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The radio flare and multi-wavelength afterglow of the short GRB 231117A: energy injection from a violent shell collision

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	Anderson, G. E., Lamb, G. P., Gompertz, B. P., Rhodes, L., Martin-Carrillo, A., van der Horst, A. J., Rowlinson, A., Bell, M. E., Chen, T. -W., Fausey, H. M., Ferro, M., Hancock, P. J., Oates, S. R., Schulze, S., Starling, R. L. C., Yang, S., Ackley, K., Anderson, J. P., Andersson, A., Fernández, J. F. Agüí, Brivio, R., Burns, E., Chambers, K. C., de Boer, T., D'Elia, V., De Pasquale, M., Postigo, A. de Ugarte, Dimple, Fender, R., Fulton, M. D., Gao, H., Gillanders, J. H., Green, D. A., Gromadzki, M., Gulati, A., Hartmann, D. H., Huber, M. E., Kuin, N. P. M., Leung, J. K., Levan, A. J., Lin, C. -C., Magnier, E., Malesani, D. B., Minguez, P., Mooley, K. P., Mukherjee, T., Nicholl, M., O'Brien, P. T., Pugliese, G., Rossi, A., Ryder, S. D., Sbarufatti, B., Schneider, B., Schüssler, F., Smartt, S. J., Smith, K. W., Srivastav, S., Steeghs, D., Tanvir, N. R., Thoene, C. C., Vergani, S. D., Wainscoat, R. J., Wang, Z. -N., Wijers, R. A. M. J., Williams-Baldwin, D., Worssam, I., Zafar, T.
Formato:	Preprint
Publicado:	2025
Materias:	High Energy Astrophysical Phenomena
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

_version_	1866916910053982208
author	Anderson, G. E. Lamb, G. P. Gompertz, B. P. Rhodes, L. Martin-Carrillo, A. van der Horst, A. J. Rowlinson, A. Bell, M. E. Chen, T. -W. Fausey, H. M. Ferro, M. Hancock, P. J. Oates, S. R. Schulze, S. Starling, R. L. C. Yang, S. Ackley, K. Anderson, J. P. Andersson, A. Fernández, J. F. Agüí Brivio, R. Burns, E. Chambers, K. C. de Boer, T. D'Elia, V. De Pasquale, M. Postigo, A. de Ugarte Dimple Fender, R. Fulton, M. D. Gao, H. Gillanders, J. H. Green, D. A. Gromadzki, M. Gulati, A. Hartmann, D. H. Huber, M. E. Kuin, N. P. M. Leung, J. K. Levan, A. J. Lin, C. -C. Magnier, E. Malesani, D. B. Minguez, P. Mooley, K. P. Mukherjee, T. Nicholl, M. O'Brien, P. T. Pugliese, G. Rossi, A. Ryder, S. D. Sbarufatti, B. Schneider, B. Schüssler, F. Smartt, S. J. Smith, K. W. Srivastav, S. Steeghs, D. Tanvir, N. R. Thoene, C. C. Vergani, S. D. Wainscoat, R. J. Wang, Z. -N. Wijers, R. A. M. J. Williams-Baldwin, D. Worssam, I. Zafar, T.
author_facet	Anderson, G. E. Lamb, G. P. Gompertz, B. P. Rhodes, L. Martin-Carrillo, A. van der Horst, A. J. Rowlinson, A. Bell, M. E. Chen, T. -W. Fausey, H. M. Ferro, M. Hancock, P. J. Oates, S. R. Schulze, S. Starling, R. L. C. Yang, S. Ackley, K. Anderson, J. P. Andersson, A. Fernández, J. F. Agüí Brivio, R. Burns, E. Chambers, K. C. de Boer, T. D'Elia, V. De Pasquale, M. Postigo, A. de Ugarte Dimple Fender, R. Fulton, M. D. Gao, H. Gillanders, J. H. Green, D. A. Gromadzki, M. Gulati, A. Hartmann, D. H. Huber, M. E. Kuin, N. P. M. Leung, J. K. Levan, A. J. Lin, C. -C. Magnier, E. Malesani, D. B. Minguez, P. Mooley, K. P. Mukherjee, T. Nicholl, M. O'Brien, P. T. Pugliese, G. Rossi, A. Ryder, S. D. Sbarufatti, B. Schneider, B. Schüssler, F. Smartt, S. J. Smith, K. W. Srivastav, S. Steeghs, D. Tanvir, N. R. Thoene, C. C. Vergani, S. D. Wainscoat, R. J. Wang, Z. -N. Wijers, R. A. M. J. Williams-Baldwin, D. Worssam, I. Zafar, T.
