Mathematics – Logic
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997natur.389..261f&link_type=abstract
Nature, Volume 389, Issue 6648, pp. 261-263 (1997).
Mathematics
Logic
403
Scientific paper
Important insight into the nature of γ-ray bursts (GRBs) has been gained in recent months mainly due to the immediate, precise localization of the bursts and the discovery of relatively long-lived X-ray afterglows by the satellite BeppoSAX. These advances have enabled deep searches which have led to the discovery of optical transients coincident with fading X-ray sources. Optical spectroscopy of the latest burst (GRB970508; ref. 8) has clearly demonstrated that it lies at a cosmological distance, thus resolving a long-standing controversy about the distance scale to GRBs. Here we report a variable radio source within the error box of GRB970508 and coincident with the optical transient. We suggest that this is the much-sought-after radio counterpart of a GRB. If the observed fluctuations in the radio emission (`twinkling') are a result of a strong scattering by the irregularities in the ionized Galactic interstellar gas, then the source must have an angular size of about 3 microarcseconds in the first few weeks. The damping of the fluctuations with time indicates that the source expands to a significantly larger size later on.
Feroci Marco
Frail Dale A.
Kulkarni Sanjeev R.
Nicastro Luciano
Taylor Greg B.
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