Volume 393, Number 1, October I 2002
|Page(s)||L1 - L5|
|Published online||18 September 2002|
Letter to the Editor
The X-ray afterglows of gamma-ray bursts GRB 001025A and GRB 010220 observed with XMM-Newton
X-ray Astronomy Group, Dept. of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
2 XMM-Newton Operations Centre, European Space Agency, Vilspa, Apartado 50727, 28080 Madrid, Spain
Corresponding author: D. Watson, firstname.lastname@example.org
Accepted: 2 August 2002
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 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 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.
Key words: gamma rays: bursts / supernovae: general / X-rays: general
© ESO, 2002
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