The decay of optical emission from the gamma-ray burst GRB970228
Article Abstract:
The origin of gamma-ray bursts has been unresolved for nearly 30 years, and recent discoveries have found fading sources at X-ray and optical wavelengths in the location of the gamma-ray burst GRB970228. The existing photometry of the optical counterpart of GRB970228 is re-evaluated, building an optical light curve for the transient event. The study found that the R-band brightness was lessened between 21 hours and six days after the burst, and the behaviour of the source may be consistent with the fireball model.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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An X-ray pulsar with a superstrong magnetic field in the soft gamma-ray repeater SGR1806-20
Article Abstract:
Soft gamma-ray repeaters (SGRs) are extremely rare, with only four known to exist. They differ from classical gamma-ray bursters in that they emit repeated, intense, brief outbursts of low-energy gamma rays. New research has led to the discovery of an X-ray pulsar in SGR1806-20. The properties of the pulsar may answer some of the questions about the nature of SGRs. The star's existence suggests that SGR bursts are caused by starquakes resulting from magnetic stresses.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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A hypernova model for the supernova associated with the gamma-ray burst of 25 April 1998
Article Abstract:
New insights into the explosion mechanisms of massive stars and the origins of certain gamma-ray bursts are provided with the discovery of the unusual supernova SN1998bw. SN1988bw is thought to be a type Ic supernova although it has high peak luminosity. Its optical spectra and light curve is well reproduced by an energetic explosion of a large star consisting mainly of carbon and oxygen. Such a supernova may be termed hypernova.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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