Bibliographic Details
| 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 |
| Source: |
Astrophys.J.725:625-632,2010 |
| Publication Year: |
2008 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics |
| More Details: |
The Swift discovered GRB080319B 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 (HST, Gemini & VLT) 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} \gsim 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)\approx27.0, rest-frame M_B\approx-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 supernova - are entirely typical of the very low-luminosity bursts such as GRB980425 and GRB060218.
Comment: Revised in response to referee's comments, and with some additional data added |
| Document Type: |
Working Paper |
| DOI: |
10.1088/0004-637X/725/1/625 |
| Access URL: |
http://arxiv.org/abs/0812.1217 |
| Accession Number: |
edsarx.0812.1217 |
| Database: |
arXiv |
