Query : 2002A&A...389L..74B

2002A&A...389L..74B - Astronomy and Astrophysics, volume 389, L74-77 (2002/7-3)

X-ray spectral diagnostics of the immediate environment of GRB 991216.


Abstract (from CDS):

The recent report of iron line features in the afterglow of the gamma-ray burst (GRB) 991216 has important implications for the properties of the radiating material and hence the nature of the immediate burst environment. We argue that the putative strong Fe emission line can be attributed to the reflected emission from Thomson-thick matter which is illuminated by a power-law continuum. The ionization parameter of the material (i.e., the flux to density ratio) is around 103, resulting in a Fe Kα line from He-like iron. A supersolar abundance of iron is not required by the data. Interestingly, the ionizing continuum must be harder than the observed one. We interpret this as due to the fact that the observed continuum is dominated by the standard blast wave emission, while the line is produced by reprocessing material located at much smaller radii.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - X-rays: general - radiation mechanisms: non-thermal - line: formation

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 GRB 970228 gB 05 01 46.7 +11 46 53           ~ 637 1
2 GRB 991216 gB 05 09 31.2983 +11 17 07.262           ~ 420 0
3 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 866 1
4 GRB 000214 gB 18 54 27.0 -66 27 30           ~ 90 0

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