  Gamma-ray Bursts (GRBs) are flashes of gamma-rays thought to originate from
rare forms of massive star collapse (long GRBs), or from mergers of compact
binaries (short GRBs) containing at least one neutron star (NS). The nature of
the post-explosion / post-merger remnant (NS versus black hole, BH) remains
highly debated. In ~50% of both long and short GRBs, the temporal evolution of
the X-ray afterglow that follows the flash of gamma-rays is observed to
"plateau" on timescales of 100-10000 s since explosion, possibly signaling the
presence of energy injection from a long-lived, highly magnetized NS
(magnetar). The Cross-Correlation Algorithm (CoCoA) proposed by [R. Coyne et.
al., (2016)] aims to optimize searches for intermediate-duration (100-10000s)
gravitational waves (GWs) from GRB remnants. In this work, we test CoCoA on
real data collected with ground-based GW detectors. We further develop the
detection statistics on which CoCoA is based to allow for multi-waveform
searches spanning a physically-motivated parameter space, so as to account for
uncertainties in the physical properties of GRB remnants.
