English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Long-duration gamma-ray bursts (GRBs) originate from ultra-relativistic jetslaunched from the collapsing cores of dying massive stars. They arecharacterised by an initial phase of bright and highly variable radiation inthe keV-MeV band that is likely produced within the jet and lasts frommilliseconds to minutes, known as the prompt emission. Subsequently, theinteraction of the jet with the external medium generates external shock waves,responsible for the afterglow emission, which lasts from days to months, andoccurs over a broad energy range, from the radio to the GeV bands. Theafterglow emission is generally well explained as synchrotron radiation byelectrons accelerated at the external shock. Recently, an intense, long-lastingemission between 0.2 and 1 TeV was observed from the GRB 190114C. Here wepresent the results of our multi-frequency observational campaign ofGRB~190114C, and study the evolution in time of the GRB emission across 17orders of magnitude in energy, from $5\times10^{-6}$ up to $10^{12}$\,eV. Wefind that the broadband spectral energy distribution is double-peaked, with theTeV emission constituting a distinct spectral component that has powercomparable to the synchrotron component. This component is associated with theafterglow, and is satisfactorily explained by inverse Compton upscattering ofsynchrotron photons by high-energy electrons. We find that the conditionsrequired to account for the observed TeV component are not atypical, supportingthe possibility that inverse Compton emission is commonly produced in GRBs.

Observation of inverse Compton emission from a long $\gamma$-ray burst