Аннотация:On August 17, 2017 at 12∶41:04 UTC the Advanced LIGO and Advanced Virgo gravitational-wave detectors made their first observation of a binary neutron star inspiral. The signal, GW170817, was detected with a combined signal-to-noise ratio of 32.4 and a false-alarm-rate estimate of less than one per
8.0
×
10
4
years
. We infer the component masses of the binary to be between 0.86 and
2.26
M
⊙
, in agreement with masses of known neutron stars. Restricting the component spins to the range inferred in binary neutron stars, we find the component masses to be in the range
1.17
–
1.60
M
⊙
, with the total mass of the system
2.7
4
+
0.04
−
0.01
M
⊙
. The source was localized within a sky region of
28
deg
2
(90% probability) and had a luminosity distance of
4
0
+
8
−
14
Mpc
, the closest and most precisely localized gravitational-wave signal yet. The association with the
γ
-ray burst GRB 170817A, detected by Fermi-GBM 1.7 s after the coalescence, corroborates the hypothesis of a neutron star merger and provides the first direct evidence of a link between these mergers and short
γ
-ray bursts. Subsequent identification of transient counterparts across the electromagnetic spectrum in the same location further supports the interpretation of this event as a neutron star merger. This unprecedented joint gravitational and electromagnetic observation provides insight into astrophysics, dense matter, gravitation, and cosmology.