  General relativistic imprints on the galaxy bispectrum arise from
observational (or projection) effects. The lightcone projection effects include
local contributions from Doppler and gravitational potential terms, as well as
lensing and other integrated contributions. We recently presented for the first
time, the correction to the galaxy bispectrum from all local lightcone
projection effects up to second order in perturbations. Here we provide the
details underlying this correction, together with further results and
illustrations. For moderately squeezed shapes, the correction to the Newtonian
prediction is ~30% on equality scales at z ~ 1. We generalise our recent
results to include the contribution, up to second order, of magnification bias
(which affects some of the local terms) and evolution bias.
