Fast Radio Bursts with Extended Gamma-Ray Emission?

Understand

We consider some general implications of bright gamma-ray counterparts to fast radio bursts (FRBs).

• We show that even if these manifest in only a fraction of FRBs, gamma-ray detections with current satellites (including Swift) can provide stringent constraints on cosmological FRB models.
• If the energy is drawn from the magnetic energy of a compact object such as a magnetized neutron star, the sources should be nearby and be very rare.
• If the intergalactic medium is responsible for the observed dispersion measure, the required gamma-ray energy is comparable to that of the early afterglow or extended emission of short gamma-ray bursts.