Vianello 2007 GRB 061019 and GRB 070129的尘埃散射

主要内容:
观测到了它们X射线的尘埃环。

精彩摘抄:


文章信息:

arXiv:0707.2343 [ps, pdf, other]

Title: Dust-scattered X-ray halos around two Swift gamma-ray bursts: GRB 061019 and GRB 070129

Authors: G.Vianello, A. Tiengo, S. Mereghetti

Comments: 6 pages, 8 figures; Submitted to Astronomy & Astrophysics

Subjects: Astrophysics (astro-ph)

Two new X-ray expanding rings were detected by the Swift XRT instrument during early follow-up observations of GRB 061019 and GRB 070129, increasing to 5 the number of dust scattering X-ray halos observed around GRBs. Although these two halos were particularly faint, a sensitive analysis can be performed optimizing for the Swift satellite the method developed by Tiengo & Mereghetti (2006) to analyze dust scattering rings observed with XMM-Newton. In the case of GRB 061019, a known giant molecular cloud is identified as the responsible for the scattering process and its distance is accurately measured (d=940 +/- 40 pc) through the dynamics of the expanding ring. In the second case, XRT observed both the main peak of the prompt emission of GRB 070129 and the scattering halo, but the small number of detected halo photons prevents us to discriminate between different dust models.