Issue |
A&A
Volume 393, Number 1, October I 2002
|
|
---|---|---|
Page(s) | L1 - L5 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:20021132 | |
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
1
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, wat@star.le.ac.uk
Received:
18
June
2002
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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