Report
The Afterglow and Kilonova of the Short GRB 160821B
| العنوان: | The Afterglow and Kilonova of the Short GRB 160821B |
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| المؤلفون: | E. Troja, A. J. Castro-Tirado, J Becerra Gonzalez, Y. Hu, G. S. Ryan, S. B. Cenko, R. Ricci, G. Novara, R. Sanchez-Ramirez, J. A. Acosta-Pulido, K. D. Ackley, M. D. Caballero Garcıa, S. S. Eikenberry, S. Guziy, S. Jeong, A. Y. Lien, I. Marquez, S. B. Pandey, I. H. Park, T. Sakamoto, J. C. Tello, I. V. Sokolov, V. V. Sokolov, A. Tiengo, A. F. Valeev, B. B. Zhang, S. Veilleux |
| المصدر: | Monthly Notices of the Royal Astronomical Society. 489(2) |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Astronomy |
| الوصف: | GRB 160821B is a short duration gamma-ray burst (GRB) detected and localized by the Neil Gehrels Swift Observatory in the outskirts of a spiral galaxy at z = 0.1613, at a projected physical offset of 16 kpc from the galaxy’s center. We present X-ray, optical/nIR, and radio observations of its counterpart and model them with two distinct components of emission: a standard afterglow, arising from the interaction of the relativistic jet with the surrounding medium, and a kilonova, powered by the radioactive decay of the sub-relativistic ejecta. Broadband modelling of the afterglow data reveals a weak reverse shock propagating backward into the jet, and a likely jet-break at 3.5 d. This is consistent with a structured jet seen slightly off-axis (θview ∼ θcore) while expanding into a low-density medium (n ≈ 10−3 cm−3). Analysis of the kilonova properties suggests a rapid evolution towards red colours, similar toAT2017gfo, and a low-nIR luminosity, possibly due to the presence of a long-lived neutron star. The global properties of the environment, the inferred low mass (Mej <~ 0.006 Msun) and velocities (vej >~ 0.05c) of lanthanide-rich ejecta are consistent with a binary neutron star merger progenitor. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| تدمد: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stz2255 |
| URL الوصول: | https://ntrs.nasa.gov/citations/20210014088 |
| ملاحظات: | 80GSFC17M0002 789737 NSF AST-1005313 STSI HST-GO14357 STSI HST-GO14087 STSI HST-GO14607 STSI HST-GO14850 SEV-2017-0709 AST-0352664 2015-046-R.0 EUH 654215 201406660015 ASI–INAF 2017-14-H.0 |
| رقم الانضمام: | edsnas.20210014088 |
| قاعدة البيانات: | NASA Technical Reports |
Full Text Finder | تدمد: | 13652966 00358711 |
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| DOI: | 10.1093/mnras/stz2255 |