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星期三, 十二月 10, 2008

Tanvir 2008 GRB 080319B的晚期余辉观测

主要内容:
有jet break, 有超新星成份.

精彩摘抄:


文章信息:

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Title:
Late time observations of GRB080319B: jet break, host galaxy and accompanying supernova
Authors:
Tanvir, Nial R.; Rol, Evert; Levan, Andrew; Fruchter, Andrew; Granot, Jonathan; Svensson, Karl M.; O'Brien, Paul T.; Wiersema, Klaas; Starling, Rhaana L. C.; Jakobsson, Pall; Fynbo, Johan; Hjorth, Jens; Curran, Peter; van der Horst, Alexander J.; Kouveliotou, Chryssa; Racusin, Judith L.; Burrows, David N.; Genet, Frank
Publication:
eprint arXiv:0812.1217
Publication Date:
12/2008
Origin:
ARXIV
Keywords:
Astrophysics
Comment:
10 pages. Submitted to ApJ
Bibliographic Code:
2008arXiv0812.1217T

Abstract

The Swift-discovered GRB080319B was by far the most distant source ever observed at naked eye brightness, reaching a peak magnitude of 5.3 at a redshift of z=0.937. We present our late time optical and X-ray observations, which confirm that an achromatic break occurred in the power-law afterglow light curve at ~10^6 s post-burst. This most likely indicates that the gamma-ray burst (GRB) outflow was collimated, which for a uniform jet would imply a total energy in the jet E_{jet} \gsim 10^{52.5} erg. Our observations also show a late-time excess of red light, which is well explained if the GRB was accompanied by a supernova, similar to those seen in some other long-duration GRBs. The latest observations are dominated by light from the host and show that the GRB took place in a faint dwarf galaxy (r(AB) = 27.2, rest-frame M_B = -17.3). This galaxy is small even by the standards of other GRB hosts, which is suggestive of a low metallicity environment.
Bibtex entry for this abstract Preferred format for this abstract (see Preferences)

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