The X-ray afterglows of gamma-ray bursts GRB 001025A and GRB 010220 observed with XMM-Newton

Details The X-ray afterglows of gamma-ray bursts GRB 001025A and GRB 010220 observed with XMM-Newton The X-ray afterglows of gamma-ray bursts GRB 001025A and GRB 010220 observed with XMM-Newton

2002-08-02

arxiv.org/abs/astro-ph/0208067v1

Astron.Astrophys. 393 (2002) L1-L6

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures; accepted for publication in A&A letters

Scientific paper

10.1051/0004-6361:20021132

The X-ray afterglows of GRB 001025A and GRB 010220 were detected by XMM-Newton with an average 0.2--10.0 keV flux of 4.4 and 3.3x10^{-14} erg cm^{-2} s^{-1} respectively; the afterglow of GRB 001025A is observed to decay. Afterglows at other wavelengths were not detected for either burst. A set of broadened soft X-ray emission lines are detected in the afterglow of GRB 001025A, at 5.0 sigma significance above a Galactic-absorbed power-law continuum. The spectra of both afterglows are significantly better fit by a variable abundance thermal plasma model than by an absorbed power-law and are consistent with the observations of GRB 011211, indicating that thermal emission from light elements may be common in the early X-ray afterglows of GRBs.

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