Speaker
Giancarlo Ghirlanda
(Istituto Nazionale di Astrofisica (INAF))
Description
Radio observations of the first gravitational wave event with an electromagnetic counterpart (GRB170817) has shown unexpected features. The long lived, slowly rising, non--thermal radio emission (together with optical and X--ray observations), between 10 and 200 days after the BNS merger, is consistent with being produced by either a narrowly collimated or an isotropic outflow with geometrical and/or dynamical structure. Global-VLBI observations, owing to the exquisite angular resolution, hold the key to distinguish between these two models answering the question weather a relativistic jet emerged from the merger. Implications for the event rate and jet physics will be discussed.
Primary author
Giancarlo Ghirlanda
(Istituto Nazionale di Astrofisica (INAF))
