TY - JOUR
T1 - Late-time observations of GRB 080319B: jet break, host galaxy, and accompanying supernova
AU - Tanvir, Nial R
AU - Rol, Evert
AU - Levan, Andrew J
AU - Svensson, Karl Mikael
AU - Fruchter, Andrew S
AU - Granot, Jonathan
AU - O'Brien, Paul T
AU - Wiersema, Klass
AU - Starling, Rhaana L C
AU - Jakobsson, Pall
AU - Fynbo, Johan Peter Uldall
AU - Hjorth, Jens
AU - Curran, Peter A
AU - van der Horst, Alexander J
AU - Kouveliotou, Chryssa
AU - Racusin, Judith Lea
AU - Burrows, David N
AU - Genet, Franck
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 or a uniform jet would imply a total energy in the jet Ejet less than or equal to 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) approx equal to 27.0, rest frame MB approx equal 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
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 or a uniform jet would imply a total energy in the jet Ejet less than or equal to 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) approx equal to 27.0, rest frame MB approx equal 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
UR - http://iopscience.iop.org/0004-637X/725/1/625/pdf/0004- 637X_725_1_625.pdf
U2 - 10.1088/0004-637X/725/1/625
DO - 10.1088/0004-637X/725/1/625
M3 - Article
VL - 725
SP - 625
EP - 632
JO - The Astrophysical Journal
JF - The Astrophysical Journal
SN - 1538-4357
IS - 1
ER -