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We calculate the neutral pion photoproduction on the proton near threshold incovariant baryon chiral perturbation theory, including the $\Delta(1232)$resonance as an explicit degree of freedom, up to chiral order $p^{7/2}$ in the$\delta$ counting. We compare our results with recent low-energy data from theMainz Microtron for angular distributions and photon asymmetries. Theconvergence of the chiral series of the covariant approach is found to improvesubstantially with the inclusion of the $\Delta(1232)$ resonance.

$\Delta(1232)$ resonance in the $\vec{\gamma}p\rightarrow p\pi^0$ reaction at threshold