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.
Original language | English |
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Article number | A138 |
Number of pages | 28 |
Journal | Astronomy & Astrophysics |
Volume | 622 |
Early online date | 11 Feb 2019 |
DOIs | |
Publication status | Published - 28 Feb 2019 |
Keywords
- Gamma-ray burst: individual: GRB 071112C
- Gamma-ray burst: individual: GRB 111228A
- Gamma-ray burst: individual: GRB 120714B
- Gamma-ray burst: individual: GRB 130831A
- Supernovae: individual: SN 2012eb
- Supernovae: individual: SN 2013fu
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science