contents	We present the early radio detection and multi-wavelength modeling of the short gamma-ray burst (GRB) 231117A at redshift $z=0.257$. The Australia Telescope Compact Array automatically triggered a 9-hour observation of GRB 231117A at 5.5 and 9 GHz following its detection by the Neil Gehrels Swift Observatory just 1.3 hours post-burst. Splitting this observation into 1-hour time bins, the early radio afterglow exhibited flaring, scintillating and plateau phases. The scintillation allowed us to place the earliest upper limit ($<10$ hours) on the size of a GRB blast wave to date, constraining it to $<1\times10^{16}$ cm. Multi-wavelength modeling of the full afterglow required a period of significant energy injection between $\sim 0.02$ and $1$ day. The energy injection was modeled as a violent collision of two shells: a reverse shock passing through the injection shell explains the early radio plateau, while an X-ray flare is consistent with a shock passing through the leading impulsive shell. Beyond 1 day, the blast wave evolves as a classic decelerating forward shock with an electron distribution index of $p=1.66\pm0.01$. Our model also indicates a jet-break at $\sim2$ days, and a half-opening angle of $θ_j=16\mathring{.}6 \pm 1\mathring{.}1$. Following the period of injection, the total energy is $ζ\sim18$ times the initial impulsive energy, with a final collimation-corrected energy of $E_{\mathrm{Kf}}\sim5.7\times10^{49}$ erg. The minimum Lorentz factors this model requires are consistent with constraints from the early radio measurements of $Γ>35$ to $Γ>5$ between $\sim0.1$ and $1$ day. These results demonstrate the importance of rapid and sensitive radio follow-up of GRBs for exploring their central engines and outflow behaviour.
format	Preprint
id	arxiv_https___arxiv_org_abs_2508_14650
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	The radio flare and multi-wavelength afterglow of the short GRB 231117A: energy injection from a violent shell collision Anderson, G. E. Lamb, G. P. Gompertz, B. P. Rhodes, L. Martin-Carrillo, A. van der Horst, A. J. Rowlinson, A. Bell, M. E. Chen, T. -W. Fausey, H. M. Ferro, M. Hancock, P. J. Oates, S. R. Schulze, S. Starling, R. L. C. Yang, S. Ackley, K. Anderson, J. P. Andersson, A. Fernández, J. F. Agüí Brivio, R. Burns, E. Chambers, K. C. de Boer, T. D'Elia, V. De Pasquale, M. Postigo, A. de Ugarte Dimple Fender, R. Fulton, M. D. Gao, H. Gillanders, J. H. Green, D. A. Gromadzki, M. Gulati, A. Hartmann, D. H. Huber, M. E. Kuin, N. P. M. Leung, J. K. Levan, A. J. Lin, C. -C. Magnier, E. Malesani, D. B. Minguez, P. Mooley, K. P. Mukherjee, T. Nicholl, M. O'Brien, P. T. Pugliese, G. Rossi, A. Ryder, S. D. Sbarufatti, B. Schneider, B. Schüssler, F. Smartt, S. J. Smith, K. W. Srivastav, S. Steeghs, D. Tanvir, N. R. Thoene, C. C. Vergani, S. D. Wainscoat, R. J. Wang, Z. -N. Wijers, R. A. M. J. Williams-Baldwin, D. Worssam, I. Zafar, T. High Energy Astrophysical Phenomena We present the early radio detection and multi-wavelength modeling of the short gamma-ray burst (GRB) 231117A at redshift $z=0.257$. The Australia Telescope Compact Array automatically triggered a 9-hour observation of GRB 231117A at 5.5 and 9 GHz following its detection by the Neil Gehrels Swift Observatory just 1.3 hours post-burst. Splitting this observation into 1-hour time bins, the early radio afterglow exhibited flaring, scintillating and plateau phases. The scintillation allowed us to place the earliest upper limit ($<10$ hours) on the size of a GRB blast wave to date, constraining it to $<1\times10^{16}$ cm. Multi-wavelength modeling of the full afterglow required a period of significant energy injection between $\sim 0.02$ and $1$ day. The energy injection was modeled as a violent collision of two shells: a reverse shock passing through the injection shell explains the early radio plateau, while an X-ray flare is consistent with a shock passing through the leading impulsive shell. Beyond 1 day, the blast wave evolves as a classic decelerating forward shock with an electron distribution index of $p=1.66\pm0.01$. Our model also indicates a jet-break at $\sim2$ days, and a half-opening angle of $θ_j=16\mathring{.}6 \pm 1\mathring{.}1$. Following the period of injection, the total energy is $ζ\sim18$ times the initial impulsive energy, with a final collimation-corrected energy of $E_{\mathrm{Kf}}\sim5.7\times10^{49}$ erg. The minimum Lorentz factors this model requires are consistent with constraints from the early radio measurements of $Γ>35$ to $Γ>5$ between $\sim0.1$ and $1$ day. These results demonstrate the importance of rapid and sensitive radio follow-up of GRBs for exploring their central engines and outflow behaviour.
title	The radio flare and multi-wavelength afterglow of the short GRB 231117A: energy injection from a violent shell collision
topic	High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2508.14650