  On August 17, 2017 at 12:41:06 UTC the Fermi Gamma-ray Burst Monitor (GBM)
detected and triggered on the short gamma-ray burst GRB 170817A. Approximately
1.7 s prior to this GRB, the Laser Interferometer Gravitational-Wave
Observatory (LIGO) triggered on a binary compact merger candidate associated
with the GRB. This is the first unambiguous coincident observation of
gravitational waves and electromagnetic radiation from a single astrophysical
source and marks the start of gravitational-wave multi-messenger astronomy. We
report the GBM observations and analysis of this ordinary short GRB, which
extraordinarily confirms that at least some short GRBs are produced by binary
compact mergers.
