id	keyword
ap-9987	gravitational
ap-9987	et al
ap-9987	merger
ap-9987	abbott
ap-9987	neutron
ap-9987	journal
ap-9987	wave
ap-9987	mass
ap-9987	letters
ap-9987	review
ap-9987	star
ap-9987	binary
ap-9987	gw170817