The number of long gamma-ray bursts (GRBs) known to have occurred in the distant Universe (z > 5) is small (̃15); however, these events provide a powerful way of probing star formation at the onset of galaxy evolution. In this paper, we present …
Aims: With this paper we want to investigate the highly variable afterglow light curve and environment of gamma-ray burst (GRB) 060526 at z = 3.221. Methods: We present one of the largest photometric datasets ever obtained for a GRB afterglow, …
In this paper, Figure 14 is incomplete due to an error during production. We here provide the missing sub-figures. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile, under …
We present a sample of 77 optical afterglows (OAs) of Swift detected gamma-ray bursts (GRBs) for which spectroscopic follow-up observations have been secured. Our first objective is to measure the redshifts of the bursts. For the majority (90%) of …
In this work, we present the first results of our imaging campaign at Keck Observatory to identify the host galaxies of ``dark'' gamma-ray bursts (GRBs), events with no detected optical afterglow or with detected optical flux significantly fainter …
The first gamma-ray burst (GRB) confirmed to be bright enough to be seen with the naked eye, GRB 080319B at redshift z = 0.937, allowed for exquisite follow-up observations across the electromagnetic spectrum. We present our detailed optical and …
We report the discovery of a transient source in the central regions of galaxy cluster A267. The object, which we call ``PALS-1,`` was found in a survey aimed at identifying highly magnified Lyman break galaxies in the fields of intervening rich …
We present early-time Keck spectroscopic observations and late-time Hubble Space Telescope (HST) imaging of GRB 000926. The HST images show a small offset between the optical transient and a bright, compact knot in the host galaxy. Combined with the …
We present radio observations of the afterglow of the bright γ-ray burst GRB 980329 made between 1 month and several years after the burst, a reanalysis of previously published submillimeter data, and late-time optical and near- infrared (NIR) …
Of all the well-localized gamma-ray bursts, GRB 000911 has the longest duration (T$_90$=500 s) and ranks in the top 1% of BATSE bursts for fluence. Here we report the discovery of the afterglow of this unique burst. In order to simultaneously fit our …