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|Title:||Four GRB supernovae at redshifts between 0.4 and 0.8. The bursts GRB 071112C, 111228A, 120714B, and 130831A||Authors:||Klose, S.
Kann, D. A.
Nicuesa Guelbenzu, A.
Olivares E., F.
Afonso, P. M. J.
Fynbo, J. P. U.
Updike, A. C.
|Issue Date:||2019||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||622||Abstract:||Twenty years ago, GRB 980425/SN 1998bw revealed that long gamma-ray bursts (GRBs) are physically associated with broad-lined type-Ic supernovae (SNe). Since then more than 1000 long GRBs have been localized to high angular precision, but only in ∼50 cases has the underlying SN component been identified. Using the Gamma-Ray Burst Optical Near-Infrared Detector (GROND) multi-channel imager at ESO/La Silla, during the last ten years we have devoted a substantial amount of observing time to reveal and study SN components in long-GRB afterglows. Here we report on four more GRB SNe (associated with GRBs 071112C, 111228A, 120714B, and 130831A) which were discovered and/or followed-up with GROND and whose redshifts lie between z = 0.4 and 0.8. We study their afterglow light curves, follow the associated SN bumps over several weeks, and characterize their host galaxies. Using SN 1998bw as a template, the derived SN explosion parameters are fully consistent with the corresponding properties of the currently known GRB-SN ensemble, with no evidence for an evolution of their properties as a function of redshift. In two cases (GRB 120714B/SN 2012eb at z = 0.398 and GRB 130831A/SN 2013fu at z = 0.479) additional Very Large Telescope (VLT) spectroscopy of the associated SNe revealed a photospheric expansion velocity at maximum light of about 40 000 and 20 000 km s^-1, respectively. For GRB 120714B, which was an intermediate-luminosity burst, we find additional evidence for a black-body component in the light of the optical transient at early times, similar to what has been detected in some GRB SNe at lower redshifts.||URI:||http://hdl.handle.net/20.500.12386/29300||URL:||https://www.aanda.org/articles/aa/full_html/2019/02/aa32728-18/aa32728-18.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201832728||Bibcode ADS:||2019A&A...622A.138K||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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