  We present the first release of the Gravitational Wave AfterglowPy Analysis
(GWAPA) webtool. GWAPA is designed to provide the community with an interactive
tool for rapid analysis of gravitational wave afterglow counterparts and can be
extended to the general case of gamma-ray burst afterglows seen at different
angles. It is based on the afterglowpy package and allows users to upload
observational data and vary afterglow parameters to infer the properties of the
explosion. Multiple jet structures, including top hat, Gaussian and power laws,
in addition to a spherical outflow model are implemented. A Python script for
MCMC fitting is also available to download, with initial guesses taken from
GWAPA.
