Gamma ray bursts and the origin of galactic positrons

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Abstract
A recent observation of the 511 keV electron-positron annihilation line from the Galactic bulge has prompted a debate on the origin of the galactic positrons responsible for this emission. We suggest that the positrons could be produced by past gamma ray bursts in our galaxy. Future observations can help distinguish our model from other scenarios, in particular, from those that invoke decaying or annihilating dark matter particles.

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