Investigating the off-axis GRB afterglow scenario for extragalactic fast X-ray transients

H. C. I. Wichern, M. E. Ravasio, P. G. Jonker +4

Extragalactic fast X-ray transients (FXTs) are short-duration ($\sim$ ks) X-ray flashes of unknown origin, potentially arising from binary neutron star mergers. We investigate the…