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The discovery of the short GRB 090510 has raised considerable attentionmainly because it had a bright optical afterglow and it is among the mostenergetic events detected so far within the entire GRB population. Theafterglow was observed with swift/UVOT and swift/XRT and evidence of a jetbreak around 1.5 ks after the burst has been reported in the literature,implying that after this break the optical and X-ray light curve should fadewith the same decay slope. As noted by several authors, the post-break decayslope seen in the UVOT data is much shallower than the steep decay in the X-rayband, pointing to an excess of optical flux at late times. We reduced andanalyzed new afterglow light-curve data obtained with the multichannel imagerGROND. Based on the densely sampled data set obtained with GROND, we find thatthe optical afterglow of GRB 090510 did indeed enter a steep decay phasestarting around 22 ks after the burst. During this time the GROND optical lightcurve is achromatic, and its slope is identical to the slope of the X-ray data.In combination with the UVOT data this implies that a second break must haveoccurred in the optical light curve around 22 ks post burst, which, however,has no obvious counterpart in the X-ray band, contradicting the interpretationthat this could be another jet break. The GROND data provide the missing pieceof evidence that the optical afterglow of GRB 090510 did follow a post-jetbreak evolution at late times.

The late-time afterglow of the extremely energetic short burst GRB 090510 revisited