On the association between a γ-ray burst and a radio pulse

Abstract

ONE minute after the γ-ray burst of 16 August 1976, a radio event with ∼ 30s duration was recorded by three different instruments, a dipole array and a 10-m parabola at Medicina (Bologna), and a 10-m parabola at Trieste (400km away) (refs 1 and 2). The peak intensity at 151 and 408 MHz was ∼ 10⁻²¹W m⁻² Hz with an upper limit to the dispersion between the two frequencies of ∼ 10 s. In the absence of specific data on the γ-ray flux we take a typical value of 10⁻⁴ erg cm⁻² corresponding to an energy output of 10³⁸ d₁₀₀² erg, where d₁₀₀ is the distance in units of 100 pc.