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Abe, M. Carretero-Castrillo, M. Delfino, M. Doro, M. Gaug, M. L\\'ainez, M. L\\'opez-Moya, M. Makariev, M. Mallamaci, M. Manganaro, M. Mariotti, M. Mart\\'inez, M. Molero Gonz\\'alez, M. Nievas Rosillo, M. Peresano, M. Perri, M. Persic, M. Pihet, M. Rib\\'o, M. Takahashi, M. Teshima, M. Vazquez Acosta, M. Vorbrugg, N. Giglietto, N. Sahakyan, O. Blanch, P. Da Vela, P. Gliwny, P. G. Prada Moroni, P. G\\\"unther, P. K. H. Yeung, P. Majumdar, P. Maru\\v{s}evec, P. M. Kouch, P. Temnikov, R. Carosi, R. de Menezes, R. Di Tria, R. Grau, R. L\\'opez-Coto, R. Mirzoyan, R. Paoletti, R. Takeishi, R. Walter, S. Abe, S. Covino, S. Garc\\'ia Soto, S. Gasparyan, S. Kankkunen, S. Lombardi, S. Loporchio, S. Mangano, S. Menchiari, S. Menon, S. Nozaki, S. Paiano, S. Ubach, S. Ventura, T. Aniello, T. Gradetzke, T. Hassan, T. Kayanoki, T. Terzi\\'c, T. T. H. Arnesen, U. Barres de Almeida, V. A. Acciari, V. Neustroev, V. Sliusar, V. Vitale, \\v{Z}. Bo\\v{s}njak, W. Bednarek, W. Rhode, Y. Chai, Y. Fukazawa, Y. Suda","cross_cats":["astro-ph.GA"],"headline":"Spectral variability in Mrk 421's January 2010 flare aligns with stochastic acceleration of particles.","license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-04-22T12:09:40Z","title":"The January 2010 flare of Mrk421: Insights from a stochastic acceleration model"},"references":{"count":63,"internal_anchors":4,"resolved_work":63,"sample":[{"cited_arxiv_id":"","doi":"10.1103/revmodphys.42.237","is_internal_anchor":false,"ref_index":1,"title":"Reviews of Modern Physics , year = 1970, month = jan, volume =","work_id":"fce58532-f565-445c-93f5-ba25152d93b4","year":1970},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":2,"title":"A new pile-up mechanism for relativistic electronspectra","work_id":"14fca253-8b0f-4549-bb11-e69541015339","year":null},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":3,"title":"A viable mechanism to establish relativistic thermal particle distribution functions in cosmic sources. , keywords =","work_id":"232f0170-f37a-4cfb-b1f0-98e9430f8711","year":null},{"cited_arxiv_id":"","doi":"10.1086/167009","is_internal_anchor":false,"ref_index":4,"title":"Cosmic-Ray Transport and Acceleration. 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Derivation of the Kinetic Equation and Application to Cosmic Rays in Static Cold Media. , keywords =. doi:10.1086/167009 , adsurl =","work_id":"5583924d-f42b-4142-804b-3c97a490a268","year":null},{"cited_arxiv_id":"astro-ph/9710327","doi":"10.1086/305772","is_internal_anchor":true,"ref_index":5,"title":"Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds","work_id":"efd54259-29c0-4968-8b05-742aa67252e7","year":null}],"snapshot_sha256":"f2ced302d84ad55dbfa78bf652e1a324d005ac03e7f5bb518b5163ca295c380e"},"source":{"id":"2604.20480","kind":"arxiv","version":1},"verdict":{"created_at":"2026-05-09T23:39:40.809463Z","id":"26c2a867-492a-4bae-af07-e111d17c3236","model_set":{"reader":"grok-4.3"},"one_line_summary":"The January 2010 flare of Mrk421 shows spectral variability consistent with stochastic acceleration, including development of a Maxwellian pile-up component in the particle distribution on three nights.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"Spectral variability in Mrk 421's January 2010 flare aligns with stochastic acceleration of particles.","strongest_claim":"We find the spectral variability to be well in agreement with stochastic acceleration. 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