منابع مشابه
Phases of Swift X-ray Afterglows
The X-ray afterglows observed by Swift exhibit rich light-curves, with four phases of different decay rate. The temporal and spectral properties for a set of 47 bursts are used to identify the mechanisms which can explain these four phases. The early, fast-decaying phase can be attributed to the same mechanism which generated the burst emission (internal shocks in a relativistic outflow), while...
متن کاملGLAST Prospects for Swift-Era Afterglows
We calculate the GeV spectra of GRB afterglows produced by inverse Compton scattering of the sub-MeV emission of these objects. We improve on earlier treatments by using refined afterglow parameters and new model developments motivated by recent Swift observations. We present time-dependent GeV spectra for standard, constant parameter models, as well as for models with energy injection and with...
متن کاملOptical/UV afterglows: Swift UVOT overview.
The ultraviolet and optical telescope (UVOT) on Swift provides coverage of gamma-ray bursts and their afterglows in the 170-650 nm band, yielding multiwavelength data of considerable diagnostic power in conjunction with the Swift X-ray Telescope. The results from the first eighteen months of operation show a broad range of afterglow behaviour, with considerably more complexity in many bursts th...
متن کاملEvidence for intrinsic absorption in the Swift X–ray afterglows
Gamma-ray burst (GRB) progenitors are observationally linked to the death of massive stars. X–ray studies of the GRB afterglows can deepen our knowledge of the ionization status and metal abundances of the matter in the GRB environment. Moreover, the presence of local matter can be inferred through its fingerprints in the X–ray spectrum, i.e. the presence of absorption higher than the Galactic ...
متن کاملSwift GRB Afterglows and the Forward-Shock Model
The X-ray light-curves of the GRB afterglows monitored by Swift display one to four phases of power-law decay. In chronological order they are: the burst tail, the ”hump”, the standard decay, and the post jet-break decay. More than half of GRB tails can be identified with the large-angle emission produced during the burst, but arriving at observer later. Several afterglows exhibit a slow, unbro...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Comptes Rendus Physique
سال: 2011
ISSN: 1631-0705
DOI: 10.1016/j.crhy.2011.04.002