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The Afterglow and the Host Galaxy of the Dark Burst GRB 970828
| Content Provider | Semantic Scholar |
|---|---|
| Author | Djorgovski, S. George Frail, Dale A. Kulkarni, Shri R. Bloom, Joshua S. Odewahn, Stephen C. Diercks, Alan H. |
| Copyright Year | 2001 |
| Abstract | GRB970828 was the first well-localized γ-ray burst (GRB) X-ray afterglow for which no optical afterglow was found despite a prompt, deep search down to Rlim ∼ 24.5 mag. We report the discovery of a short-lived radio flare within the X-ray localization error circle of this burst. Such radio flares are seen in about 25% of GRB afterglows and their origin is not well understood. The precise radio position enabled us to identify the likely host galaxy of this burst, and to measure its redshift, z = 0.9578. The host appears to be an interacting/merging system. Under the assumption that the X-ray afterglow is mainly due to synchrotron mechanism we infer the optical afterglow flux. The observed upper limits to the optical flux are easily explained by invoking an intervening dusty cloud within the host galaxy. These observations support the idea that GRBs with no detectable optical afterglows or “dark GRBs” can be due to dust extinction within the host galaxies. The census of dark GRBs can then be used to constrain the fraction of the obscured star formation in the universe. We argue that the existing data already indicate that the obscured star-formation rate is no more than 1/2 of that seen at UV and optical wavelengths. Subject headings: gamma rays:bursts – radio continuum:general – cosmology:observations Partially based on the observations obtained at the W. M. Keck Observatory which is operated by the California Association for Research in Astronomy, a scientific partnership among California Institute of Technology, the University of California and the National Aeronautics and Space Administration. Palomar Observatory, California Institute of Technology, MS 105-24, Pasadena, CA 91125 National Radio Astronomy Observatory, P. O. Box O, Socorro, NM 87801 Current address: Dept. of Physics and Astronomy, Arizona State University, Tempe, AZ 85287 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0107539v1.pdf |
| Alternate Webpage(s) | http://cds.cern.ch/record/512132/files/0107539.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Active galactic nucleus Apache Continuum Assignment Zero Astronomy Censuses Flux GRB10 wt Allele GUCY2C protein, human GZMB wt Allele Greater Than Inference Interaction Lindane MAG (cryptography) Medical Subject Headings Radiation Redshift Synchrotrons TEMPE Xara Flare wavelength |
| Content Type | Text |
| Resource Type | Article |
