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

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作者：
Tiengo, A. [1 ,2 ]
Mereghetti, S. [1 ]
机构：
[1] INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, via Bassini 15, 20133 Milano, Italy
[2] Dipartimento di Fisica, Università Degli Studi di Milano, via Celoria 16, 20133 Milano, Italy
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Astronomy and Astrophysics | 1600年 / 449卷 / 01期
关键词：
Scattering by interstellar dust grains can produce time variable X-ray halos around gamma-ray bursts (GRB). In particular; an X-ray expanding ring is expected when a short pulse of X-ray radiation is scattered by a narrow layer of dust in our Galaxy. We present a new method for detecting and analyzing dust-scattering expanding rings around gamma-ray bursts; using as an example the XMM-Newton data of GRB 031203. Consistent with previous reports; we found that the two expanding rings observed in this burst are due to dust unevenly distributed in two layers at distances of 870 and 1384 pc; with the more distant one responsible for 70% of the total optical depth. Our modelling of the rings indicates that the prompt X-ray emission of GRB 031203 was consistent with a power law spectrum with photon index Γ = 2.1 ± 0.2 and 1-2 keV fluence of (3.6 ± 0.2) × 10-7 erg cm-2. Thanks to the sensitivity of our technique; we discovered an expanding ring around another burst recently observed with XMM-Newton; GRB 050713A. In this case the dust layer is located at a distance of 364 pc; and we derived a GRB fluence of (1.2 ± 0.3) × 10-7 erg cm-2 (1-2 keV). A search for similar halos in twelve other bursts observed with XMM-Newton gave negative results. © ESO 2006;
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页码：203 / 209
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