Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sgrb.confe..53r&link_type=abstract
Presented at the KITP Conference: Supernova and Gamma-Ray Burst Remnants, Feb 6, 2006, Kavli Institute for Theoretical Physics,
Physics
Scientific paper
The evidence for X-ray line emission in GRB afterglows isreviewed. Evidence from XMM-Newton observations of GRB afterglows hasshowed moderate statistical significance soft X-ray lines in at least 3 GRBafterglows, GRB 011211, GRB 030227 and GRB 040106. Blue-shifted soft X-raylines from Si, S, Ar were originally claimed in GRB 011211, which wasinterpreted as emission from hot, outflowing gas around the GRBprogenitor, possibly originating from a supernova explosion. Thestatistical significance of the line features. e.g. through Monte Carlosimulations, will be addressed. Preliminary results from the afterglowspectra provided by Swift XRT will also be presented. A small number ofthese afterglows may show evidence for a soft X-ray excess, while a largeproportion show excess X-ray absorption. None of the afterglows appear toshow evidence for Fe line emission, in contrast with very early afterglowspectra obtained by Beppo-SAX, ASCA and Chandra, but in agreement with theXMM-Newton observations. The potential for detecting X-ray line features athigher statistical significance will be discussed.
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