TY - JOUR
T1 - Late-time observations of GRB 080319B
T2 - Jet break, host galaxy, and accompanying supernova
AU - Tanvir, N. R.
AU - Rol, E.
AU - Levan, A. J.
AU - Svensson, K.
AU - Fruchter, A. S.
AU - Granot, J.
AU - O'Brien, P. T.
AU - Wiersema, K.
AU - Starling, R. L.C.
AU - Jakobsson, P.
AU - Fynbo, J.
AU - Hjorth, J.
AU - Curran, P. A.
AU - Van Der Horst, A. J.
AU - C.Kouveliotou,
AU - Racusin, J. L.
AU - Burrows, D. N.
AU - Genet, F.
PY - 2010/12/10
Y1 - 2010/12/10
N2 - 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 ∼ 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 Ejet ≲ 1052 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) ≈ 27.0, rest frame MB ≈ ?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.
AB - 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 ∼ 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 Ejet ≲ 1052 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) ≈ 27.0, rest frame MB ≈ ?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.
KW - Galaxies: high-redshift
KW - Gamma-ray burst: individual (GRB 080319B)
KW - Supernovae: individual Online-only material: color figures
UR - http://www.scopus.com/inward/record.url?scp=78649994547&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/725/1/625
DO - 10.1088/0004-637X/725/1/625
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AN - SCOPUS:78649994547
SN - 0004-637X
VL - 725
SP - 625
EP - 632
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
ER -