{"paper":{"title":"Supernova 2006aj and the associated X-Ray Flash 060218","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"2), A. O. Jaunsen (3), B. L. Jensen, C. C. Th\\\"one, C. Feron, Denmark (2) Stockholm Observatory, D. Watson, D. Xu, G. \\\"Ostlin ((1) Dark Cosmology Centre, H. E. Schwarz, I. Ilyin, J.-E. Ovaldsen, J. Gorosabel, J. Hjorth (1), J. N\\\"ar\\\"anen, J. P. U. Fynbo (1), J. Selj, J. Sollerman (1, M. Stritzinger (1), M. Wold, Niels Bohr Institute, N. Lysfjord, Norway), Oslo, P. Jakobsson (1), P. Laursen, R. Duro, S. Walch, Sweden (3) Institute of theoretical astrophysics, T. B. Nielsen, T. Davis, T. Marquart, University of Copenhagen","submitted_at":"2006-03-20T13:46:38Z","abstract_excerpt":"We have studied the afterglow of the gamma-ray burst (GRB) of February 18, 2006. This is a nearby long GRB, with a very low peak energy, and is therefore classified as an X-ray Flash (XRF). XRF 060218 is clearly associated with a supernova -- dubbed SN 2006aj. We present early spectra for SN 2006aj as well as optical lightcurves reaching out to 50 days past explosion. Our optical lightcurves define the rise times, the lightcurve shapes and the absolute magnitudes in the U, V and R bands, and we compare these data with data for other relevant supernovae. SN 2006aj evolved quite fast, somewhat s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0603495","kind":"arxiv","version":2},"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/0603495/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"}