File:AT2017gfo (SSS17a) location within NGC 4993 galaxy.jpg

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English: Main panel shows the first-epoch F110W HST/WFC3-IR image of the field of AT2017gfo indicating its location within NGC 4993. The physical scale assuming a distance of 40 Mpc is shown. The sequence of panels on the right shows VISTA imaging (RGB rendition created from $Y,J,{K}_{s}$ images) from pre-discovery (2014; top), discovery (middle), and at 8.5 days post-merger as the transient was fading and becoming increasingly red (bottom).
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The Emergence of a Lanthanide-rich Kilonova Following the Merger of Two Neutron Stars

http://iopscience.iop.org/article/10.3847/2041-8213/aa90b6 DOI: 10.3847/2041-8213/aa90b6
Author N. R. Tanvir, A. J. Levan, C. González-Fernández, O. Korobkin, I. Mandel et al.

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