Rol2006 GRB 050716余辉的长时间观测 2

主要内容:
给出了GRB050716长达10^6秒的余辉观测，包括光变和谱。

精彩摘抄:

长达1000，000秒的X射线观测
前1000秒的观测


文章信息:

astro-ph/0611554 [abs, ps, pdf, other] :

Title: The early and late-time spectral and temporal evolution of GRB 050716
Authors: E. Rol (1), J. P. Osborne (1), K. L. Page (1), K. E. McGowan (2), A. P. Beardmore (1), P. T .O'Brien (1), A. J. Levan (3), D. Bersier (4,5), C. Guidorzi (5,6), F. Marshall (7), A. S. Fruchter (4), N. R. Tanvir (1,3), A. Monfardini (5), A. Gomboc (5,8), S. Barthelmy (7), N. P. Bannister (1) (1. U. of Leicester, 2. U. of Southampton, 3. U. of Hertfordshire, 4. STScI, 5. Liverpool JMU, 6. Brera Obs., 7. GSFC, 8. U. of Ljubljana)
Comments: Accepted to MNRAS. 8 pages, 5 figures

We report on a comprehensive set of observations of Gamma Ray Burst 050716, detected by the Swift satellite and subsequently followed-up rapidly in X-ray, optical and near infra-red wavebands. The prompt emission is typical of long-duration bursts, with two peaks in a time interval of T90 = 68 seconds (15 - 350 keV). The prompt emission continues at lower flux levels in the X-ray band, where several smaller flares can be seen, on top of a decaying light curve that exhibits an apparent break around 220 seconds post trigger. This temporal break is roughly coincident with a spectral break. The latter can be related to the extrapolated evolution of the break energy in the prompt gamma-ray emission, and is possibly the manifestation of the peak flux break frequency of the internal shock passing through the observing band. A possible 3 sigma change in the X-ray absorption column is also seen during this time. The late-time afterglow behaviour is relatively standard, with an electron distribution power-law index of p = 2 there is no noticable temporal break out to at least 10 days. The broad-band optical/nIR to X-ray spectrum indicates a redshift of z ~> 2 for this burst, with a host-galaxy extinction value of E(B-V) ~ 0.7 that prefers an SMC-like extinction curve.