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On the Sun,jets in light bridges are frequently observed with high-resolutioninstruments.The respective roles played by convection and the magnetic field intriggering such jets are not yet clear.We report a small fan-shaped jet along aLB observed by the 1.6m Goode Solar Telescope(GST) with the TiO BroadbandFilter Imager(BFI),the Visible Imaging Spectrometer(VIS) in H{\alpha},and theNear-InfraRed Imaging Spectropolarimeter(NIRIS),along with the Stokesparameters.The high spatial and temporal resolution of those instrumentsallowed us to analyze the features identified during the jet event.Byconstructing the H{\alpha} Dopplergrams,we found that the plasma is firstmoving upward,whereas during the second phase of the jet,the plasma is flowingback.Working with time slice diagrams,we investigated the propagation-projectedspeed of the fan and its bright base.The fan-shaped jet developed within a fewminutes,with diverging beams. At its base,a bright point was slipping along theLB and ultimately invaded the umbra of the sunspot.The H{\alpha} profiles ofthe bright points enhanced the intensity in the wings, similarly to the case ofEllerman bombs.Co-temporally,the extreme ultraviolet brightenings developed atthe front of the dark material jet and moved at the same speed as the fan,leading us to propose that the fan-shaped jet material compressed and heatedthe ambient plasma at its extremities in the corona.Our multi-wavelengthanalysis indicates that the fan-shaped jet could result from magneticreconnection across the highly diverging field low in the chromosphere,leadingto an apparent slipping motion of the jet material along the LB.However,we didnot find any opposite magnetic polarity at the jet base,as would typically beexpected in such a configuration.We therefore discuss other plausible physicalmechanisms,based on waves and convection, that may have triggered the event.

Fan-shaped jet close to a light bridge