Timing diagrams and correlated pulses in GRBs

Details Timing diagrams and correlated pulses in GRBs Timing diagrams and correlated pulses in GRBs

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..312..114m&link_type=abstract

Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era ASP Conference Series, Volume 312, Proceedings of the conference he

Astronomy and Astrophysics

Astronomy

Scientific paper

The temporal properties of a large sample of bright gamma-ray bursts (GRBs) with durations between 0.05 s and 674 s were obtained. The large range in duration (T90) is accompanied by a similarly large range in the median values of the pulse timing properties including rise time, fall time, FWHM and separation between the pulses. Four timing diagrams relating these pulse properties to T90 are presented and show the power law relationships between the median values of the four pulse timing properties and T90, but also that the power laws depend in a consistent manner on the number of pulses per GRB. The timing diagrams are caused by the correlated properties of the pulses in the burst and can be explained by a combination of factors including the Doppler boost factor Γ, a jet and emission from below the photosphere. GRBs with similar values of T90 have a wide range in the number of pulses. The pulses in GRBs have seven distinctive statistical properties including correlations between sucessive time intervals, correlations between sucessive pulse amplitudes, an anticorrelation between pulse amplitudes and adjacent time intervals. The timing diagrams and correlated pulses suggest that GRBs are powered by accretion processes signalling jets from the formation of black holes.

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