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Correlation studies of prompt and afterglow emissions from gamma-ray bursts(GRBs) between different spectral bands has been difficult to do in the pastbecause few bursts had comprehensive and intercomparable afterglowmeasurements. In this paper we present a large and uniform data set forcorrelation analysis based on bursts detected by the Swift mission. For thefirst time, short and long bursts can be analyzed and compared. It is found forboth classes that the optical, X-ray and gamma-ray emissions are linearlycorrelated, but with a large spread about the correlation line; stronger burststend to have brighter afterglows, and bursts with brighter X-ray afterglow tendto have brighter optical afterglow. Short bursts are, on average, weaker inboth prompt and afterglow emissions. No short bursts are seen with extremelylow optical to X-ray ratio as occurs for "dark" long bursts. Althoughstatistics are still poor for short bursts, there is no evidence yet for asubgroup of short bursts with high extinction as there is for long bursts. Longbursts are detected in the dark category at the same fraction as for pre-Swiftbursts. Interesting cases are discovered of long bursts that are detected inthe optical, and yet have low enough optical to X-ray ratio to be classified asdark. For the prompt emission, short and long bursts have different averagetracks on flux vs fluence plots. In Swift, GRB detections tend to be fluencelimited for short bursts and flux limited for long events.

Correlations of Prompt and Afterglow Emission in Swift Long and Short Gamma Ray Bursts