GRB 180728A and SN 2018fip: The nearest high-energy cosmological gamma-ray burst with an associated supernova

Key Points

The event GRB 180728A is one of the most energetic gamma-ray bursts observed at redshift z<0.2, indicating its unique properties.
The follow-up included photometric and spectroscopic observations of the afterglow and supernova for up to 80 days post-burst.
Asymmetries in the ejecta must be considered to better understand the relationship between gamma-ray bursts and supernovae, particularly in energy distribution.
The kinetic energy of SN 2018fip is below the typical range for associated supernovae, highlighting the varied characteristics within this phenomenon.

Abstract

The long gamma-ray burst GRB, 180728A at a redshift of z=0. 1171 stands out due to its high isotropic energy of E_ erg, in contrast with most events at redshift z20, -1), that is dominant early on and a more massive low-velocity component that dominates at much later epochs. Our findings indicate that asymmetries need to be considered in order to better understand GRB-SNe. In any case, SN, 2018fip shares many characteristics with typical GRB-SNe. Its kinetic energy is below the common range of 10⁵2--10⁵3 erg and does not correlate with the high energy of the GRB, highlighting the complexity and diversity of the GRB-SN energy budget partition.

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GRB 180728A and SN 2018fip: The nearest high-energy cosmological gamma-ray burst with an associated supernova

Key Points

Abstract

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