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Detection of the high z GRB 080913 and its implications on progenitors and energy extraction mechanisms
D. Perez-Ramirez, A. de Ugarte Postigo, J. Gorosabel +15
Aims: We present multiwavelength observations of one of the most distant gamma-ray bursts detected so far, GRB 080913. Based on these observations, we consider whether it could be…
Extensive multiband study of the X-ray rich GRB 050408. A likely off-axis event with an intense energy injection
A de Ugarte Postigo, T. A. Fatkhullin, G. Johannesson +40
Aims. Understand the shape and implications of the multiband light curve of GRB 050408, an X-ray rich (XRR) burst. Methods. We present a multiband optical light curve, covering the…
GRB 060121: Implications of a Short/Intermediate Duration Gamma-Ray Burst at High Redshift
A. de Ugarte Postigo, A. J. Castro-Tirado, S. Guziy +23
Since the discovery of the first short-hard gamma-ray burst afterglows in 2005, the handful of observed events have been found to be embedded in nearby (z < 1), bright underlying g…
Energy Injection in GRB Afterglow Models
Gudlaugur Johannesson, Gunnlaugur Bjornsson, Einar H. Gudmundsson
We extend the standard fireball model, widely used to interpret gamma-ray burst (GRB) afterglow light curves, to include energy injections, and apply the model to the afterglow lig…
Spectro-photometric study of the GRB 030329 host galaxy
J. Gorosabel, D. Perez-Ramirez, J. Sollerman +13
In this study optical/near-infrared(NIR) broad band photometry and optical spectroscopic observations of the GRB 030329 host galaxy are presented. The Spectral Energy Distribution…
Ly-alpha and UV emission from high-redshift GRB hosts: To what extent do GRBs trace star formation?
P. Jakobsson, G. Bjornsson, J. P. U. Fynbo +9
We report the result of a search for Ly-alpha emission from the host galaxies of the gamma-ray bursts (GRBs) 030226 (z = 1.986), 021004 (z = 2.335) and 020124 (z = 3.198). We find…