A Radio Flare in the Long-Lived Afterglow of the Distant Short GRB 210726A: Energy Injection or a Reverse Shock from Shell Collisions?
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866917728274612224 |
|---|---|
| author | Schroeder, Genevieve Rhodes, Lauren Laskar, Tanmoy Nugent, Anya Escorial, Alicia Rouco Rastinejad, Jillian C. Fong, Wen-fai van der Horst, Alexander J. Veres, Péter Alexander, Kate D. Andersson, Alex Berger, Edo Blanchard, Peter K. Chastain, Sarah Christensen, Lise Fender, Rob Green, David A. Groot, Paul Heywood, Ian Horesh, Assaf Izzo, Luca Kilpatrick, Charles D. Körding, Elmar Lien, Amy Malesani, Daniele B. McBride, Vanessa Mooley, Kunal Rowlinson, Antonia Sears, Huei Stappers, Ben Tanvir, Nial Vergani, Susanna D. Wijers, Ralph A. M. J. Williams-Baldwin, David Woudt, Patrick |
| author_facet | Schroeder, Genevieve Rhodes, Lauren Laskar, Tanmoy Nugent, Anya Escorial, Alicia Rouco Rastinejad, Jillian C. Fong, Wen-fai van der Horst, Alexander J. Veres, Péter Alexander, Kate D. Andersson, Alex Berger, Edo Blanchard, Peter K. Chastain, Sarah Christensen, Lise Fender, Rob Green, David A. Groot, Paul Heywood, Ian Horesh, Assaf Izzo, Luca Kilpatrick, Charles D. Körding, Elmar Lien, Amy Malesani, Daniele B. McBride, Vanessa Mooley, Kunal Rowlinson, Antonia Sears, Huei Stappers, Ben Tanvir, Nial Vergani, Susanna D. Wijers, Ralph A. M. J. Williams-Baldwin, David Woudt, Patrick |
| contents | We present the discovery of the radio afterglow of the short $γ$-ray burst (GRB) 210726A, localized to a galaxy at a photometric redshift of $z\sim 2.4$. While radio observations commenced $\lesssim 1~$day after the burst, no radio emission was detected until $\sim11~$days. The radio afterglow subsequently brightened by a factor of $\sim 3$ in the span of a week, followed by a rapid decay (a "radio flare"). We find that a forward shock afterglow model cannot self-consistently describe the multi-wavelength X-ray and radio data, and underpredicts the flux of the radio flare by a factor of $\approx 5$. We find that the addition of substantial energy injection, which increases the isotropic kinetic energy of the burst by a factor of $\approx 4$, or a reverse shock from a shell collision are viable solutions to match the broad-band behavior. At $z\sim 2.4$, GRB 210726A is among the highest redshift short GRBs discovered to date as well as the most luminous in radio and X-rays. Combining and comparing all previous radio afterglow observations of short GRBs, we find that the majority of published radio searches conclude by $\lesssim 10~$days after the burst, potentially missing these late rising, luminous radio afterglows. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_10936 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A Radio Flare in the Long-Lived Afterglow of the Distant Short GRB 210726A: Energy Injection or a Reverse Shock from Shell Collisions? Schroeder, Genevieve Rhodes, Lauren Laskar, Tanmoy Nugent, Anya Escorial, Alicia Rouco Rastinejad, Jillian C. Fong, Wen-fai van der Horst, Alexander J. Veres, Péter Alexander, Kate D. Andersson, Alex Berger, Edo Blanchard, Peter K. Chastain, Sarah Christensen, Lise Fender, Rob Green, David A. Groot, Paul Heywood, Ian Horesh, Assaf Izzo, Luca Kilpatrick, Charles D. Körding, Elmar Lien, Amy Malesani, Daniele B. McBride, Vanessa Mooley, Kunal Rowlinson, Antonia Sears, Huei Stappers, Ben Tanvir, Nial Vergani, Susanna D. Wijers, Ralph A. M. J. Williams-Baldwin, David Woudt, Patrick High Energy Astrophysical Phenomena We present the discovery of the radio afterglow of the short $γ$-ray burst (GRB) 210726A, localized to a galaxy at a photometric redshift of $z\sim 2.4$. While radio observations commenced $\lesssim 1~$day after the burst, no radio emission was detected until $\sim11~$days. The radio afterglow subsequently brightened by a factor of $\sim 3$ in the span of a week, followed by a rapid decay (a "radio flare"). We find that a forward shock afterglow model cannot self-consistently describe the multi-wavelength X-ray and radio data, and underpredicts the flux of the radio flare by a factor of $\approx 5$. We find that the addition of substantial energy injection, which increases the isotropic kinetic energy of the burst by a factor of $\approx 4$, or a reverse shock from a shell collision are viable solutions to match the broad-band behavior. At $z\sim 2.4$, GRB 210726A is among the highest redshift short GRBs discovered to date as well as the most luminous in radio and X-rays. Combining and comparing all previous radio afterglow observations of short GRBs, we find that the majority of published radio searches conclude by $\lesssim 10~$days after the burst, potentially missing these late rising, luminous radio afterglows. |
| title | A Radio Flare in the Long-Lived Afterglow of the Distant Short GRB 210726A: Energy Injection or a Reverse Shock from Shell Collisions? |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2308.10936 |