Jul 12 – 23, 2021
Europe/Berlin timezone

The problematic connection between low-luminosity gamma-ray bursts and ultra-high-energy cosmic rays

Jul 13, 2021, 12:00 PM
1h 30m


Talk CRI | Cosmic Ray Indirect Discussion


Filip Samuelsson (KTH Royal Institute of Technology)


Ultra-high-energy cosmic rays (UHECR) are the most energetic particles ever observed. What astrophysical sources are responsible for their immense acceleration remains unknown despite decades of research. In this talk, I will investigate whether low-luminosity gamma-ray bursts (llGRBs), short-lived cosmic explosions currently seen as one of the most promising acceleration candidates, can be the main sources of UHECR. Our study focuses on the radiation from the less energetic electrons, which are inevitably accelerated in the same region. This radiation can be characterized and compared to observations of llGRBs. We find that the radiation from these electrons would be much too luminous, showing that llGRBs would have to be orders of magnitude brighter if they hosted significant UHECR acceleration. This result challenges llGRBs as accelerators of UHECR.


Ultra-high-energy cosmic rays (UHECRs); low-luminosity gamma-ray bursts (llGRBs)

Subcategory Theoretical Results

Primary author

Filip Samuelsson (KTH Royal Institute of Technology)


Dr Damien Bégué (Bar-Ilan University) Prof. Felix Ryde (KTH Royal Institute of Technology) Prof. Asaf Pe'er (Bar-Ilan University) Kohta Murase (Pennsylvania State University)

Presentation materials