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Aug10-11, 07:44 AM
P: 354
Just to add, the rest mass of an electron is 511 keV, so you need at least 511 keV photons, which is solidly in the gamma-ray range. So these are reasonably serious photons. Sure, gamma ray burst photons are plenty high enough energy, but you'll have to wait until they collide with something for a chance they will produce some positrons. I am sure plenty of positrons are produced during gamma ray bursts for other reasons though.