218 citations · 820 across the 13 of their papers we have counts for
13 papers
Gamma-Ray Burst Host Galaxies: Specific Star Formation Rate vs. Metallicity
Gunnlaugur Björnsson
The observed properties of long gamma-ray burst (GRB) host galaxies show them to often be of a rather low metallicity and/or of high specific star formation rate (SFR). It is not c…
Low-energy electrons in GRB afterglow models
Guðlaugur Jóhannesson, Gunnlaugur Björnsson
Observations of gamma-ray burst (GRB) afterglows have long provided the most detailed information about the origin of this spectacular phenomena. The model that is most commonly us…
Probing GRB environments with time variability: ULTRASPEC fast imaging of GRB 080210
A. De Cia, P. Jakobsson, G. Björnsson +12
We present high time resolution (1.09 s) photometry of GRB 080210 obtained with ULTRASPEC mounted on the ESO/3.6-m telescope, starting 68.22 min after the burst and lasting for 26.…
Afterglow Light Curves and Broken Power Laws: A Statistical Study
Gudlaugur Jóhannesson, Gunnlaugur Björnsson, Einar H. Gudmundsson
In gamma-ray burst research it is quite common to fit the afterglow light curves with a broken power law to interpret the data. We apply this method to a computer simulated populat…
The GRB 030329 host: a blue low metallicity subluminous galaxy with intense star formation
J. Gorosabel, D. Pérez-Ramírez, J. Sollerman +13
We present broad band photometry and spectroscopic observations of the host galaxy of GRB 030329. Analysis of the spectral emission lines shows that the host is likely a low metall…
Swift Identification of Dark Gamma-Ray Bursts
P. Jakobsson, J. Hjorth, J. P. U. Fynbo +4
We present an optical flux vs. X-ray flux diagram for all known gamma-ray bursts (GRBs) for which an X-ray afterglow has been detected. We propose an operational definition of dark…