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Dust-to-metal ratios in damped Lyman-alpha absorbers: Fresh clues to the origins of dust and optical extinction towards gamma-ray bursts
A. De Cia, C. Ledoux, S. Savaglio +2
Motivated by the anomalous dust-to-metal ratios derived in the literature for gamma-ray burst (GRB) damped Lyman-alpha absorbers (DLAs), we measure these ratios using the dust-depl…
Molecular Hydrogen in the Damped Lyman-alpha System towards GRB 120815A at z=2.36
T. Krühler, C. Ledoux, J. P. U. Fynbo +32
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 obtain…
Time-dependent excitation and ionization modelling of absorption-line variability due to GRB 080310
P. M. Vreeswijk, C. Ledoux, A. J. J. Raassen +6
We model the time-variable absorption of FeII, FeIII, SiII, CII and CrII detected in UVES spectra of GRB 080310, with the afterglow radiation exciting and ionizing the interstellar…
Rapid-response mode VLT/UVES spectroscopy of super iron-rich gas exposed to GRB 080310. Evidence of ionization in action and episodic star formation in the host
A. De Cia, C. Ledoux, A. J. Fox +7
We analyse high-resolution near-UV and optical spectra of the afterglow of GRB 080310, obtained with the Very Large Telescope Ultraviolet and Visual Echelle Spectrograph (VLT/UVES)…
Galaxy counterparts of intervening high-z sub-DLAs/DLAs and MgII absorbers towards gamma-ray bursts
S. Schulze, J. P. U. Fynbo, B. Milvang-Jensen +19
We present the first search for galaxy counterparts of intervening high-z (2<z< 3.6) sub-DLAs and DLAs towards GRBs. Our final sample comprises of five intervening sub-DLAs and DLA…
GRB 070125 and the environments of spectral-line poor afterglow absorbers
A. De Cia, R. L. C. Starling, K. Wiersema +9
GRB 070125 is among the most energetic bursts detected and the most extensively observed so far. Nevertheless, unresolved issues are still open in the literature on the physics of…
Low-Resolution Spectroscopy of Gamma-ray Burst Optical Afterglows: Biases in the Swift Sample and Characterization of the Absorbers
J. P. U. Fynbo, P. Jakobsson, J. X. Prochaska +39
(Abridged). We present a sample of 77 optical afterglows (OAs) of Swift detected GRBs for which spectroscopic follow-up observations have been secured. We provide linelists and equ…