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Motivated by the newly discovery of a spin period 1.83\,ms pulsarJ1835$-$3259B in the globular cluster (GC) NGC~6652, we analyze the gamma-raydata obtained with the Large Area Telescope (LAT) onboard {\it Fermi Gamma-raySpace Telescope (Fermi)} for the GC and detect the pulsations of thismillisecond pulsar (MSP) at a 5.4$\sigma$ confidence level (the weighted H-testvalue is $\sim 41$). From timing analysis of the data, a pulse profile that issimilar to the radio one is established. We thus consider that we have detectedthe \gr\ emission of the MSP, and discuss the implications. Based on ouranalysis results and different studies of the sources in the GC, the observedgamma-ray emission from the GC could mainly arise from this MSP, like theprevious two cases the GCs NGC~6624 and NGC~6626. Assuming this is the case,the pulsar, at the GC's 9.46\,kpc distance and having a spin-down luminosity of$\leq 4.3\times 10^{35}$ erg s$^{-1}$, would have a gamma-ray luminosity of$\simeq (5.04\pm0.44)\times 10^{34}$ erg s$^{-1}$ and a gamma-ray efficiency of$\gtrsim 0.12$.

Discovery of gamma-ray pulsations of PSR J1835$-$3259B in the Globular Cluster NGC 6652