We have gathered optical photometry data from the literature on a large sample of Swift-era
gamma-ray burst (GRB) afterglows including GRBs up to 2009 September, for a total of 76 …

The intrinsic X-ray emission of gamma-ray bursts (GRBs) is often found to be absorbed over
and above the column density through our own Galaxy. The extra component is usually …

Aims. The aim of this paper is to study the environment and intervening absorbers of the
gamma-ray burst GRB 090926A through analyzing optical spectra of its afterglow. Methods …

Quasars (Quasi Stellar Objects, abbreviated as QSOs) are still nowadays, close to half a
century after their discovery, objects which are not completel y understood. In this brief …

We examine a sample of 2301 gamma-ray bursts, detected by Konus-Wind in the triggered
mode between 1994 and 2017 and localized by the interplanetary network (IPN), for …

Aims. We analyse the distribution of matter around the progenitor star of gamma-ray burst
GRB 021004 and the properties of its host galaxy with high-resolution echelle and near …

We present the catalogue of the Mg ii absorption systems detected at a high significance
level using an automated search algorithm in the spectra of quasars from the 12th data …

Previous studies have shown that the incidence rate of intervening strong Mg ii absorbers
towards gamma-ray bursts (GRBs) were a factor of 2–4 higher than towards quasars …

Context. X-shooter is the first second-generation instrument to become operative at the ESO
Very Large Telescope (VLT). It is a broad-band medium-resolution spectrograph designed …

We present a new determination of the dust content and near-ultraviolet/optical extinction
curves associated with a sample of≃ 8300 strong, W λ27960> 1 Å, Mg ii absorbers, redshifts …