– Niels Bohr Institutet - Københavns Universitet

Videresend til en ven Resize Print Bookmark and Share

Niels Bohr Institutet > Ansatte

VLT identification of the optical afterglow of the gamma-ray burst GRB 000131 at z=4.50

Publikation: Forskning - peer reviewTidsskriftartikel

Dokumenter

  • pdf

    285 KB, PDF-dokument

M. I. Andersen, J. Hjorth, H. Pedersen, B. L. Jensen, L. K. Hunt, J. Gorosabel, P. Moller, J. Fynbo, R. M. Kippen, B. Thomsen, L. F. Olsen, L. Christensen, Marianne Vestergaard, N. Masetti, E. Palazzi, K. Hurley, T. Cline, L. Kaper, A. O. Jaunsen

We report the discovery of the gamma-ray burst GRB 000131 and its optical afterglow. The optical identification was made with the VLT 84 hours after the burst following a BATSE detection and an Inter Planetary Network localization. GRB 000131 was a bright, long-duration GRB, with an apparent precursor signal 62 s prior to trigger. The afterglow was detected in ESO VLT, NTT, and DK1.54m follow-up observations. Broad-band and spectroscopic observations of the spectral energy distribution reveals a sharp break at optical wavelengths which is interpreted as a Ly-alpha absorption edge at 6700 A. This places GRB 000131 at a redshift of 4.500 +/- 0.015. The inferred isotropic energy release in gamma rays alone was approximately 10^54 erg (depending on the assumed cosmology). The rapid power-law decay of the afterglow (index alpha=2.25, similar to bursts with a prior break in the lightcurve), however, indicates collimated outflow, which relaxes the energy requirements by a factor of
OriginalsprogEngelsk
TidsskriftAstronomy & Astrophysics
Vol/bind364
Sider (fra-til)L54-L61
ISSN0004-6361
StatusUdgivet - 17 okt. 2000

Antal downloads er baseret på statistik fra Google Scholar og www.ku.dk


Ingen data tilgængelig

ID: 123370497