Late-afterglow Emission from a Quasi-spherical Outflow in a stratified environment
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arXiv
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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Fraija, Nissim Betancourt-Kamenetskaia, Boris Galván, Antonio Montalvo, Alvaro Pedreira, A. C. Caligula Do E. S. Veres, Peter Becerra, Rosa Leticia Dainotti, Maria G. Dichiara, Simone Vargas, Hermes León |
| author_facet | Fraija, Nissim Betancourt-Kamenetskaia, Boris Galván, Antonio Montalvo, Alvaro Pedreira, A. C. Caligula Do E. S. Veres, Peter Becerra, Rosa Leticia Dainotti, Maria G. Dichiara, Simone Vargas, Hermes León |
| contents | Gamma-ray bursts (GRBs) are cosmic events occurring at large distances beyond our galaxy. They provide a unique opportunity to study electromagnetic patterns not seen elsewhere. When the collimated GRB outflow interacts with the outer layers of a star or the wind generated by a binary neutron star merger, it releases energy, forming a quasi-spherical outflow around it. This broad outflow begins to radiate once it has transferred enough energy to the surrounding medium. We have developed a new analytical model that describes the synchrotron afterglow scenario of the quasi-spherical outflow, including factors such as stratified density, self-absorption regime, and the fraction of electrons accelerated by the shock front. We also successfully describe the multiwavelength observations of a sample of llGRB afterglows (GRB 980425, 031203, 060218, 100316D, 130603B, 150101B and 171205A) that exhibited a late component, analyzed in both stellar wind and constant-density environments. Our analysis shows that a constant-density environment is favored. Additionally, we consider the multiwavelength upper limits of the short bursts reported in the Swift-BAT database. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_00248 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Late-afterglow Emission from a Quasi-spherical Outflow in a stratified environment Fraija, Nissim Betancourt-Kamenetskaia, Boris Galván, Antonio Montalvo, Alvaro Pedreira, A. C. Caligula Do E. S. Veres, Peter Becerra, Rosa Leticia Dainotti, Maria G. Dichiara, Simone Vargas, Hermes León High Energy Astrophysical Phenomena Gamma-ray bursts (GRBs) are cosmic events occurring at large distances beyond our galaxy. They provide a unique opportunity to study electromagnetic patterns not seen elsewhere. When the collimated GRB outflow interacts with the outer layers of a star or the wind generated by a binary neutron star merger, it releases energy, forming a quasi-spherical outflow around it. This broad outflow begins to radiate once it has transferred enough energy to the surrounding medium. We have developed a new analytical model that describes the synchrotron afterglow scenario of the quasi-spherical outflow, including factors such as stratified density, self-absorption regime, and the fraction of electrons accelerated by the shock front. We also successfully describe the multiwavelength observations of a sample of llGRB afterglows (GRB 980425, 031203, 060218, 100316D, 130603B, 150101B and 171205A) that exhibited a late component, analyzed in both stellar wind and constant-density environments. Our analysis shows that a constant-density environment is favored. Additionally, we consider the multiwavelength upper limits of the short bursts reported in the Swift-BAT database. |
| title | Late-afterglow Emission from a Quasi-spherical Outflow in a stratified environment |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2510.00248 |