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Helium in natal HII regions: the origin of the X-ray absorption in gamma-ray burst afterglows
Darach Watson, Tayyaba Zafar, Anja C. Andersen +8
Soft X-ray absorption in excess of Galactic is observed in the afterglows of most gamma-ray bursts (GRBs), but the correct solution to its origin has not been arrived at after more…
Multiwavelength observations of GRB 110731A: GeV emission from onset to afterglow
LAT Collaboration, GBM Collaboration, Swift Collaboration +2
We report on the multiwavelength observations of the bright, long gamma-ray burst \GRB, by the \Fermi and \Swift observatories, and by the MOA and GROND optical telescopes. The ana…
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 100219A with X-shooter - abundances in a galaxy at z = 4.7
C. C. Thoene, J. P. U. Fynbo, P. Goldoni +24
Abundances of galaxies at redshifts z > 4 are difficult to obtain from damped Ly α (DLA) systems in the sightlines of quasars (QSOs) due to the Ly α forest blanketing and the low n…
Multi-color observations of short GRB afterglows: 20 events observed between 2007 and 2010
A. Nicuesa Guelbenzu, S. Klose, J. Greiner +18
We report on follow-up observations of 20 short-duration gamma-ray bursts performed in g'r'i'z'JHKs with the seven-channel imager GROND between mid-2007 and the end of 2010. This i…
The properties of the 2175AA extinction feature discovered in GRB afterglows
Tayyaba Zafar, Darach Watson, Ardis Eliasdottir +10
The unequivocal, spectroscopic detection of the 2175 bump in extinction curves outside the Local Group is rare. To date, the properties of the bump have been examined in only two G…
The optically unbiased GRB host (TOUGH) survey. V. VLT/X-shooter emission-line redshifts for Swift GRBs at z~2
Thomas Krühler, Daniele Malesani, Bo Milvang-Jensen +7
We present simultaneous optical and near-infrared (NIR) spectroscopy of 19 Swift GRB host galaxies with VLT/X-shooter with the aim of measuring their redshifts. Galaxies were selec…
The optically unbiased GRB host (TOUGH) survey. I. Survey design and catalogs
Jens Hjorth, Daniele Malesani, Páll Jakobsson +11
Long-duration gamma-ray bursts (GRBs) are powerful tracers of star-forming galaxies. We have defined a homogeneous subsample of 69 Swift GRB-selected galaxies spanning a very wide…
The metal-enriched host of an energetic gamma-ray burst at z ~ 1.6
T. Krühler, J. P. U. Fynbo, S. Geier +7
(Abridged) Long gamma-ray burst (GRB) host galaxies might open a short-cut to the characteristics of typical star-forming galaxies throughout the history of the Universe. Due to th…
A deep search for the host galaxies of GRBs with no detected optical afterglow
A. Rossi, S. Klose, P. Ferrero +28
Gamma-Ray Bursts can provide information about star formation at high redshifts. Even in the absence of a optical/near-infrared/radio afterglow, the high detection rate of X-ray af…
The late-time afterglow of the extremely energetic short burst GRB 090510 revisited
A. Nicuesa Guelbenzu, S. Klose, T. Kruehler +16
The discovery of the short GRB 090510 has raised considerable attention mainly because it had a bright optical afterglow and it is among the most energetic events detected so far w…
First simultaneous optical/near-infrared imaging of an X-ray selected, high-redshift cluster of galaxies with GROND: the galaxy population of XMMU J0338.7+0030 at z=1.1
D. Pierini, R. Suhada, R. Fassbender +28
The XMM-Newton Distant Cluster Project is a serendipitous survey for clusters of galaxies at redshifts z>=0.8 based on deep archival XMM-Newton observations. ... Low-significance c…