{"paper":{"title":"Variable gamma-ray emission from the Crab Nebula: short flares and long \"waves\"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Argan, A. Bulgarelli, A. Ferrari, A. Giuliani, A. Pellizzoni, A. Trois, C. Pittori, E. Costa, E. Del Monte, E. Striani, F. Verrecchia, G. Piano, G. Pucella, I. Donnarumma, L. Pacciani, M. Cardillo, M. Rapisarda, M. Tavani, M. Trifoglio, P. Soffitta, S. Colafrancesco, S. Mereghetti, S. Sabatini, S. Vercellone, V. Vittorini","submitted_at":"2013-02-18T16:40:00Z","abstract_excerpt":"Gamma-ray emission from the Crab Nebula has been recently shown to be unsteady. In this paper, we study the flux and spectral variability of the Crab above 100 MeV on different timescales ranging from days to weeks. In addition to the four main intense and day-long flares detected by AGILE and Fermi-LAT between Sept. 2007 and Sept. 2012, we find evidence for week-long and less intense episodes of enhanced gamma-ray emission that we call \"waves\". Statistically significant \"waves\" show timescales of 1-2 weeks, and can occur by themselves or in association with shorter flares. We present a refine"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.4342","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":""},"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"}