Details

Autor(en) / Beteiligte

• Klose, S.
• Schmidl, S.
• Kann, D. A.
• Nicuesa Guelbenzu, A.
• Schulze, S.
• Greiner, J.
• Olivares E., F.
• Krühler, T.
• Schady, P.
• Afonso, P. M. J.
• Filgas, R.
• Fynbo, J. P. U.
• Rau, A.
• Rossi, A.
• Takats, K.
• Tanga, M.
• Updike, A. C.
• Varela, K.

Titel

Four GRB supernovae at redshifts between 0.4 and 0.8

Ist Teil von

• Astronomy and astrophysics (Berlin), 2019-02, Vol.622

Ort / Verlag

Heidelberg: EDP Sciences

Erscheinungsjahr

2019

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• 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.