  As progenitors of gamma-ray bursts (GRBs), core collapse of massive stars and
coalescence of compact object binaries are believed to be powerful sources of
gravitational waves (GWs). In the collapsar scenario, a rotating stellar-mass
black hole (BH) surrounded by a hyperaccretion disk might be running in the
center of a massive collapsar, which is one of the plausible central engines of
long GRBs. Such a BH hyperaccretion disk would be in a state of a
neutrino-dominated accretion flow (NDAF) at the initial stage of the accretion
process; meanwhile, the jets attempt to break out from the envelope and
circumstellar medium to power GRBs. In addition to collapsars, the BH
hyperaccretion systems are important sources of neutrinos and GWs. In this
paper, we investigated the GW emission generated by the anisotropic neutrino
emission from NDAFs in the collapsar scenarios. As the results indicate, the
typical frequency of GWs is $\sim$ 1-100 Hz, and the masses and metallicities
of the progenitor stars have slight effects on the GW strains. The GWs from
NDAFs might be detected by operational or planned detectors at the distance of
10 kpc. Moreover, comparisons of the detectable GWs from collapsars, NDAFs, and
GRB jets (internal shocks) are displayed. By combining the electromagnetic
counterparts, neutrinos, and GWs, one may constrain the characteristics of
collapsars and central BH accretion systems.

High Energy Astrophysical Phenomena