The supernova of the MAGIC GRB190114C

TL;DR

This paper reports the first detection of a gamma-ray burst at TeV energies, studying its afterglow and associated supernova, revealing insights into the explosion's properties and potential high-energy neutrino emission.

Contribution

It provides the first detailed multi-wavelength observation of a TeV-detected GRB and its supernova, including modeling of afterglow and supernova characteristics, and discusses possible hadronic origins of TeV emission.

Findings

Afterglow modeled by forward shock in a uniform medium

Supernova luminosity between intermediate and luminous GRB-SNe

Spectral lines similar to less-luminous core-collapse supernovae

Abstract

We observed GRB190114C (redshift z = 0.4245), the first GRB ever detected at TeV energies, at optical and near-infrared wavelengths with several ground-based telescopes and the Hubble Space Telescope, with the primary goal of studying its underlying supernova, SN2019jrj. The monitoring spanned the time interval between 1.3 and 370 days after the burst, in the observer frame. We find that the afterglow emission can be modelled with a forward shock propagating in a uniform medium modified by time-variable extinction along the line of sight. A jet break could be present after 7 rest-frame days, and accordingly the maximum luminosity of the underlying SN ranges between that of stripped-envelope corecollapse supernovae (SNe) of intermediate luminosity, and that of the luminous GRB-associated SN2013dx. The observed spectral absorption lines of SN2019jrj are not as broad as in classical GRB-SNe, and are rather more similar to those of less-luminous core-collapse SNe. Taking the broad-lined stripped-envelope core-collapse SN2004aw as an analogue, we tentatively derive the basic physical properties of SN2019jrj. We discuss the possibility that a fraction of the TeV emission of this source might have had a hadronic origin and estimate the expected high-energy neutrino detection level with IceCube.