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

D. Watson·J. N. Reeves·J. Osborne·P. T. O'Brien·K. A. Pounds·J. A. Tedds·M. Santos-Lleo·M. Ehle
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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 3.3x10^{-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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D. Watson, J. N. Reeves, J. Osborne, P. T. O'Brien, K. A. Pounds, J. A. Tedds, M. Santos-Lleo, M. Ehle. 2002-08-02. The X-ray afterglows of gamma-ray bursts GRB 001025A and GRB 010220 observed with XMM-Newton. https://doi.org/10.1051/0004-6361%3A20021132

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