La Parola, V;
La Parola, V;
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GRB 070318: A case of prompt emission from the external shock?
(pp. pp. 421-424).
The prompt emission of gamma-ray bursts (GRBs) is generally thought to be produced by internal shocks within the relativistic outflow, while the longer-wavelength afterglow is produced by external shocks resulting from the interaction between the outflow and external medium. This picture has gained support from the clear separation between the prompt and afterglow phases seen in most Swift GRBs. However, no separation is seen in GRB 070318. The prompt X-ray emission extrapolated from the observed Swift BAT flux matches well the early X-ray afterglow emission in both temporal and spectral properties, and the combined 0.3-10 keV light curve can be fit with a single power-law with an index typical of late-time afterglows. The UV-optical light curve displays a similar power-law decay after the broad maximum. In addition, the gamma-ray emission displays a single, FRED(fast rise, exponential decay)-like peak and unusually smooth light curve, consistent with a single impulsive event interacting with the external medium. © 2008 American Institute of Physics.
|Title:||GRB 070318: A case of prompt emission from the external shock?|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics
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