KNBH-BH (Inspiral)

Summary Table

Category	Progenitor	Type	Energy Mechanism	Emission Mechanism	Counterparts									References	Brief Comments
					LF Radio	HF Radio	Microwave	Terahertz	Optical/IR	X-rays	Gamma-rays	Gravitational Waves	Neutrinos
Merger	KNBH-BH	Single	Mag. flux change	Curv.	Yes	--	--	--	--	Afterglow	sGRB if jet aligned	Yes	--	https://arxiv.org/pdf/1602.04542.pdf	Unlikely to account for full FRB population.

Definitions: LF Radio (3 MHz to 3 GHz); HF Radio (3 GHz to 30 GHz); Microwave (30 to 300 GHz)

Model Description

A binary BH system in which at least one of the spinning BHs carries a charge would induce a global magnetic dipole normal to the orbital plane. During inspiral, as the orbital separation decreases, the magnetic flux of the system changes rapidly, which leads to particle bunching and the emission of coherent curvature radiation. And for some minimal values of the charge of the BH, this scenario could produce an FRB and a sGRB \cite{Zhang:2016rli}. The detection of both signals could provide a lower limit on the charge, and the non-detection of a sGRB could provide an upper limit.