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The interpretation of the Swift GRB X-ray afterglows
Yi-Zhong Fan
We discuss the current interpretations of the {\it Swift} GRB X-ray afterglows, mainly focusing on the sharp decline at the prompt tail emission, and the shallow decay afterward, w…
The X-ray afterglow flat segment in short GRB 051221A: Energy injection from a millisecond magnetar?
Yizhong Fan, Dong Xu
The flat segment lasting seconds in the X-ray afterglow of GRB051221A represents the first clear case of strong energy injection in the external shock of a short GRB af…
The Interpretation and Implication of the Afterglow of GRB 060218
Yi-Zhong Fan, Tsvi Piran, Dong Xu
The nearby GRB 060216/SN 2006aj was an extremely long, weak and very soft GRB. It was peculiar in many aspects. We show here that the X-ray, ultraviolet/optical and radio afterglow…
Sub-GeV flashes in ray burst afterglows as probes of underlying bright UV flares
Yizhong Fan, Tsvi Piran
Bright optical and X-ray flares have been observed in many Gamma-ray Burst (GRB) afterglows. These flares have been attributed to late activity of the central engine. In most cases…
GRB efficiency and Possible Physical Processes Shaping the Early Afterglow
Yizhong Fan, Tsvi Piran
The discovery by Swift that a good fraction of Gamma Ray Bursts (GRBs) have a slowly decaying X-ray afterglow phase led to the suggestion that energy injection into the blast wave…