TY - JOUR
T1 - Late-time observations of GRB 080319B: jet break, host galaxy and accompanying supernova
AU - Tanvir, N.
AU - Rol, E.
AU - Levan, A.
AU - Svensson, K.
AU - Fruchter, A.S.
AU - Granot, J.
AU - O'Brien, P.T.
AU - Wiersema, K.
AU - Starling, R.L.
AU - Jakobsson, P.
AU - Fynbo, J.
AU - Hjorth, J.
AU - Curran, P.
AU - van der Horst, A.J.
AU - Kouveliotou, C.
AU - Racusin, J.L.
AU - Burrows, D.N.
AU - Genet, F.
N1 - Original article can be found at: http://iopscience.iop.org/0004-637X Copyright American Astronomical Society [Full text of this article is not available in the UHRA]
PY - 2010
Y1 - 2010
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 E jet 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 E jet 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.
U2 - 10.1088/0004-637X/725/1/625
DO - 10.1088/0004-637X/725/1/625
M3 - Article
SN - 0004-637X
VL - 725
SP - 625
EP - 632
JO - The Astrophysical Journal
JF - The Astrophysical Journal
IS - 1
ER -