Prevalence of Extended Emission in Short GRBs

Details Prevalence of Extended Emission in Short GRBs Prevalence of Extended Emission in Short GRBs

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1000..280n&link_type=abstract

GAMMA-RAY BURSTS 2007: Proceedings of the Santa Fe Conference. AIP Conference Proceedings, Volume 1000, pp. 280-283 (2008).

Astronomy and Astrophysics

Astronomy

10

Gamma-Ray Sources, Gamma-Ray Bursts, Astronomical And Space-Research Instrumentation, Unusual And Peculiar Variables

Scientific paper

The soft, low-intensity component persisting for tens of seconds after the much more intense initial pulse complex (IPC) in short bursts is apparent in both the BATSE and Swift/BAT samples. This extended emission (EE) component is present in ~25% of BAT and BATSE short bursts. The average principle properties of IPCs of short bursts with and without EE are indistin-guishable, suggesting that short bursts are ``unified''. In most short bursts with EE the ratio of average EE flux to peak IPC flux ranges over R~10-3-5×10-2. A statistical treatment of the BATSE sample, and calibration of the BAT sensitivity to the EE component, suggest that R~10-3 may be the lower cutoff-that ~3/4 of short GRBs are truly short with no EE.

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