Soft Gamma Repeater 1806-20: Weak Evidence for a Periodicity following the Bursts

Details Soft Gamma Repeater 1806-20: Weak Evidence for a Periodicity following the Bursts Soft Gamma Repeater 1806-20: Weak Evidence for a Periodicity following the Bursts

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...418..395u&link_type=abstract

Astrophysical Journal v.418, p.395

Astronomy and Astrophysics

Astronomy

23

Gamma Rays: Bursts, Stars: Individual Alphanumeric: Sgr 1806-20, X-Rays: Stars

Scientific paper

The study of soft gamma repeaters began with the detection of the soft gamma-ray burst of 1979 March 5 that was followed by long-lasting 8 s pulsations. Later weaker bursts were detected from the same source, although they did not exhibit detectable pulsations. Here we analyze data from the UCB/Los Alamos experiment on the International Cometary Explorer (ICE) of a different soft gamma repeater, SGR 1806-20. A search for periodicities in data following the bursts showed a signal at 2.8 s. The probability that a periodic signal of this size would occur by chance somewhere in the power spectrum is ˜1.3%. The detected amplitude is ˜25 times weaker than what would result if the SGR 1806-20 bursts were simply scaled-down replicas of the March 5th event.

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