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Browsing by Author "Hjorth, J."
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Absorption systems in the spectrum of GRB 021004
Moller, P.; Fynbo, J.; Hjorth, J.; Thomsen, B.; Egholm, M.P.; Andersen, M.I.; Gorosabel, J.; Holland, S.T.; Jakobsson, P.; Jensen, B.L.; Pedersen, H.; Pedersen, K.; Weidinger, M. (2002)We report on a 3600 s spectrum of GRB 021004 obtained with the Nordic Optical Telecope on La Palma 10.71 hours after the burst. We identify absorption lines from five systems at redshifts 1.3806, 1.6039, 2.2983, 2.3230, ... -
The afterglow and the host galaxy of GRB 011211
Jakobsson, P.; Hjorth, J.; Fynbo, J.; Gorosabel, J.; Pedersen, K.; Burud, I.; Levan, A.; Kouveliotou, C.; Tanvir, N.; Fruchter, A.S.; Rhoads, J.E.; Grav, T.; Hansen, M.W.; Michelsen, R.; Andersen, M.I.; Jensen, B.L.; Pedersen, K.; Thomsen, B.; Weidinger, M.; Causik, R.; Pandey, S.B. (2003)We present optical, near-infrared, and X-ray observations of the optical afterglow (OA) of the X-ray rich, longduration gamma-ray burst GRB 011211. Hubble Space Telescope (HST) data obtained 14, 26, 32, and 59 days after ... -
Are short y-ray bursts collimated GRB 050709, a flare but no break
Watson, D.; Hjorth, J.; Jakobsson, P.; Xu, D.; Fynbo, J.; Sollerman, J.; Thone, C.C.; Pedersen, K. (2006)Context. From the small sample of afterglow lightcurves of short duration γ-ray bursts (GRBs), the decays are rapid, roughly following a power-law in time. It has been assumed that the afterglow emission in short GRBs is ... -
Constraints on an optical afterglow and on supernova light following the short burst GRB 050813
Ferrero, P.; Sanchez, S.F.; Kann, D.A.; Klose, S.; Greiner, J.; Gorosabel, J.; Hartmann, D.H.; Henden, A.A.; Moller, P.; Palazzi, E.; Rau, A.; Stecklum, B.; Castro-Tirado, C.; Fynbo, J.; Hjorth, J.; Jakobsson, P.; Kouveliotou, C.; Masetti, N.; Pian, E.; Tanvir, N.; Wijers, R.A.M.J. (2007) -
Depletion of background galaxies owing to the cluster lens CL0024+1654: U- and R-band observations
Rognvaldsson, O.E.; Greve, T.R.; Hjorth, J.; Gudmundsson, E.H.; Sigmundsson, V.S.; Jakobsson, P.; Jaunsen, A.O.; Christensen, L.; van Kampen, E.; Taylor, A.N. (2001) -
Early spectroscopic identification of SN 2008D
Malesani, D.; Fynbo, J.; Hjorth, J.; Leloudas, G.; Sollerman, J.; Stritzinger, M.; Vreeswijk, P.M.; Watson, D.; Gorosabel, J.; Michalowski, M.; Thone, C.C.; Augusteijn, T.; Bersier, D.; Jakobsson, P.; Jaunsen, A.O.; Ledoux, C.; Levan, A.; Milvang-Jensen, B.; Rol, E.; Tanvir, N.; Wiersema, K.; Xu, D. (2009)SN 2008D was discovered while following up an unusually bright X-ray transient (XT) in the nearby spiral galaxy NGC 2770. We present early optical spectra (obtained 1.75 days after the XT) which allowed the first identification ... -
The extreme red afterglow of GRB 060923: distance or dust?
Tanvir, N.; Levan, A.; Rol, E.; Starling, R.L.; Gorosabel, J.; Priddey, R.; Malesani, D.; Jakobsson, P.; O'Brien, P.T.; Jaunsen, A.O.; Hjorth, J.; Fynbo, J.; Melandri, A.; Gomboc, A.; Milvang-Jensen, B.; Fruchter, A.S.; Jarvis, M.J.; Fernandes, C.A.C.; Wold, T. (2008) -
An extremely luminous panchromatic outburst from the nucleus of a distant galaxy
Levan, Andrew; Tanvir, Nial; Cenko, S.B.; Perley, D.A.; Wiersema, K.; Bloom, J.S.; Fruchter, A.S.; Postigo, A.; O'Brien, O.T.; Butler, N.R.; van der Horst, A.J.; Leloudas, G.; Morgan, A.N.; Misra, K.; Bower, G.C.; Farihi, J.; Tunnicliffe, R.L.; Modjaz, M.; Silverman, J.M.; Hjorth, J.; Thone, C.C.; Cucchiara, A.; Ceron, J.M.C.; Castro-Tirado, A.J.; Arnold, J.A.; Bremer, M.; Brodie, J.P.; Carroll, T.; Cooper, M.C.; Curran, P.; Cutri, R.M.; Ehle, J.; Forbes, D.; Fynbo, J.; Gorosabel, J.; Graham, J.; Hoffman, D.I.; Guziy, S.; Jakobsson, Pall; Kamble, A.P.; Kerr, T.H.; Kasliwal, M.M.; Kouveliotou, C.; Kocevski, D.; Law, N.M.; Nugent, P.; Ofek, E.O.; Poznanski, D.; Quimby, R.M.; Rol, E.; Romanowsky, A.J.; Sanchez-Ramirez, R.; Schulze, S.; Singh, N.; Van Spaandonk, Lieke; Starling, R.L.; Strom, R.G.; Tello, J.C.; Vaduvescu, O.; Wheatley, P.J.; Wijers, R.A.M.J.; Winters, J.M.; Xu, D. (2011)Variable x-ray and gamma-ray emission is characteristic of the most extreme physical processes in the universe. We present multiwavelength observations of a unique gamma-ray-selected transient detected by the Swift satellite, ... -
