XMM-Newton Observations of GRB Afterglows

Details XMM-Newton Observations of GRB Afterglows XMM-Newton Observations of GRB Afterglows

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..312..181r&link_type=abstract

Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era ASP Conference Series, Volume 312, Proceedings of the conference he

Astronomy and Astrophysics

Astronomy

Scientific paper

The properties of all 4 GRB X-ray afterglows, observed to date with XMM-Newton, are presented. GRB 011211, GRB010220 and GRB 001025A all appear to show X-ray line emission features, whilst a fourth, GRB 020322, shows soft X-ray absorption. The line emission from GRB 011211, observed at 11 hours after the initial burst, appears to decay with time, the rest-energies of the lines indicate an outflow of ˜0.1 c, implying a moderate (days/weeks) time delay between any supernova event and the burst itself. The X-ray spectrum of GRB01025A exhibits a soft excess, which may also be attributable to a blend of emission lines. Overall the observations are supportive of stellar collapse models for GRBs, implying that long GRBs occur in a rich, high density environment.

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