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A tale of two GRB-SNe at a common redshift of z = 0.54
Z. Cano, D. Bersier, C. Guidorzi +71
We present ground-based and HST optical observations of the optical transients (OTs) of long-duration Gamma Ray Bursts (GRBs) 060729 and 090618, both at a redshift of z = 0.54. For…
Optical atmospheric extinction over Cerro Paranal
F. Patat, S. Moehler, K. O'Brien +14
Aims: The present study was conducted to determine the optical extinction curve for Cerro Paranal under typical clear-sky observing conditions, with an accuracy of 0.01 mag/airmass…
GRB 090313 and the Origin of Optical Peaks in GRB Light Curves: Implications for Lorentz Factors and Radio Flares
A. Melandri, S. Kobayashi, C. G. Mundell +18
We use a sample of 19 Gamma Ray Bursts (GRBs) that exhibit single-peaked optical light curves to test the standard fireball model by investigating the relationship between the time…
OCTOCAM: A fast multichannel imager and spectrograph for the 10.4m GTC
Antonio de Ugarte Postigo, Javier Gorosabel, Paolo Spano +11
OCTOCAM is a multi-channel imager and spectrograph that has been proposed for the 10.4m GTC telescope. It will use dichroics to split the incoming light to produce simultaneous obs…
VLT/X-shooter spectroscopy of the GRB 090926A afterglow
V. D'Elia, J. P. U. Fynbo, S. Covino +21
The aim of this paper is to study the environment and intervening absorbers of the gamma-ray burst GRB 090926A through analysis of optical spectra of its afterglow. We analyze medi…
Challenging GRB models through the broadband dataset of GRB060908
S. Covino, S. Campana, M. L. Conciatore +37
Context: Multiwavelength observations of gamma-ray burst prompt and afterglow emission are a key tool to disentangle the various possible emission processes and scenarios proposed…
Searching for differences in Swift's intermediate GRBs
A. de Ugarte Postigo, I. Horváth, P. Veres +16
Gamma-ray bursts are usually classified through their high-energy emission into short-duration and long-duration bursts, which presumably reflect two different types of progenitors…
Discovery of the afterglow and host galaxy of the low redshift short GRB 080905A
A. Rowlinson, K. Wiersema, A. J. Levan +10
We present the discovery of short GRB 080905A, its optical afterglow and host galaxy. Initially discovered by Swift, our deep optical observations enabled the identification of a f…
GRB 021004: Tomography of a gamma-ray burst progenitor and its host galaxy
A. J. Castro-Tirado, P. Möller, G. García-Segura +23
We analyse the distribution of matter around the progenitor star of gamma-ray burst GRB 021004 as well as the properties of its host galaxy with high-resolution echelle as well as…
Detailed Classification of Swift's Gamma-Ray Bursts
I Horvath, Z Bagoly, LG Balazs +3
Earlier classification analyses found three types of gamma-ray bursts (short, long and intermediate in duration) in the BATSE sample. Recent works have shown that these three group…
Four Years of Realtime GRB Followup by BOOTES-1B (2005-2008)
Martin Jelinek, Alberto J. Castro-Tirado, Antonio de Ugarte Postigo +8
Four years of BOOTES-1B GRB follow-up history are summarised for the first time in the form of a table. The successfully followed events are described case by case. Further, the da…
Recent GRBs observed with the 1.23m CAHA telescope and the status of its upgrade
Javier Gorosabel, Petr Kubanek, Martin Jelinek +13
We report on optical observations of Gamma-Ray Bursts (GRBs) followed up by our collaboration with the 1.23m telescope located at the Calar Alto observatory. The 1.23m telescope is…