{"paper":{"title":"A Trio of GRB-SNe: GRB 120729A, GRB 130215A / SN 2013ez and GRB 130831A / SN 2013fu","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. de Ugarte Postigo, A. Gomboc, A. Johansson, A. Kutyrev, A. Levan, A. Matkin, A. Melandri, A. M. Watson, A. Pozanenko, A. Volnova, C. C. Thone, C. Farina, C. G. Roman-Zuniga, C. Guidorzi, C. Mundell, C. W. Akerlof, D. A. Kann, D. Kopac, D. Malesani, D. Xu, E. Cooke, E. Klunko, F. Knust, F. V. Ferrante, F. Yuan, G. Dhungana, G. Leloudas, H. A. Flewelling, I. Molotov, I. Steele, J. A. de Diego, J. Bloom, J. Fynbo, J. Gorosabel, J. Greiner, J. Hjorth, J. J. Gonzalez, J. Xavier Prochaska, K. Varela, K. Wiersema, L. Georgiev, M. G. Richer, M Jelinek, N. Butler, N. Gehrels, N. Hatch, N. Minikulov, N. R. Tanvir, O. Burkhonov, O. D. Fox, O. Hartoog, P. D'Avanzo, P. Jakobsson, R. Kehoe, R. Sanchez-Ramirez, S. Klose, S. Schulze, T. Guver, T. Kruhler, V. Linkov, V. Rumyantsev, W. H. Lee, W. Zheng, Y. Krugl, Z. Cano","submitted_at":"2014-05-13T11:41:51Z","abstract_excerpt":"We present optical and near-infrared (NIR) photometry for three gamma-ray burst supernovae (GRB-SNe): GRB 120729A, GRB 130215A / SN 2013ez and GRB 130831A / SN 2013fu. In the case of GRB 130215A / SN 2013ez, we also present optical spectroscopy at t-t0=16.1 d, which covers rest-frame 3000-6250 Angstroms. Based on Fe II (5169) and Si (II) (6355), our spectrum indicates an unusually low expansion velocity of 4000-6350 km/s, the lowest ever measured for a GRB-SN. Additionally, we determined the brightness and shape of each accompanying SN relative to a template supernova (SN 1998bw), which were u"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.3114","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"}