Zobrazeno 1 - 10
of 139
pro vyhledávání: '"Bjornsson, G."'
Autor:
De Cia, A., Ledoux, C., Fox, A. J., Vreeswijk, P. M., Smette, A., Petitjean, P., Bjornsson, G., Fynbo, J. P. U., Hjorth, J., Jakobsson, P.
We analyse high-resolution near-UV and optical spectra of the afterglow of GRB 080310, obtained with the Very Large Telescope Ultraviolet and Visual Echelle Spectrograph (VLT/UVES), to investigate the circumburst environment and the interstellar medi
Externí odkaz:
http://arxiv.org/abs/1207.6102
Autor:
Gorosabel, J., Perez-Ramirez, D., Sollerman, J., Postigo, A. de Ugarte, Fynbo, J. P. U., Castro-Tirado, A. J., Jakobsson, P., Christensen, L., Hjorth, J., Johannesson, G., Guziy, S., Cerón, J. M. Castro, Bjornsson, G., Sokolov, V. V., Fatkhullin, T. A., Nilsson, K.
Publikováno v:
Nuovo Cim.C28:673-676,2005
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 (SED) of the host is consistent with a starburst galaxy template with
Externí odkaz:
http://arxiv.org/abs/astro-ph/0508541
Autor:
Gorosabel, J., Pérez-Ramírez, D., Sollerman, J., Postigo, A. de Ugarte, Fynbo, J. P. U., Castro-Tirado, A. J., Jakobsson, P., Christensen, L., Hjorth, J., Jóhannesson, G., Guziy, S., Cerón, J. M. Castro, Bjornsson, G., Sokolov, V. V., Fatkhullin, T. A., Nilsson, K.
Publikováno v:
Astron.Astrophys. 444 (2005) 711-721
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 metallicity galaxy (Z~0.004). The spectral energy distribution (SED) constru
Externí odkaz:
http://arxiv.org/abs/astro-ph/0507488
Autor:
Postigo, A. de Ugarte, Castro-Tirado, A. J., Gorosabel, J., Jóhannesson, G., Bjornsson, G., Gudmundsson, E. H., Bremer, M., Pak, S., Tanvir, N., Cerón, J. M. Castro, Guzyi, S., Jelínek, M., Klose, S., Pérez-Ramírez, D., Aceituno, J., Bagatín, A. Campo, Covino, S., Cardiel, N., Fathkullin, T., Henden, A. A., Huferath, S., Kurata, Y., Malesani, D., Mannucci, F., Ruiz-Lapuente, P., Sokolov, V., Thiele, U., Wisotzki, L., Antonelli, L. A., Bartolini, C., Boattini, A., Guarnieri, A., Piccioni, A., Pizzichini, G., del Principe, M., di Paola, A., Fugazza, D., Ghisellini, G., Hunt, L., Konstantinova, T., Masetti, N., Palazzi, E., Pian, E., Stefanon, M., Testa, V., Tristram, P. J.
Publikováno v:
Astron.Astrophys. 443 (2005) 841-849
GRB 021004 is one of the best sampled gamma-ray bursts (GRB) to date, although the nature of its light curve is still being debated. Here we present a large amount (107) of new optical, near-infrared (NIR) and millimetre observations, ranging from 2
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506544
Autor:
Jakobsson, P., Bjornsson, G., Fynbo, J. P. U., Johannesson, G., Hjorth, J., Thomsen, B., Moller, P., Watson, D., Jensen, B. L., Ostlin, G., Gorosabel, J., Gudmundsson, E. H.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 362 (2005) 245-251
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 that the host galaxy of GRB 021004 is an extended (around 8 kpc) stron
Externí odkaz:
http://arxiv.org/abs/astro-ph/0505542
Autor:
Fynbo, J. P. U., Krog, B., Nilsson, K., Bjornsson, G., Hjorth, J., Jakobsson, P., Ledoux, C., Moller, P., Thomsen, B.
Selection of starbursts through either deep narrow band imaging of redshifted Ly-alpha emitters, or localisation of host galaxies of gamma-ray bursts both give access to starburst galaxies that are significantly fainter than what is currently availab
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412343
Autor:
Jakobsson, P., Hjorth, J., Fynbo, J. P. U., Watson, D., Pedersen, K., Bjornsson, G., Gorosabel, J.
Publikováno v:
Astrophys.J. 617 (2004) L21-L24
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 bursts as those bursts that are optically subluminous with respect to
Externí odkaz:
http://arxiv.org/abs/astro-ph/0411036
Publikováno v:
Astrophys.J. 615 (2004) L77-L80
Several GRB afterglow light curves deviate strongly from the power law decay observed in most bursts. We show that these variations can be accounted for by including refreshed shocks in the standard fireball model previously used to interpret the ove
Externí odkaz:
http://arxiv.org/abs/astro-ph/0409584
Autor:
Jakobsson, P., Hjorth, J., Fynbo, J. P. U., 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., Kilmartin, P., Levan, A., Cerón, J. M. Castro, Castro-Tirado, A. J., Fruchter, A., Kouveliotou, C., Masetti, N., Tanvir, N.
Publikováno v:
Astron.Astrophys. 427 (2004) 785-794
We report the discovery of the optical afterglow (OA) of the long-duration gamma-ray burst GRB 030429, and present a comprehensive optical/near-infrared dataset used to probe the matter at different distance scales, i.e. in the burst environment, in
Externí odkaz:
http://arxiv.org/abs/astro-ph/0407439
Publikováno v:
Astrophys.J. 579 (2002) L59-L62
The optical lightcurve of GRB010222 exhibited one of the slowest decays of any gamma-ray burst to date. Its broadband properties have been difficult to explain with conventional afterglow models, as they either require the power law index of the unde
Externí odkaz:
http://arxiv.org/abs/astro-ph/0209585