* Astronomy

The Vela 4 satellite detected the first gamma-ray burst (GRB 670702) on July 2, 1967

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The Very First Gamma-Ray Burst

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GRB 670702 1 ,the rst detected GRB,showed two peaks in burst activity over a period of seconds.The rst peak lasted for about an eighth of a second and the second one lasted for about four seconds.This discovery,however,was not published until 1973 (Klebesadel et al.,1973). Figure 2.1 The light curve of GRB 670702. 1 GRBs are designated by the date of their detection.For example,GRB 670702 is the burst that has been detected on July 02,1967. 4
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