Fast Radio Bursts with Extended Gamma-Ray Emission?

Abstract

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. While this can be reconciled with the rotation energy of compact objects, as expected in many merger scenarios, the prompt outflow that yields the gamma-rays is too dense for radio waves to escape. Highly relativistic winds launched in a precursor phase, and forming a wind bubble, may avoid the scattering and absorption limits and could yield FRB emission. Largely independent of source models, we show that detectable radio afterglow emission from gamma-ray bright FRBs can reasonably be anticipated. Gravitational wave searches can also be expected to provide useful tests.

8 pages, version to appear in ApJL, minor changes (references and discussions added)

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Cited by in corpus (12)

• INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
• A "Cosmic Comb" Model of Fast Radio Bursts
• Dispersion Measure Variation of Repeating Fast Radio Burst Sources
• Radio-interferometric monitoring of FRB 131104: A coincident AGN flare, but no evidence for a cosmic fireball
• Search for GeV counterparts to fast radio bursts with Fermi
• What if GW190425 did not produce a black hole promptly?
• Hunting for gamma-ray emission from Fast Radio Bursts
• FRB131104 Swift BAT data revisited: No evidence of a gamma-ray counterpart
• Structured Jet Model for Multiwavelength Observations of the Jetted Tidal Disruption Event AT 2022cmc
• Multi-wavelength afterglow emission from bursts associated with magnetar flares and fast radio bursts
• Quasi-steady emission from repeating fast radio bursts can be explained by magnetar wind nebulae
• Multiwavelength Radiation from the Interaction between Magnetar Bursts and Companion Star in a Binary System