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We report on the results of rapid responses to GRB 080330 and GRB 080413A by the ROTSE‐IIIb and ROTSE‐IIIc telecopes. In both cases, optical follow‐up started during the prompt emission phase and recorded optical flares peaking at similar times as the last hard X‐ray pulses detected by the Swift BAT. For both events, the XRT observations started at the end of the prompt BAT detection and displayed an evolution in time opposite to the optical lightcurve. These very early observations provide us an opportunity to probe the onset of afterglow for these two events.

Prompt optical observations of GRB 080330 and GRB 080413A