GRB 060607A: A Bright Early Optical Afterglow with Minimal Prompt Emission

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The afterglow of the z = 3.08 gamma-ray burst GRB 060607A shows a remarkable, broad, strong peak in the optical reaching maximum brightness at 180 s post-trigger, and not coincident with the strong early-time flares seen in the X-ray and gamma-ray energy bands. The optical rise is sharp, with an increase of nearly 3 mag occurring in roughly 100 s. The initial rise is followed by a slow decay for about the next 1000 s. Optical light curves in several bands show weak evidence for variability superposed on an exponential rise and power-law decay. An episode of nearly constant emission starts about 1000 s after the trigger and lasts for several hundred seconds before fading resumes. While previous optical afterglows have been observed with a well-sampled flare during times with simultaneous X-ray and gamma ray data, the afterglow of GRB 060607A is unique compared to the others in that it shows no evidence for correlated prompt emission. This allows us to test predictions that assert that early optical flux is a convolution of a prompt component and a related delayed response component, which is dependent on properties of the system.

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