| Title: |
The Long-lived Broadband Afterglow of Short Gamma-Ray Burst 231117A and the Growing Radio-detected Short Gamma-Ray Burst Population |
| Authors: |
Schroeder, G; Fong, W; Kilpatrick, CD; Rouco Escorial, A; Laskar, T; Nugent, AE; Rastinejad, J; Alexander, KD; Berger, E; Brink, TG; Chornock, R; de Bom, CR; Dong, Y; Eftekhari, T; Filippenko, AV; Fuentes-Carvajal, C; Jacobson-Galán, WV; Malkan, M; Margutti, R; Pearson, J; Rhodes, L; Salinas, R; Sand, DJ; Santana-Silva, L |
| Publisher Information: |
American Astronomical Society |
| Publication Year: |
2025 |
| Collection: |
Oxford University Research Archive (ORA) |
| Description: |
We present multiwavelength observations of the Swift short γ-ray burst GRB 231117A, localized to an underlying galaxy at redshift z = 0.257 at a small projected offset (∼2 kpc). We uncover long-lived X-ray Chandra X-ray Observatory and radio/millimeter (VLA, MeerKAT, and ALMA) afterglow emission, detected to ∼37 days and ∼20 days (rest frame), respectively. We measure a wide jet (∼10 .° 4) and relatively high circumburst density (∼0.07 cm−3) compared to the short GRB population. Our data cannot be easily fit with a standard forward shock model, but they are generally well fit with the incorporation of a refreshed forward shock and a reverse shock at 10−2 cm−3), consistent with their smaller (10°) jets where observational evidence of collimation may only be detectable at radio wavelengths. Owing to improved observing strategies and the emergence of sensitive radio facilities, the number of radio-detected short GRBs has quadrupled in the past decade. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.3847/1538-4357/ada9e5 |
| Availability: |
https://doi.org/10.3847/1538-4357/ada9e5; https://ora.ox.ac.uk/objects/uuid:6593ea1e-2cb9-474a-b66b-86c7f0624d27 |
| Rights: |
info:eu-repo/semantics/openAccess ; CC Attribution (CC BY) |
| Accession Number: |
edsbas.E49C45C6 |
| Database: |
BASE |