  In this work, conserved charges and fluxes at the future null infinity are
determined in the asymptotically flat spacetime for Chern-Simons modified
gravity. The flux-balance laws are used to constrain the memory effects. For
tensor memories, the Penrose's conformal completion method is used to analyze
the asymptotic structures and asymptotic symmetries, and then, conserved
charges for the Bondi-Metzner-Sachs algebra are constructed with the
Wald-Zoupas formalism. These charges take very similar forms to those in
Brans-Dicke theory. For the scalar memory, Chern-Simons modified gravity is
rewritten in the first-order formalism, and the scalar field is replaced by a
2-form field dual to it. With this dual formalism, the scalar memory is
described by the vacuum transition induced by the large gauge transformation of
the 2-form field.
