Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21710803n&link_type=abstract
American Astronomical Society, AAS Meeting #217, #108.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The initial pulse complex (IPC) in short gamma-ray bursts is sometimes accompanied by a softer, low-intensity extended emission (EE) component. In cases where such a component is not observed, it has not been clear if it is present but below detection threshold. Using Bayesian Block methods, we have measured the EE component and shown that it is present in one quarter of a Swift/BAT sample of 51 short bursts. We simulated bursts with EE to calibrate the BAT threshold for EE detection. The EE component would have been detected in nearly half of BAT short bursts if it were present, to intensities 10-2 counts cm-2 s-1, a factor of five lower than actually observed in the bursts with EE. The 2-sigma upper on the ratio, Rint = average EE intensity to IPC peak intensity, for the average of those 39 bursts without an EE component, is Rint < 8 x 10-4.
Our results (ApJ, 717, 2010) suggest that a physical threshold mechanism operates near Rint few x 10-3 - below which the EE component is not manifest - but do not necessarily favor two different progenitors for short bursts.
Gehrels Neil
Norris Jay P.
Scargle Jeffrey D.
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