548 datasets found

We report the detections of molecular hydrogen (H_2_), vibrationally-excited H_2_ (H_2_), and neutral atomic carbon (CI), an efficient tracer of molecular gas, in two new...

The mechanisms producing fast variability of the {gamma}-ray emission in active galactic nuclei (AGNs) are under debate. The MAGIC telescopes detected a fast, very-high-energy...

Knowledge of the bulk Lorentz factor {Gamma}0 of gamma-ray bursts (GRBs) allows us to compute their comoving frame properties shedding light on their physics. Upon collisions...

We have collected the most complete multi-wavelength (6.0-6.0E^-18^cm) dataset of very high energy (VHE) gamma-ray emitting (TeV) BL Lacs, which are the most numerous...

We reveal multiple components of an interacting galaxy system at z~3.35 through a detailed analysis of the exquisite high-resolution Keck/HIRES spectrum of the afterglow of a...

We present the spectroscopic and photometric late-time follow-up of the host galaxy of the long-duration Swift {gamma}-ray burst GRB140506A at z=0.889. The optical and...

We perform an extensive multi-band variability and correlation study of the TeV blazar Mrk 421 on year time scales, which can bring additional insight on the processes...

Timing analysis can be a powerful tool for shading light on the still obscure emission physics and geometry of the prompt emission of gamma-ray bursts (GRBs). Fourier power...

The reionisation of the Universe is a process that is thought to have ended around z~6, as inferred from spectroscopy of distant bright background sources, such as quasars (QSO)...

Gamma-ray burst (GRB) afterglows probe sightlines to star-forming regions in distant star-forming galaxies. Here we present a study of the peculiar afterglow spectrum of the...

We present optical and near-infrared (NIR) photometry for three gamma-ray burst supernovae (GRB-SNe): GRB 120729A, GRB 130215A/SN 2013ez and GRB 130831A/SN 2013fu. For GRB...

We present a study of the environment of the Swift long gamma-ray burst GRB 120327A at z~2.8 through optical spectroscopy of its afterglow. We analyzed medium-resolution,...

With the afterglow of GRB 100621A being the brightest detected so far in X-rays, and superb GROND coverage in the optical/near-infrared during the first few hours, an...

We present the discovery of molecular hydrogen (H_2_), including the presence of vibrationally-excited H_2^*^_ in the optical spectrum of the afterglow of GRB 120815A at z=2.36...

Multiwavelength (MWL) observations of the blazar PKS 2155-304 during two weeks in July and August 2006, the period when two exceptional flares at very high energies (VHE,...

Massive protostars have associated bipolar outflows that can produce strong shocks when they interact with the surrounding medium. At these shocks, particles can be accelerated...

We present the results of the spectral analysis of the public data of 438 gamma ray bursts (GRBs) detected by the Fermi Gamma ray Burst Monitor (GBM) up to March 2010. For 432...

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We analyzed the data obtained by the SPI telescope onboard the INTEGRAL observatory to search for short transient events with a duration from 1 ms to a few tens of seconds. An...

The short duration (T90<2s) gamma-ray bursts (GRBs) detected in the SPI-ACS experiment onboard the INTEGRAL observatory are investigated. Averaged light curves have been...