Journal
ASTRONOMY & ASTROPHYSICS
Volume 415, Issue 2, Pages 443-450Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20034626
Keywords
gamma rays : bursts; line : formation; radiation mechanisms : general
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We reanalyze the XMM-Newton data of GRB 011211 showing that the spectral features, interpreted by Reeves et al. (2002, 2003) as due to thermal emission from a collisionally ionized plasma, can be also reproduced by a reflection model (with ionization parameter xisimilar to10(2)). We discuss the implications of this interpretation, estimating the total mass required in the simplified case of a funnel geometry. We conclude that a moderate clumping of the reprocessing material (corresponding to a filling factor of the order of fsimilar to10(-3)) is required. Finally we show that, if this interpretation is correct, a bright quasi-thermal component is expected in the optical-UV band (containing about 90% of the luminosity of the illuminating continuum), whose presence can be used to test the reflection model.
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