is the process of taking triggered data and reconstructing various properties of the events, such as core location, zenith and azimuth angles, and primary energy. HAWC event reconstruction is performed using the Analysis and Event-Reconstruction Integrated Environment (AERIE). AERIE is written in C++ and contains various services
, classes that aid in reconstruction. Services are configured in a sequence called a reconstruction chain
and are executed in a prescribed order. Each service can add information into the bag
, an object that contains all the event-wise information produced by the reconstruction. The end result is an XCDF or ROOT file containing a subset of the information in the bag.