Grupe2006 GRB060729的超长X射线余辉观测 3

主要内容:
观测到一直到100天以后的X射线余辉。还有光学和谱的观测。

精彩摘抄:
X射线的光变曲线。

文章信息:

astro-ph/0611240 [abs, ps, pdf, other] :

Title: Swift and XMM-Newton Observations of the Extraordinary GRB 060729: An afterglow with a more than 100 days X-ray light curve
Authors: Dirk Grupe (PSU), Caryl Gronwall (PSU), Xiang-Yu Wang (PSU), Peter Roming (PSU), Jay Cummings (NASA/GSFC), Bing Zhang (Univ of NV), Peter Meszaros (), Guido Chincarini (INAF-OAB), Takanori Sakamoto (NASA/GSFC), Neil Gehrels (NASA/GSFC)
Comments: Submitted to ApJ, 25 pages, 10 figures

We report the results of the Swift and XMM observations of the Swift-discovered Gamma-Ray Burst GRB 060729. The afterglow of this burst was exceptionally bright in X-rays as well as at UV/Optical wavelengths showing an unusually long slow decay phase suggesting a larger energy injection phase at early times than in other bursts. The X-ray light curve displays a break at about 50 ks after the burst. The X-ray decay slope after the break is 1.3. Up to 100 days after the burst we do not detect a jet break. In the first 2 minutes after the burst (rest frame) the X-ray spectrum of the burst changed dramatically from a hard X-ray spectrum to a very soft one. In the blackbody model we find that the temperature changes from $kT=0.6$ keV at 85 s after the burst to 0.1 keV at 160 s after the burst in the rest frame. In Swift's UV/Optical telescope the afterglow was clearly detected up to 9 days after the burst in all 6 filters and even longer in some of the UV filters with the latest detection in the UVW1 31 days after the burst. The breaks seen in the UVOT light curves appear to occur all within the errors at about 50 ks after the burst. 500 ks after the burst. In addition to the Swift observations we also present and discuss the results from a 61 ks Target-of-Opportunity observation by XMM. These observations show a typical afterglow X-ray spectrum with beta-x=1.1 and and absorption column density of $1\times 10^{21}$ cm$^{-2}$. (Abriviated)