Properties of X-ray rich gamma ray bursts and X-ray flashes detected with BeppoSAX and Hete-2
Abstract
We study the spectrum of the prompt emission and the X-ray and optical afterglow fluxes of 54 X-Ray Rich Gamma Ray Burst (XRRs) and X-Ray Flashes (XRFs), observed by BeppoSAX and HETE-2. A comparison is then performed with classical Gamma Ray Bursts (GRBs). The goal of this paper is to investigate the nature of XRRs/XRFs, as high redshift GRBs or off-axis GRBs, analyzing both their prompt and afterglow properties. We find that the XRR/XRF spectral indexes of the Band function are similar to those of classical GRBs, whereas the peak energy is lower by a factor of 4. We study the optical and X-Ray afterglow properties of the XRRs/XRFs; in particular we analyze the
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 2006
- DOI:
- 10.1051/0004-6361:20054501
- arXiv:
- arXiv:astro-ph/0511272
- Bibcode:
- 2006A&A...460..653D
- Keywords:
-
- X-rays: general;
- gamma rays: bursts;
- Astrophysics
- E-Print:
- 18 pages, 12 color figures, 1 b/w figures, accepted to Astronomy and Astrophysics