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  Short GRB 160821B: a reverse shock, a refreshed shock, and a well-sampled kilonova

Lamb, G. P., Tanvir, N. R., Levan, A. J., Postigo, A. d. U., Kawaguchi, K., Corsi, A., et al. (2019). Short GRB 160821B: a reverse shock, a refreshed shock, and a well-sampled kilonova. The Astrophysical Journal, 883(1): 48. doi:10.3847/1538-4357/ab38bb.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-4504-A Version Permalink: http://hdl.handle.net/21.11116/0000-0004-E31F-A
Genre: Journal Article

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 Creators:
Lamb, G. P., Author
Tanvir, N. R., Author
Levan, A. J., Author
Postigo, A. de Ugarte, Author
Kawaguchi, K.1, Author              
Corsi, A., Author
Evans, P. A., Author
Malesani, D. B., Author
Page, K. L., Author
Wiersema, K., Author
Fruchter, A. S., Author
Gompertz, B., Author
Rosswog, S., Author
Shibata, M.2, Author              
Tanaka, M., Author
van der Horst, A. J., Author
Cano, Z., Author
Fynbo, J. P. U., Author
Greiner, J., Author
Heintz, K., Author
Higgins, A., AuthorHjorth, J., AuthorIzzo, L., AuthorJakobsson, P., AuthorKann, D. A., AuthorO'Brien, P. T., AuthorPerley, D. A., AuthorPian, E., AuthorPugliese, G., AuthorStarling, R. L. C., AuthorThöne, C. C., AuthorWatson, D., AuthorWijers, R. A. M. J., AuthorXu, D., Author more..
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              
2Computational Relativistic Astrophysics, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_2541714              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 Abstract: We report our identification of the optical afterglow and host galaxy of the short-duration gamma-ray burst sGRB 160821Bb. The spectroscopic redshift of the host is $z=0.162$, making it one of the lowest redshift sGRBs identified by Swift. Our intensive follow-up campaign using a range of ground-based facilities as well as HST, XMM and Swift, shows evidence for a late-time excess of optical and near-infrared emission in addition to a complex afterglow. The afterglow light-curve at X-ray frequencies reveals a narrow jet, $\theta_j\sim1.9$ deg, that is refreshed at $>1$ day post-burst by a slower outflow with significantly more energy than the initial outflow that produced the main GRB. Observations of the 5 GHz radio afterglow shows a reverse shock into a mildly magnetised shell. The optical and near-infrared excess is fainter than AT2017gfo associated with GW170817, and is well explained by a kilonova with dynamic ejecta mass $M_{\rm dyn}=(2.0\pm1.2)\times10^{-3}$\,M$_{\odot}$ and a secular ejecta mass with $M_{\rm pm}= 1.0\pm0.6)\times10^{-2}$\,M$_\odot$, consistent with a binary neutron star merger resulting in a short-lived massive neutron star. This optical and near-infrared dataset provides the best-sampled kilonova light-curve without a gravitational wave trigger to date.

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 Dates: 2019-05-062019-05-082019
 Publication Status: Published in print
 Pages: 15 pages, 6 figures, submitted to ApJ - (typos and affiliations in author list corrected, references added)
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1905.02159
URI: http://arxiv.org/abs/1905.02159
DOI: 10.3847/1538-4357/ab38bb
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 883 (1) Sequence Number: 48 Start / End Page: - Identifier: -