Tanvir, N. R., Rol, E., Levan, A. J., Svensson, K. M. (Karl Mikael), Fruchter, A. S., Granot, J., O'Brien, P. T., Wiersema, K., Starling, R. L. C., Jakobsson, P., Fynbo, J., Hjorth, J., Curran, P. A., Horst, A. J. van der (Alexander J. van der), Kouveliotou, Chryssa, Racusin, J. L., Burrows, D. N. and Genet, F.. (2010) Late-time observations of GRB 080319B: jet break, host galaxy, and accompanying supernova. Astrophysical Journal, Vol.725 (No.1). pp. 625-632. ISSN 0004-637X

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Abstract

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 Telescope, Gemini, and Very Large Telescope) and X-ray (Chandra) observations, which confirm that an achromatic break occurred in the power-law afterglow light curve at similar to 11 days 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 greater than or similar to 10(52) erg. Our observations also show a late-time excess of red light, which is well explained if the GRB was accompanied by a supernova (SN), 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) approximate to 27.0, rest frame M-B approximate to -17.2). This galaxy is small even by the standards of other GRB hosts, which is suggestive of a low-metallicity environment. Intriguingly, the properties of this extreme event-a small host and bright SN-are entirely typical of the very low luminosity bursts such as GRB 980425 and GRB 060218.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Astrophysical Journal
Publisher:	IOP Publishing
ISSN:	0004-637X
Date:	December 2010
Volume:	Vol.725
Number:	No.1
Number of Pages:	8
Page Range:	pp. 625-632
Identification Number:	10.1088/0004-637X/725/1/625
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Royal Society (Great Britain), NASA, NSF, National Science Foundation (United States), Science and Technology Facilities Council (United Kingdom), National Research Council (Canada), CONICYT (Chile), Australian Research Council (Australia), Ministrio da Cincia e Tecnologia (Brazil), SECYT (Argentina), Danish National Research Foundation, STFC, NASA at the MSFC, NASA
Grant number:	NAS 5-26555
URI:	http://wrap.warwick.ac.uk/id/eprint/4759

Data sourced from Thomson Reuters' Web of Knowledge

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