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Issue A&A
Volume 393, Number 1, October I 2002
Page(s) L1 - L5
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20021132



A&A 393, L1-L5 (2002)
DOI: 10.1051/0004-6361:20021132

Letter

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

D. Watson1, J. N. Reeves1, J. Osborne1, P. T. O'Brien1, K. A. Pounds1, J. A. Tedds1, M. Santos-Lleó2 and M. Ehle2

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

(Received 18 June 2002 / Accepted 2 August 2002 )

Abstract
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 $3.3\times10^{-14}$ 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.


Key words: gamma rays: bursts -- supernovae: general -- X-rays: general

Offprint request: D. Watson, wat@star.le.ac.uk

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© ESO 2002


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