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- W2019439499 abstract "The giant flare observed on 2004 December 27 from SGR 1806−20 has revived the idea that a fraction of short (<2 s) gamma-ray bursts (GRBs) are due to giant flares from soft gamma-ray repeaters (SGRs) located in nearby galaxies. One of the distinguishing characteristics of these events is the thermal (blackbody) spectrum with temperatures ranging from ∼50 to ∼180 keV, with the highest temperature observed for the initial 0.2-s spike of the 2004 December 27 event. We have analysed the spectra of a complete sample of short GRBs with peak fluxes greater than 4 photon s−1 cm−2 detected by BATSE. Of the 115 short GRBs so selected, only 76 had sufficient signal-to-noise ratio to allow the spectral analysis. We find only three short GRBs with a spectrum well fitted by a blackbody, with 60 ≲kT≲ 90 keV, albeit with a considerably longer duration (i.e. ≳1 s) and a more complex light curve than the 2004 December 27 event. This implies a stringent limit on the rate of extragalactic SGR giant flares with spectral properties analogous to the December 27 flare. We conclude that up to 4 per cent of the short GRBs could be associated with giant flares (2σ confidence). This implies that either the distance to SGR 1806−20 is smaller than 15 kpc or the rate of Galactic giant flares is lower than the estimated 0.033 yr−1." @default.
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- W2019439499 date "2005-09-01" @default.
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- W2019439499 title "Soft gamma-ray repeater giant flares in the BATSE short gamma-ray burst catalogue: constraints from spectroscopy" @default.
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- W2019439499 doi "https://doi.org/10.1111/j.1745-3933.2005.00062.x" @default.
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