GRB 140606B/iPTF14bfu: Detection of shock-breakout emission from a cosmological γ -ray burst?

Zach Cano*, A. de Ugarte Postigo, D. Perley, T. Krühler, R. Margutti, M. Friis, D. Malesani, P. Jakobsson, J. P U Fynbo, J. Gorosabel, J. Hjorth, R. Sánchez-Ramírez, S. Schulze, N. R. Tanvir, C. C. Thöne, D. Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


We present optical and near-infrared photometry of GRB 140606B (z = 0.384), and optical photometry and spectroscopy of its associated supernova (SN). The results of our modelling indicate that the bolometric properties of the SN (MNi = 0.4 ± 0.2 M·, Mej = 5 ± 2 M·, and EK = 2 ± 1 × 1052 erg) are fully consistent with the statistical averages determined for other γ -ray burst (GRB)-SNe. However, in terms of its γ -ray emission, GRB 140606B is an outlier of the Amati relation, and occupies the same region as low luminosity (ll) and short GRBs. The γ -ray emission in llGRBs is thought to arise in some or all events from a shock breakout (SBO), rather than from a jet. The measured peak photon energy (Ep ≈ 800 keV) is close to that expected for γ -rays created by an SBO (≳ 1 MeV). Moreover, based on its position in theMV ,p-Liso,γ plane and the EK-Γβ plane, GRB 140606B has properties similar to both SBO-GRBs and jetted-GRBs. Additionally, we searched for correlations between the isotropic γ -ray emission and the bolometric properties of a sample of GRB-SNe, finding that no statistically significant correlation is present. The average kinetic energy of the sample is ĒK = 2.1 × 1052 erg. All of the GRB-SNe in our sample, with the exception of SN 2006aj, are within this range, which has implications for the total energy budget available to power both the relativistic and non-relativistic components in a GRB-SN event.

Original languageEnglish (US)
Pages (from-to)1535-1552
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Feb 11 2015


  • Gamma-ray burst: general
  • Gamma-ray burst: individual: GRB 140606B
  • Gamma-ray burst: individual: iPTF14bfu
  • Supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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