{"paper":{"title":"Fermi/GBM observations of the ultra-long GRB 091024: A burst with an optical flash","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"A. Goldstein, A. J. van der Horst, A. Rau, A. von Kienlin, C. A. Meegan, C. Kouveliotou, C. Wilson-Hodge, D. Burlon, D.Gruber, D. Tierney, E. Bissaldi, G. J. Fishman, J. Greiner, J. M. Burgess, L. Lin, M. H. Gibby, M. M. Giles, M. Nardini, M. S. Briggs, P. N. Bhat, R. Diehl, R. D. Preece, R. M. Kippen, S. Foley, S. Guiriec, S. McBreen, T. Kr\\\"uhler, V. Connaughton, V. L. Chaplin, W. S. Paciesas","submitted_at":"2011-01-05T21:19:48Z","abstract_excerpt":"In this paper we examine gamma-ray and optical data of GRB 091024, a gamma-ray burst (GRB) with an extremely long duration of T90~1020 s, as observed with the Fermi Gamma-Ray Burst Monitor (GBM). We present spectral analysis of all three distinct emission episodes using data from Fermi/GBM. Because of the long nature of this event, many ground-based optical telescopes slewed to its location within a few minutes and thus were able to observe the GRB during its active period. We compare the optical and gamma-ray light curves. Furthermore, we estimate a lower limit on the bulk Lorentz factor from"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.1099","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"}