Stockholm University, (33) Physics Department, 34), (34) DESY, (35) Department of Physics, (36) Fred Lawrence Whipple Observatory, (37) School of Physics, 38), (38) Institute of Physics, (39) Astronomy Department, (3) INAF National Institute for Astrophysics, 40129 Bologna, (40) Department of Physics, (41) School of Physics, (42) Department of Physics, (43) Department of Astronomy, (44) Santa Cruz Institute for Particle Physics, (45) Department of Physics, (46) Department of Physics, (47) Physics Department, (48) Department of Physics, (49) Department of Physics, (4) Universit\\`a di Siena, 50), (50) School of Physics, 5-10-1 Fuchinobe, (51) Enrico Fermi Institute, 525 Davey Lab, 525 Northwestern Ave, (52) School of Physics, 53121 Bonn, (53) Department of Life, (54) Department of Physics, (55) Department of Physics, (56) Instituto de Astronomia y Fisica del Espacio, (57) Department of Applied Physics, (58) Argonne National Laboratory, (59) Harvard-Smithsonian Center for Astrophysics, (5) Croatian MAGIC Consortium, (60) INAF, (61) Department of Astronomy, (62) Graduate Institute of Astronomy, (63) School of Cosmic Physics, 64), (64) Moscow M.V. Lomonosov State University, (65) Abastumani Observatory, 66), (66) Landessternwarte, (67) Aalto University Mets\\\"ahovi Radio Observatory Mets\\\"ahovintie 114 FIN-02540 Kylm\\\"al\\\"a Finland, 68), (68) Aalto University Department of Radio Science, 69117 Heidelberg, (69) University College Dublin, (6) Max-Planck-Institut f\\\"ur Physik, (70) Isaac Newton Institute of Chile, 71, (71) Pulkovo Observatory, 72), (72) Astronomical Institute, (73) Max-Planck-Institut f\\\"ur Radioastronomie, (74) Agenzia Spaziale Italiana (ASI) Science Data Center, (75) Instituto Nacional de Astrof\\'isica, (76) INAF Istituto di Radioastronomia, (77) Department of Physics, (78) Cahill Center for Astronomy, (79) Astro Space Center of the Lebedev Physical Institute, (7) Universidad Complutense, 80), (80) Center for Research, (81) Indiana University, (82) National Radio Astronomy Observatory, 837 State Street NW, (83) Department of Physics, (84) INAF Istituto di Radioastronomia, (85) Department of Physics, 86), (86) ASI-Science Data Center, (87) Department of Physics, (88) Department of Physics, (89) Department of Physics, (8) Inst. de Astrof\\'isica de Canarias, (90) Department of Physics, (91) INAF Istituto di Radioastronomia, 952 Engineering, 96017 Noto (SR), 9700 S. 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Yatsu (85), Zentrum f\\\"ur Astronomie der Universit\\\"at Heidelberg","submitted_at":"2015-02-09T20:54:29Z","abstract_excerpt":"We performed a 4.5-month multi-instrument campaign (from radio to VHE gamma rays) on Mrk421 between January 2009 and June 2009, which included VLBA, F-GAMMA, GASP-WEBT, Swift, RXTE, Fermi-LAT, MAGIC, and Whipple, among other instruments and collaborations. Mrk421 was found in its typical (non-flaring) activity state, with a VHE flux of about half that of the Crab Nebula, yet the light curves show significant variability at all wavelengths, the highest variability being in the X-rays. We determined the power spectral densities (PSD) at most wavelengths and found that all PSDs can be described b"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1502.02650","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-02-09T20:54:29Z","cross_cats_sorted":[],"title_canon_sha256":"dba1767922b4e2dd01e3ce4e560650b2a7ed54cda0831a5901ffe0bb0547c87c","abstract_canon_sha256":"3b078321feed90b60f798aa79f8e1857b4c69c69f87e388ffa705ba12d3ecefe"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:09:50.779288Z","signature_b64":"FWDt22oMqYEhOI2oN3AMw5sz3sYpwHzPilnjrUAa3edoFA7O8p1peqC51doVHD57OvfmsAUeVwsHRmotixmbDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7096faaef33aee80be38b97b48167723b928f9b2c8bdfb5c932531080394cf59","last_reissued_at":"2026-05-18T01:09:50.778665Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:09:50.778665Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The 2009 multiwavelength campaign on Mrk 421: Variability and correlation studies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"*), 0301 Abastumani, 1098XH Amsterdam, (10) Deutsches Elektronen-Synchrotron (DESY), 117997 Moscow, (11) ETH Zurich, 1200 E California Blvd, (12) Universit\\\"at W\\\"urzburg, (13) Centro de Investigaciones Energ\\'eticas, 14476 Potsdam-Golm, (14) Technische Universit\\\"at Dortmund, 15738 Zeuthen, (15) Inst. de Astrof\\'isica de Andaluc\\'ia (CSIC), (16) Universit\\`a di Padova, (17) Universit\\`a dell'Insubria, (18) Unitat de F\\'isica de les Radiacions, 196140 St. Petersburg, (19) Institut