H.E.S.S. observations of SN 2024ggi

Supernova (SN) explosions interacting with dense circumstellar medium are considered to be very promising sites for efficient cosmic-ray (CR) acceleration and subsequent emission of neutral- pion-decay gamma rays. These environments share similarities with already detected gamma-ray novae, but with much greater available energy content, so it is important to characterize their emission in the very-high-energy range. We present the results of H.E.S.S. observations of one such candidate source – SN 2024ggi, located in NGC 3621 at a distance of 7.24 Mpc. A total of 30 hours of data, gathered throughout a month of post-explosion observations, provide flux upper limits that are used to constrain source parameters, offering meaningful insights for theoretical predictions. We exclude bright gamma-ray emission in the first day after explosion, and later upper limits are consistent with wind densities derived from optical observations.

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Published
2025-09-23
DOI
https://doi.org/10.22323/1.501.0576
Primary Topic
Gamma-ray bursts and supernovae
Type
article
Field-Weighted Citation Impact
0.00

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article

H.E.S.S. observations of SN 2024ggi

F. Schüßler, Jonathan Mackey, Robert Brose, Robert Daniel Parsons et al.
Gamma-ray bursts and supernovae
article

H.E.S.S. observations of SN 2024ggi

F. Schüßler, Jonathan Mackey, Robert Brose, Robert Daniel Parsons, Jowita Borowska-Naguszewska, Bernardo Cornejo
article en

Abstract

Supernova (SN) explosions interacting with dense circumstellar medium are considered to be very promising sites for efficient cosmic-ray (CR) acceleration and subsequent emission of neutral- pion-decay gamma rays. These environments share similarities with already detected gamma-ray novae, but with much greater available energy content, so it is important to characterize their emission in the very-high-energy range. We present the results of H.E.S.S. observations of one such candidate source – SN 2024ggi, located in NGC 3621 at a distance of 7.24 Mpc. A total of 30 hours of data, gathered throughout a month of post-explosion observations, provide flux upper limits that are used to constrain source parameters, offering meaningful insights for theoretical predictions. We exclude bright gamma-ray emission in the first day after explosion, and later upper limits are consistent with wind densities derived from optical observations.

Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), CEA Paris-Saclay (FR), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR)
National Aeronautics and Space Administration, Space Telescope Science Institute, Department of Science and Innovation, South Africa, Queen's University Belfast, National Research Foundation, Universiteit van Amsterdam, Bundesministerium für Bildung und Forschung, Austrian Science Fund, Queen's University, Nuclear Safety and Security Commission, Max-Planck-Gesellschaft, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, National Commission on Research, Science and Technology, University of Namibia, Bundesministerium für Bildung, Wissenschaft und Forschung, Science and Technology Facilities Council, Japan Society for the Promotion of Science, Institut National de Physique Nucléaire et de Physique des Particules
Openalex Percentile: Top 82%
Gamma-ray bursts and supernovae
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