SIMBAD references

2015ApJ...803...10T - Astrophys. J., 803, 10 (2015/April-2)

Swift and Fermi observations of X-ray flares: the case of late internal shock.

TROJA E., PIRO L., VASILEIOU V., OMODEI N., BURGESS J.M., CUTINI S., CONNAUGHTON V. and McENERY J.E.

Abstract (from CDS):

Simultaneous Swift and Fermi observations of gamma-ray bursts (GRBs) offer a unique broadband view of their afterglow emission, spanning more than 10 decades in energy. We present the sample of X-ray flares observed by both Swift and Fermi during the first three years of Fermi operations. While bright in the X-ray band, X-ray flares are often undetected at lower (optical), and higher (MeV to GeV) energies. We show that this disfavors synchrotron self-Compton processes as the origin of the observed X-ray emission. We compare the broadband properties of X-ray flares with the standard late internal shock model, and find that in this scenario, X-ray flares can be produced by a late-time relativistic (Γ > 50) outflow at radii R ∼ 1013-1014 cm. This conclusion holds only if the variability timescale is significantly shorter than the observed flare duration, and implies that X-ray flares can directly probe the activity of the GRB central engine.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: general - radiation mechanisms: non-thermal

Simbad objects: 15

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2020.02.22-05:44:54

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