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We present Atacama Large Millimeter/submillimeter Array measurements of the`Cosmic Seagull', a strongly magnified galaxy at z=2.7779 behind the BulletCluster. We report CO(3-2) and continuum 344~$\mu$m (rest-frame) data at one ofthe highest differential magnifications ever recorded at submillimeterwavelengths ($\mu$ up to ~50), facilitating a characterization of thekinematics of a rotational curve in great detail (at ~620 pc resolution in thesource plane). We find no evidence for a decreasing rotation curve, from whichwe derive a dynamical mass of ($6.3\pm0.7)\times10^{10} M_{\odot}$ within $r =2.6\pm0.1$ kpc. The discovery of a third, unpredicted, image provides keyinformation for a future improvement of the lensing modeling of the BulletCluster and allows a measure of the stellar mass,$1.6^{+1.9}_{-0.86}\times10^{10} M_{\odot}$, unaffected by strong differentialmagnification. The baryonic mass is is expected to be dominated by themolecular gas content ($f_{gas} \leq 80 \pm 20$ \%) based on an $M_{H_2}$ massestimated from the difference between dynamical and stellar masses. The starformation rate is estimated via the spectral energy distribution ($SFR = 190\pm 10 M_{\odot}/yr$), implying a molecular gas depletion time of $0.25\pm0.08$Gyr.

The `Cosmic Seagull': a highly magnified disk-like galaxy at z~2.8 behind the Bullet Cluster