GRB 031203: A low luminosity X-ray flash with a Galactic halo

Details GRB 031203: A low luminosity X-ray flash with a Galactic halo GRB 031203: A low luminosity X-ray flash with a Galactic halo

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.2202o&link_type=abstract

American Astronomical Society, HEAD meeting #8, #22.02; Bulletin of the American Astronomical Society, Vol. 36, p.947

Astronomy and Astrophysics

Astronomy

Scientific paper

XMM-Newton observations of GRB 031203 revealed apparently expanding X-ray rings centered on the afterglow. These beautiful and unique concentric halos were due to scattering by dust in our Galaxy of soft X-ray emission within an hour of the burst. It is natural to associate this emission with the GRB, leading us to identify this as a very soft X-ray flash. The low redshift of 0.105 leads to a very low isotropic energy, intermediate between that of GRB 980425 and the values of more typical GRBs. The Amati and Atteia relationships result in a redshift and Epeak consistent with the observed values, demonstrating that this GRB/XRF, although unusually soft, close and low luminosity, follows some normal GRB patterns. However, the low luminosity and unusual fast-then-slow X-ray decay behaviour hint at large jet opening and viewing angles.

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