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Scattering by interstellar dust grains can produce time variable X-ray halosaround gamma-ray bursts (GRB). In particular, an X-ray expanding ring isexpected when a short pulse of X-ray radiation is scattered by a narrow layerof dust in our Galaxy. We present a new method to detect and analyze dustscattering expanding rings around gamma-ray bursts, using as an exampleXMM-Newton data of GRB 031203. Consistent with previous reports (Vaughan et al.2004), we find that the two expanding rings observed in this burst are due todust unevenly distributed in two layers at distances of 870 and 1384 pc, withthe more distant one responsible for 70% of the total optical depth. Ourmodelling of the rings indicates that the prompt X-ray emission of GRB 031203was consistent with a power law spectrum with photon index $\Gamma$=2.1$\pm$0.2and 1-2 keV fluence of (3.6$\pm$0.2)$\times10^{-7}$ erg cm$^{-2}$. Thanks tothe sensitivity of our technique, we discovered an expanding ring aroundanother burst recently observed with XMM-Newton, GRB 050713A. In this case thedust layer is located at a distance of 364 pc and we derive a GRB fluence of(1.2$\pm$0.3)$\times10^{-7}$ erg cm$^{-2}$ (1-2 keV). A search for similarhalos in other twelve bursts observed with XMM-Newton gave negative results.Comment: 7 pages, 7 figures, A&A accepte

Dust-scattered X-ray halos around gamma-ray bursts: GRB 031203 revisited and the new case of GRB 050713A