  Observations of short gamma-ray bursts indicate ongoing energy injection
following the prompt emission, with the most likely candidate being the birth
of a rapidly rotating, highly magnetised neutron star. We utilise X-ray
observations of the burst remnant to constrain properties of the nascent
neutron star, including its magnetic field-induced ellipticity and the
saturation amplitude of various oscillation modes. Moreover, we derive strict
upper limits on the gravitational wave emission from these objects by looking
only at the X-ray light curve, showing the burst remnants are unlikely to be
detected in the near future using ground-based gravitational wave
interferometers such as Advanced LIGO.
