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An X-ray pulsar with a superstrong magnetic field in the soft γ-ray repeater SGR1806 − 20
Soft γ-ray repeaters (SGRs) emit multiple, brief (∼0.1-s), intense outbursts of low-energy γ-rays. They are extremely rare—three are known in our Galaxy and one in the Large Magellanic Cloud. TwoExpand
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An unusual supernova in the error box of the γ-ray burst of 25 April 1998
We report the discovery of transient optical emission in the error box of the γ-ray burst GRB980425, the light curve of which was very different from that of previous optical afterglows associated with β�-ray bursts. Expand
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A hypernova model for the supernova associated with the γ-ray burst of 25 April 1998
The discovery of the unusual supernova SN1998bw, and its possible association with the γ-ray burst GRB 980425, provide new insights into the explosion mechanism of very massive stars and the originExpand
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The effect of magnetic fields on γ-ray bursts inferred from multi-wavelength observations of the burst of 23 January 1999
Gamma-ray bursts (GRBs) are thought to arise when an extremely relativistic outflow of particles from a massive explosion (the nature of which is still unclear) interacts with material surroundingExpand
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Infrared helium emission lines from Cygnus X-3 suggesting a Wolf-Rayet star companion
CYGNUS X-3 is one of the most luminous X-ray sources in the Galaxy1,2, a bright infrared source3 and a radio source that undergoes huge outbursts4. The system is a binary, presumably a neutron starExpand
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Where is SGR 1806-20?
We apply a statistical method to derive very precise locations for soft gamma repeaters using data from the interplanetary network. We demonstrate the validity of the method by deriving a 600 arcsec2Expand
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A new type of transient high-energy source in the direction of the Galactic Centre
SOURCES of high-energy (>20 keV) bursts fall into two distinct types: the non-repeating γ-ray bursters1, several thousand of which have been detected but whose origin remains unknown, and the softExpand
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The rarity of soft γ-ray repeaters deduced from reactivation of SGR1806 – 20
ONLY two different types of γ-ray transient sources are presently known: over one thousand γ-ray bursters (GRBs) and only three soft γ-ray repeaters (SGRs). The latter are distinguished by theirExpand
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Centaurus X-3.
Spectroscopic observations of Krzeminski's star at dispersions 25-60 A/mm are described. The primary is an evolved star of type O6-O8(f) with peculiarities, some of which are attributable to X-rayExpand
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A γ-ray burst preceded by X-ray activity
GAMMA-RAY bursts remain mysterious astrophysical phenomena. The discovery of cyclotron harmonics1–3 in their spectra is strong evidence that they originate from strongly magnetized neutron stars, butExpand
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