An analytic model of Gamma-ray Burst pulse profiles

Details An analytic model of Gamma-ray Burst pulse profiles An analytic model of Gamma-ray Burst pulse profiles

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..586..623k&link_type=abstract

RELATIVISTIC ASTROPHYSICS: 20th Texas Symposium. AIP Conference Proceedings, Volume 586, pp. 623-625 (2001).

Astronomy and Astrophysics

Astrophysics

4

Gamma-Ray Sources, Gamma-Ray Bursts, Photography And Photometry, Mathematical Procedures And Computer Techniques

Scientific paper

Gamma-ray Bursts (GRBs) have puzzled astronomers for over three decades. Recent reports of correlations between a burst's lag and variability to redshift have begun to demonstrate how the analysis of a burst's temporal structure can play an important role in our understanding of this phenomenon. Here we attempt to derive an analytic function that is independent of an emission mechanism, that can then be used to model burst light curves in a unique way. We use this function to fit 22 clean non-overlapping fast rise exponential decay (FRED) bursts in an attempt to uncover temporal patterns that may exist among bursts. Using our model, we find that there appears to be a trend in the decay phase of the FRED profile. The parameter that is associated with the asymptotic decay slope of a GRB appears to remain constant among bursts of varying duration and intensity. Although it is not immediately clear what is driving this trend, it could be due to distinct dependencies of the rise and decay portions of the light curves on the physical conditions of the GRB progenitor. .

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