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GRB~210619B was a bright long gamma-ray burst (GRB) which was opticallyfollowed up by the novel polarimeter MOPTOP on the Liverpool Telescope (LT).This was the first GRB detection by the instrument since it began scienceobservations. MOPTOP started observing the GRB 1388 seconds after the SwiftBurst Alert Telescope (BAT) trigger. The $R$ band light-curve decays followinga broken power law with a break time of 2948 s after the trigger. The decayindex values are $\alpha_1 = 0.84 \pm 0.03$ (pre-break) and $\alpha_2 = 0.54\pm 0.02$ (post-break), indicating that the observation was most probablyduring the forward shock-dominated phase. We find a polarization upper limit of$\sim7$\%. In the forward shock we expect the polarization to mostly come fromdust in the local ambient medium which only produces low degrees ofpolarization. Hence our non-detection of polarization is as expected for thisparticular burst.

GRB 210619B: first gamma-ray burst detection by the novel polarimeter MOPTOP