GRBs with no afterglow even in the Swift Era?

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma-Ray Sources, Gamma-Ray Bursts, Astronomical And Space-Research Instrumentation, X-Ray

Scientific paper

Three years after its launch Swift has successfully localized and observed a few hundred GRBs. Its well-known speed in slewing to the source has led to great discoveries such as the flaring activities in early X-ray afterglows and the detection of Short GRB afterglows. In a few cases, mainly Short GRBs or late observations, XRT did not detect any emission. However, for six Long GRBs XRT could not measure any X-afterglow either, even as early as 100 s after the BAT trigger. In this paper we present a study of these unusual events. We analyse their peculiar behaviour in the Gamma and X-ray bands and discuss their singular origin.

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