Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-15
Astron.Astrophys. 395 (2002) L41
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, accepted for publication in A&A Letters
Scientific paper
10.1051/0004-6361:20021501
The spectrum of the afterglow of GRB 020322 is the highest-quality X-ray spectrum of a GRB afterglow available to date. It was detected by XMM-Newton in an observation starting fifteen hours after the GRB with a mean 0.2--10.0 keV observed flux of 3.5+/-0.2x10^-13 erg cm^-2 s^-1, making it the brightest X-ray afterglow observed so far with XMM-Newton. The source faded; its lightcurve was well fit by a power-law with a decay index of 1.26+/-0.23. The spectrum is adequately fit with a power-law absorbed with neutral or ionised gas significantly in excess of the foreground Galactic column, at redshift 1.8_{-1.1}^{+1.0} or with low metal abundances. No spectral line or edge features are detected at high significance, in particular, a thermal emission model fits the data poorly, the upper limit on its contribution to the spectrum is 3.7x10^-14 erg cm^-2 s^-1, or at most ~10% of the total flux. No spectral variability is observed.
Ehle Matthias
O'Brien Thomas P.
Osborne Julian Paul
Reeves James N.
Tedds Jonathan A.
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