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physical object > natural object > celestial body > gamma ray source > gamma-ray burst

gamma-ray burst
subject			fact

gamma-ray burst	has duration 0.1 - 4 s
	has distribution isotropic with an increase towards the galactic center
	has frequency of occurrence 5 per year
	has energy spectrum 0.1-1.2 MeV
	is a part of celestial sphere
	has discovery date July 2, 1967
	has definition Short, intense, low-energy bursts, first recorded by the Vela satellite system on 1967 July 2. Their isotropic distribution suggests an extragalactic origin, but a galactic disk origin cannot be ruled out: there is a large increase in γ-ray flux in the direction of the galactic center.
	is a kind of gamma ray source
gamma ray source	has wavelength gamma ray
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

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