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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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 Creators:
Lamb, G. P., Author
Tanvir, N. R., Author
Levan, A. J., Author
Postigo, A. de Ugarte, Author
Kawaguchi, Kyohei1, 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.1, 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:
1Computational 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: Issued
 Pages: 15 pages, 6 figures, submitted to ApJ - (typos and affiliations in author list corrected, references added)
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Degree: -

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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: -