Browsing by Author "Levan, A."

Now showing items 1-20 of 31

    • 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 ...

    • A case of mistaken identity GRB 060912A and the nature of the long-short GRB divide 

      Levan, A.; Jakobsson, P.; Hurkett, C.; Tanvir, N.; Gorosabel, J.; Vreeswijk, P.M.; Rol, E.; Chapman, R.; Gehrels, N.; O'Brien, O.T.; Osborne, J.P.; Priddey, R.; Kouveliotou, C.; Starling, R.L.; Vanden Berk, D.; Wiersema, K. (2007)

    • Compact binaries, hypernovae, and GRBs 

      Davies, M.B.; Levan, A. (2010)
      The collapse of a massive stellar core may lead to the production of a black hole surrounded by a torus of material. Such a system is a potential source for the so-called long gamma-ray bursts (GRBs). A torus will form ...

    • The cosmic build-up of dust and metals : Accurate abundances from GRB-selected star-forming galaxies at 1.7 < z < 6.3 

      Heintz, K. E.; Cia, A. De; Thöne, C. C.; Krogager, J. -K.; Yates, R. M.; Vejlgaard, S.; Konstantopoulou, C.; Fynbo, J. P. U.; Watson, D.; Narayanan, D.; Wilson, S. N.; Arabsalmani, M.; Campana, S.; D'Elia, V.; Pasquale, M. De; Hartmann, D. H.; Izzo, L.; Jakobsson, P.; Kouveliotou, C.; Levan, A.; Li, Q.; Malesani, D. B.; Melandri, A.; Milvang-Jensen, B.; Møller, P.; Palazzi, E.; Palmerio, J.; Petitjean, P.; Pugliese, G.; Rossi, A.; Saccardi, A.; Salvaterra, R.; Savaglio, S.; Schady, P.; Stratta, G.; Tanvir, N. R.; Postigo, A. de Ugarte; Vergani, S. D.; Wiersema, K.; Wijers, R. A. M. J.; Zafar, T. (2023-11-15)
      The chemical enrichment of dust and metals in the interstellar medium of galaxies throughout cosmic time is one of the key driving processes of galaxy evolution. Here we study the evolution of the gas-phase metallicities, ...

    • 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)

    • 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)

    • 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 050814 at z = 5.3 and the Redshift Distribution of Swift GRBs 

      Jakobsson, P.; Levan, A.; Fynbo, J. (2006)

    • GRB 050814 at z = 5.3 and the Redshift Distribution of Swift GRBs 

      Jakobsson, P.; Levan, A.; Fynbo, J. (American Institute of Physics (AIP), 2006)

    • GRB 060206 and the quandary of achromatic breaks in afterglow light curves 

      Curran, P.; van der Horst, A.J.; Wijers, R.A.M.J.; Starling, R.L.; Castro-Tirado, A.J.; Fynbo, J.; Gorosabel, J.; Jarvinen, A.S.; Malesani, D.; Rol, E.; Tanvir, N.; Wiersema, K.; Burleigh, M.R.; Casewell, S.L.; Dobbie, P.D.; Guziy, S.; Jakobsson, P.; Jelinek, M.; Laursen, P.; Levan, A.; Mundell, C.G.; Naranen, J.; Piranomonte, S. (2007)

    • GRB 080503: Implications of a Naked Short Gamma-Ray Burst Dominated by Extended Emission 

      Perley, D.A.; Metzger, B.D.; Granot, J.; Butler, N.R.; Sakamoto, T.; Ramirez-Ruiz, E.; Levan, A.; Bloom, J.S.; Miller, A.A.; Bunker, A.; Chen, H-W.; Filippenko, A.; Gehrels, N.; Glazebrook, K.; Hall, P.B.; Hurley, K.; Kocevski, D.; Li, W.; Lopez, S.; Norris, J.; Piro, A.L.; Poznanski, D.; Prochaska, J.X.; Quataert, E.; Tanvir, N. (2009)
      We report on observations of GRB 080503, a short gamma-ray burst (GRB) with very bright extended emission (about 30 times the gamma-ray fluence of the initial spike) in conjunction with a thorough comparison to other short ...

    • GRB 090902B: afterglow observations and implications 

      Pandey, S.B.; Swenson, C.A.; Perley, D.A.; Guidorzi, C.; Wiersema, K.; Malesani, D.; Akerlof, C.; Ashley, M.C.B.; Bersier, D.; Cano, Z.; Gomboc, A.; Ilyin, I.; Jakobsson, P.; Kleiser, I.K.W.; Kobayashi, S.; Kouveliotou, C.; Levan, A.; McKay, T.A.; Melandri, A.; Mottram, C.J.; Mundell, C.G.; O'Brien, P.T.; Phillips, A.; Rex, J.M.; Siegel, M.H.; Smith, R.J.; Steele, I.A.; Stratta, G.; Tanvir, N.; Weights, D.; Yost, S.A.; Yuan, F.; Zheng, W. (2010)
      The optical-infrared afterglow of the Large Area Telescope (LAT)-detected long-duration burst, GRB 090902B, has been observed by several instruments. The earliest detection by ROTSE-IIIa occurred 80 minutes after detection ...

    • How common are long gamma-ray bursts in the local universe 

      Chapman, R.; Tanvir, N.; Priddey, R.; Levan, A. (2007)

    • 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 ...

    • 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)

    • A Mean Redshift of 2.8 for Swift gamma - ray bursts 

      Jakobsson, P.; Levan, A.; Fynbo, J.; Priddey, R.; Hjorth, J.; Tanvir, N.; Watson, D.; Jensen, B.L.; Sollerman, J.; Natarajan, P.; Gorosabel, J.; Castro Ceron, J.M.; Pedersen, K.; Pursimo, T.; Arnadottir, A.S.; Castro-Tirado, A.J.; Davis, C.J.; Deeg, H-J.; Fiuza, D.A.; Mykolaitis, S.; Sousa, S.G. (2006-03)

    • Millimetric properties of gamma-ray burst host galaxies 

      Priddey, R.; Tanvir, N.; Levan, A.; Fruchter, A.S.; Kouveliotou, C.; Smith, I.A.; Wijers, R.A.M.J. (2006)

    • The nature of the x-ray flash of August 24 2005 

      Sollerman, J.; Fynbo, J.; Gorosabel, J.; Halpern, J.P.; Hjorth, J.; Jakobsson, P.; Mirabal, N.; Watson, D.; Xu, D.; Castro-Tirado, A.J.; Feron, C.; Jaunsen, A.O.; Jelinek, M.; Jensen, B.L.; Kann, D.A.; Ovaldsen, J-E.; Pozanenko, A.; Stritzinger, M.; Thoene, C.C.; de Ugarte Postigo, A.; Guziy, S.; Ibrahimov, M.; Jaervinen, S.P.; Levan, A.; Rumyantsev, V.; Tanvir, N. (2007)

    • A near-infrared spectroscopic search for very-low-mass cool companions to notable DA white dwarfs 

      Dobbie, P.D.; Burleigh, M.R.; Levan, A.; Barstow, M.A.; Napiwotzki, R.; Holberg, J.B.; Hubeny, I.; Howell, S.B. (2005)