The Faint Afterglow and Host Galaxy of the Short Hard GRB 060121
Levan, A.; Tanvir, N.; Fruchter, A.S.; Rol, E.; Fynbo, J.; Hjorth, J.; Williams, G.; Bergeron, E.; Bersier, D.; Bremer, M.; Grav, T.; Jakobsson, P.; Nilsson, K.; Olszewski, E.; Priddey, R.; Rafferty, D.; Rhoads, J.E. (2006) -
Fundamental Properties of GRB-Selected Galaxies: A Swift/VLT Legacy Survey
Jakobsson, P.; Hjorth, J.; Fynbo, J.; Gorosabel, J.; Jaunsen, A.O. (2007) -
The GRB 030329 host: a blue low metallicity subluminous galaxy with intense star formation
Gorosabel, J.; Perez-Ramirez, D.; Sollerman, J.; de Ugarte Postigo, A.; Fynbo, J.; Castro-Tirado, A.J.; Jakobsson, P.; Christensen, L.; Hjorth, J.; Johannesson, G.; Guziy, S.; Castro Ceron, J.M.; Bjornsson, G.; Sokolov, V.V.; Fatkhullin, T.A.; Nilsson, K. (2005) -
GRB 050509B: Constraints on Short Gamma Ray Burst Models
Hjorth, J.; Sollerman, J.; Gorosabel, J.; Granot, J.; Klose, S.; Kouveliotou, C.; Melinder, J.; Ramirez-Ruiz, E.; Starling, R.L.; Thomsen, B.; Anderson, M.I.; Fynbo, J.; Jensen, B.L.; Vreeswijk, P.M.; Castro Ceron, J.M.; Jakobsson, P.; Levan, A.; Pedersen, K.; Rhoads, J.E.; Tanvir, N.; Watson, D.; Wijers, R.A.M.J. (2005-09) -
GRB afterglows: illuminating the star-forming universe
Vreeswijk, P.M.; Moller, P.; Ledoux, C.; Ellison, C.; Masetti, N.; Fynbo, J.; Jakobsson, P.; Hjorth, J. (2004) -
HI column densities of z>2 Swift gamma-ray bursts
Jakobsson, P.; Fynbo, J.; Ledoux, C.; Vreeswijk, P.M.; Kann, D.A.; Hjorth, J.; Priddey, R.; Tanvir, N.; Reichart, D. (2006) -
Late-time observations of GRB 080319B: jet break, host galaxy and accompanying supernova
Tanvir, N.; Rol, E.; Levan, A.; Svensson, K.; Fruchter, A.S.; Granot, J.; O'Brien, P.T.; Wiersema, K.; Starling, R.L.; Jakobsson, P.; Fynbo, J.; Hjorth, J.; Curran, P.; van der Horst, A.J.; Kouveliotou, C.; Racusin, J.L.; Burrows, D.N.; Genet, F. (2010)The Swift-discovered GRB 080319B was by far the most distant source ever observed at naked-eye brightness, reaching a peak apparent magnitude of 5.3 at a redshift of z = 0.937. We present our late-time optical (Hubble Space ... -
Lens magnification by CL0024+1654 in the and band
Dye, S.; Taylor, A.N.; Greve, T.R.; Rognvaldsson, O.E.; van Kampen, E.; Jakobsson, P.; Sigmundsson, V.S.; Gudmundsson, E.H.; Hjorth, J. (2002) -
The line-of-sight towards GRB 030429 at z =2.66: Probing the matter at stellar, galactic and intergalactic scales
Jakobsson, P.; Hjorth, J.; Fynbo, J.; Weidinger, M.; Gorosabel, J.; Ledoux, C.; Watson, D.; Bjornsson, G.; Gudmundsson, E.H.; Wijers, R.A.M.J.; Moller, P.; Pedersen, K.; Sollerman, J.; Henden, A.A.; Jensen, B.L.; Gilmore, A.; Levan, A.; Castro Ceron, J.M.; Castro-Tirado, A.J.; Fruchter, A.S.; Kouveliotou, C.; Masetti, N.; Tanvir, N. (2004-12) -
Low-resolution VLT spectroscopy of GRBs 991216, 011211 and 021211
Vreeswijk, P.M.; Smette, A.; Fruchter, S.; Palazzi, E.; Rol, E.; Wijers, R.A.M.J.; Kouveliotou, C.; Kaper, L.; Pian, E.; Masetti, N.; Frontera, F.; Hjorth, J.; Gorosabel, J.; Piro, L.; Fynbo, J.; Jakobsson, P.; Watson, D.; O'Brien, P.T.; Ledoux, C. (2006) -
Ly+ and ultraviolet emission from high-redshift gamma-ray burst hosts: to what extent do gamma-ray bursts trace star formation
Jakobsson, P.; Bjornsson, G.; Fynbo, J.; Johannesson, G.; Hjorth, J.; Thomsen, B.; Moller, P.; Watson, D.; Jensen, B.L.; Ostlin, G.; Gorosabel, J.; Gudmundsson, E.H. (2005) -
Massive star-formation rates of y-ray burst host galaxies: An unobscured view in X-rays
Watson, D.; Hjorth, J.; Jakobsson, P.; Pedersen, K.; Patel, S.K.; Kouveliotou, C. (2004)