  Gamma-ray bursts (GRBs), associated with the collapse of massive stars or the
collisions of compact objects, are the most luminous events in our universe.
However, there is still much to learn about the nature of the relativistic jets
launched from the central engines of these objects. We examine how jet
structure - that is, the energy and velocity distribution as a function of
angle - affects observed GRB afterglow light curves. Using the package
afterglowpy, we compute light curves arising from an array of possible jet
structures, and present the suite of models that can fit the coincident
electromagnetic observations of GW190814 (which is likely due to a background
AGN). Our work emphasizes not only the need for broadband spectral and timing
data to distinguish among jet structure models, but also the necessity for high
resolution radio follow-up to help resolve background sources that may mimic a
GRB afterglow.
