Abstract:
We present results from extensive broadband follow-up of GRB 210204A over the period of 30 d. We detect optical flares in the
afterglow at 7.6 × 105 s and 1.1 × 106 s after the burst: the most delayed flaring ever detected in a GRB afterglow. At the source
redshift of 0.876, the rest-frame delay is 5.8 × 105 s (6.71 d). We investigate possible causes for this flaring and conclude that
the most likely cause is a refreshed shock in the jet. The prompt emission of the GRB is within the range of typical long bursts:
it shows three disjoint emission episodes, which all follow the typical GRB correlations. This suggests that GRB 210204A
might not have any special properties that caused late-time flaring, and the lack of such detections for other afterglows might be
resulting from the paucity of late-time observations. Systematic late-time follow-up of a larger sample of GRBs can shed more
light on such afterglow behaviour. Further analysis of the GRB 210204A shows that the late-time bump in the light curve is
highly unlikely due to underlying SNe at redshift (z) = 0.876 and is more likely due to the late-time flaring activity. The cause
of this variability is not clearly quantifiable due to the lack of multiband data at late-time constraints by bad weather conditions.
The flare of GRB 210204A is the latest flare detected to date.
