Gamma-ray bursts (GRBs) are sudden, intense flashes of gamma rays that, for a few
blinding seconds, light up in an otherwise fairly dark gamma-ray sky. They are detected at …

Gamma-ray bursts are the most luminous explosions in the Universe, and their origin and
mechanism are the focus of intense research and debate. More than three decades after …

We present new observations of the early X-ray afterglows of the first 27 gamma-ray bursts
(GRBs) well observed by the Swift X-Ray Telescope (XRT). The early X-ray afterglows show …

Swift has now completed 18 years of mission, during which it discovered thousands of
gamma-ray bursts as well as new classes of high-energy transient phenomena. Its first …

We extend our calculation of physical parameters of gamma-ray burst (GRB) jets by
modeling the broadband emission of the afterglows 970508, 980519, 991208, 000926 …

The gamma-ray burst (GRB) 050904 at provides the first opportunity to probe the
intergalactic medium (IGM) by GRBs at the epoch of reionization. Here, we present a …

We show a possible way to measure the column density of free electrons along the light
path, the so-called dispersion measure (DM), from the early [∼ 415 (ν/1 GHz)-2 (DM/10 5 pc …

We present a detailed analysis of Swift multiwavelength observations of GRB 070110 and its
remarkable afterglow. The early X-ray light curve, interpreted as the tail of the prompt …

Context. Thirteen years after the discovery of the first afterglows, the nature of dark gamma-
ray bursts (GRB) still eludes explanation: while each long-duration GRB typically has an X …

We present K-band imaging observations of ten gamma-ray burst (GRB) host galaxies for
which an optical and/or radio afterglow associated with the GRB event was clearly identified …