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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…
Searching for galactic sources in the Swift GRB catalog
J. C. Tello, A. J. Castro-Tirado, J. Gorosabel +6
Since the early 1990s Gamma Ray Bursts have been accepted to be of extra-galactic origin due to the isotropic distribution observed by BATSE and the redshifts observed via absorpti…
Illuminating the Darkest Gamma-Ray Bursts with Radio Observations
B. A. Zauderer, E. Berger, R. Margutti +15
We present X-ray, optical, near-infrared, and radio observations of GRBs 110709B and 111215A, as well as optical and near-IR observations of their host galaxies. The combination of…
The distribution of equivalent widths in long GRB afterglow spectra
A. de Ugarte Postigo, J. P. U. Fynbo, C. C. Thoene +11
The extreme brightness of gamma-ray burst (GRB) afterglows and their simple spectral shape make them ideal beacons to study the interstellar medium of their host galaxies through a…
TOUGH: Observational aspects of gamma-ray burst host galaxies
Jens Hjorth, Daniele Malesani, Andreas O. Jaunsen +11
GRB-selected galaxies are broadly known to be faint, blue, young, star-forming dwarf galaxies. This insight, however, is based in part on heterogeneous samples of optically selecte…
Comprehensive multi-wavelength modelling of the afterglow of GRB050525A
L. Resmi, K. Misra, G. Jóhannesson +13
The Swift era has posed a challenge to the standard blast-wave model of Gamma Ray Burst (GRB) afterglows. The key observational features expected within the model are rarely observ…
GRB100814A as a member of the growing set of bursts with sudden optical rebrightening
Massimiliano De Pasquale, N. P. Kuin, S. Oates +22
We present the gamma-ray, X-ray, optical and radio data for GRB100814A. At the end of the slow decline phase of the X-ray and optical afterglow, a sudden and prominent rebrightenin…
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…
Identifying the Location in the Host Galaxy of the Short GRB 111117A with the Chandra Sub-arcsecond Position
T. Sakamoto, E. Troja, K. Aoki +31
We present our successful Chandra program designed to identify, with sub-arcsecond accuracy, the X-ray afterglow of the short GRB 111117A, which was discovered by Swift and Fermi.…
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…
Detailed optical and near-infrared polarimetry, spectroscopy and broadband photometry of the afterglow of GRB 091018: Polarisation evolution
K. Wiersema, P. A. Curran, T. Kruehler +30
[Abridged] A number of phenomena have been observed in GRB afterglows that defy explanation by simple versions of the standard fireball model, leading to a variety of new models. P…
BOOTES Observation of GRB 080603B
Martin Jelinek, Javier Gorosabel, Alberto J. Castro-Tirado +9
We report on multicolor photometry of long GRB080603B afterglow from BOOTES-1B and BOOTES-2. The optical afterglow has already been reported to present a break in the optical light…
The shallow-decay phase in both optical and x-ray afterglows of Swift GRB 090529A: Energy injection into a wind-type medium?
L. P. Xin, A. Pozanenko, D. A. Kann +22
The energy injection model is usually proposed to interpret the shallow-decay phase in Swift GRB X-ray afterglows. However, very few GRBs have simultaneous signatures of energy inj…
SN 2006oz: rise of a super-luminous supernova observed by the SDSS-II SN Survey
G. Leloudas, E. Chatzopoulos, B. Dilday +21
We study SN 2006oz, a newly-recognized member of the class of H-poor, super-luminous supernovae. We present multi-color light curves from the SDSS-II SN Survey, that cover the rise…