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# What Powered the Optical Transient AT2017gfo Associated with GW170817?

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The Astrophysical Journal

American Astronomical Society

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### Most cited references72

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### GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral

(2017)
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### Observation of Gravitational Waves from a Binary Black Hole Merger

On September 14, 2015 at 09:50:45 UTC the two detectors of the Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from 35 to 250 Hz with a peak gravitational-wave strain of $$1.0 \times 10^{-21}$$. It matches the waveform predicted by general relativity for the inspiral and merger of a pair of black holes and the ringdown of the resulting single black hole. The signal was observed with a matched-filter signal-to-noise ratio of 24 and a false alarm rate estimated to be less than 1 event per 203 000 years, equivalent to a significance greater than 5.1 {\sigma}. The source lies at a luminosity distance of $$410^{+160}_{-180}$$ Mpc corresponding to a redshift $$z = 0.09^{+0.03}_{-0.04}$$. In the source frame, the initial black hole masses are $$36^{+5}_{-4} M_\odot$$ and $$29^{+4}_{-4} M_\odot$$, and the final black hole mass is $$62^{+4}_{-4} M_\odot$$, with $$3.0^{+0.5}_{-0.5} M_\odot c^2$$ radiated in gravitational waves. All uncertainties define 90% credible intervals.These observations demonstrate the existence of binary stellar-mass black hole systems. This is the first direct detection of gravitational waves and the first observation of a binary black hole merger.
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### Type I supernovae. I - Analytic solutions for the early part of the light curve

(1982)
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### Author and article information

###### Journal
The Astrophysical Journal
ApJ
American Astronomical Society
2041-8213
July 10 2018
July 05 2018
: 861
: 2
: L12
###### Article
10.3847/2041-8213/aace61