GRB 670702

GRB 670702

The Vela satellites which detected the gamma ray burst
Event type	Gamma ray burst
Date	July 1967
Duration	Seconds
Instrument	Vela 4
Notable features	First gamma ray burst discovered
Other designations	GRB 670702

GRB 670702 is a gamma ray burst (GRB) known for being the first gamma ray burst detected in history. It was detected on 2 July 1967 by the Vela 4 satellite, a US satellite that monitored worldwide compliance with the 1963 nuclear test ban treaty. The event lasted around ten seconds with an energy emission in the MeV band and a double pulse light curve. Its properties were distinct from those expected from a nuclear test in space. Directional information strongly suggested an origin distinct from the Earth or Sun.