Wednesday

Gamma-ray bursts (GRBs) are one of the most violent phenomena in the
universe. They are generally divided into two categories: short-duration bursts
created by a collision of two compact sources such as binary neutron stars; and
long-duration bursts that are powered by the core collapse of rapidly rotating
massive stars. We expect GRBs to be intrinsically linked to gravitational-wave
(GW) emission, providing an opportunity for multimessenger astronomy. In this
talk, I will present results from targeted GW searches associated with GRBs
during the second Advanced LIGO-Virgo observing run. We have analyzed 42
(98) GRBs with modeled (unmodeled) searches and found no candidates other
than GW170817. I will briefly discuss the case of GW170817-GRB170817A,
as well as results for non-detections: analysis of subthreshold GRB population
and lower bounds on the median source distance for various scenarios of GW
emission. Finally, I will discuss the implications of these results for source rates
and future observing runs.