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18th of October 2017
A Binary Neutron Star Merger
"Multi-messenger Observations of a Binary Neutron Star Merger" by Abbott et al. (2017): "On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected a gamma-ray burst (GRB 170817A) with a time delay of ~1.7s with respect to the merger time. From the gravitational-wave signal, the source was initially localized to a sky region of 31 deg2 at a luminosity distance of 40+-8 Mpc and with component masses consistent with neutron stars. The component masses were later measured to be in the range 0.86 to 2.26 Msun. ... " Radio observations obtained with CSIRO's Australia Telescope Compact Array (ATCA) are discussed as part of the multi-wavelength follow-up campaign. - Further information: LIGO Detection Papers.

The image above shows Figure 1 from the above paper: the localization of the gravitational-wave, gamma-ray, and optical signals (left) and optical images of the apparent host galaxy NGC 4993 (right) .

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