期刊
ASTROPHYSICAL JOURNAL
卷 725, 期 1, 页码 625-632出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/725/1/625
关键词
high-redshift; gamma-ray burst: individual (GRB 080319B); supernovae: individual
资金
- NASA [NAS 5-26555]
- 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
- Royal Society
- NASA at the MSFC
- NASA
- Science and Technology Facilities Council [ST/G002630/1, PP/E002064/1, ST/H001972/1, ST/F002599/1] Funding Source: researchfish
- UK Space Agency [ST/G008655/1] Funding Source: researchfish
- STFC [ST/F002599/1, ST/G002630/1, PP/E002064/1, ST/H001972/1] Funding Source: UKRI
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.
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