de Ci\\`encies de l'Espai (IEEC-CSIC), 2, (20) Finnish MAGIC Consortium, (21) Japanese MAGIC Consortium, (22) Inst. for Nucl. Research, (23) Universitat de Barcelona (ICC/IEEC), (24) Universit\\`a di Pisa, 25), (25) now at Ecole polytechnique f\\'ed\\'erale de Lausanne (EPFL), 26), (26) now at Department of Physics \\& Astronomy, 27), (27) now at Finnish Centre for Astronomy with ESO (FINCA), 28), (28) also at INAF-Trieste, 29), (29) also at Instituto de Fisica Teorica, (2) Universit\\`a di Udine, 30), (30) now at Stockholm University, 31), (31) now at GRAPPA Institute, 32, (32) now at Stockholm University, (33) Physics Department, 34), (34) DESY, (35) Department of Physics, (36) Fred Lawrence Whipple Observatory, (37) School of Physics, 38), (38) Institute of Physics, (39) Astronomy Department, (3) INAF National Institute for Astrophysics, 40129 Bologna, (40) Department of Physics, (41) School of Physics, (42) Department of Physics, (43) Department of Astronomy, (44) Santa Cruz Institute for Particle Physics, (45) Department of Physics, (46) Department of Physics, (47) Physics Department, (48) Department of Physics, (49) Department of Physics, (4) Universit\\`a di Siena, 50), (50) School of Physics, 5-10-1 Fuchinobe, (51) Enrico Fermi Institute, 525 Davey Lab, 525 Northwestern Ave, (52) School of Physics, 53121 Bonn, (53) Department of Life, (54) Department of Physics, (55) Department of Physics, (56) Instituto de Astronomia y Fisica del Espacio, (57) Department of Applied Physics, (58) Argonne National Laboratory, (59) Harvard-Smithsonian Center for Astrophysics, (5) Croatian MAGIC Consortium, (60) INAF, (61) Department of Astronomy, (62) Graduate Institute of Astronomy, (63) School of Cosmic Physics, 64), (64) Moscow M.V. Lomonosov State University, (65) Abastumani Observatory, 66), (66) Landessternwarte, (67) Aalto University Mets\\\"ahovi Radio Observatory Mets\\\"ahovintie 114 FIN-02540 Kylm\\\"al\\\"a Finland, 68), (68) Aalto University Department of Radio Science, 69117 Heidelberg, (69) University College Dublin, (6) Max-Planck-Institut f\\\"ur Physik, (70) Isaac Newton Institute of Chile, 71, (71) Pulkovo Observatory, 72), (72) Astronomical Institute, (73) Max-Planck-Institut f\\\"ur Radioastronomie, (74) Agenzia Spaziale Italiana (ASI) Science Data Center, (75) Instituto Nacional de Astrof\\'isica, (76) INAF Istituto di Radioastronomia, (77) Department of Physics, (78) Cahill Center for Astronomy, (79) Astro Space Center of the Lebedev Physical Institute, (7) Universidad Complutense, 80), (80) Center for Research, (81) Indiana University, (82) National Radio Astronomy Observatory, 837 State Street NW, (83) Department of Physics, (84) INAF Istituto di Radioastronomia, (85) Department of Physics, 86), (86) ASI-Science Data Center, (87) Department of Physics, (88) Department of Physics, (89) Department of Physics, (8) Inst. de Astrof\\'isica de Canarias, (90) Department of Physics, (91) INAF Istituto di Radioastronomia, 952 Engineering, 96017 Noto (SR), 9700 S. 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Menzel (6), Universitat Aut\\`onoma de Barcelona, University College Dublin, University of Amsterdam, University of California, University of Chicago, University of Colorado, University of Delaware, University of Iowa, University of Michigan, University of Minnesota, University of Oulu, University of Potsdam, University of Rijeka, University of Split, University of Trento, University of Turku, University of Utah, University Park, University Road, USA, UT 84112, Utah 84602, Van Allen Hall, V. Bugaev (35), VERITAS collaboration: S. Archambault (33), Via del Politecnico, V. Kadenius (20), V. M. Larionov (70, V. Scalzotto (16), V. Scapin (7), V. Stamatescu (1), Washington University, W. Bednarek (9), W. Benbow (36), W. Cui (40), West Lafayette, W. Idec (9), W. Max-Moerbeck (78), W. P. Chen (62), W. Rhode (14), X. Chen (38, X. Paredes-Fortuny (23), Y. Khassen (37), Y. Mori (85), Y. Yatsu (85), Zentrum f\\\"ur Astronomie der Universit\\\"at Heidelberg","submitted_at":"2015-02-09T20:54:29Z","abstract_excerpt":"We performed a 4.5-month multi-instrument campaign (from radio to VHE gamma rays) on Mrk421 between January 2009 and June 2009, which included VLBA, F-GAMMA, GASP-WEBT, Swift, RXTE, Fermi-LAT, MAGIC, and Whipple, among other instruments and collaborations. Mrk421 was found in its typical (non-flaring) activity state, with a VHE flux of about half that of the Crab Nebula, yet the light curves show significant variability at all wavelengths, the highest variability being in the X-rays. 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