Connection between spectral lags and peak luminosity in GRBs

Details Connection between spectral lags and peak luminosity in GRBs Connection between spectral lags and peak luminosity in GRBs

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..526...78n&link_type=abstract

GAMMA-RAY BURSTS: 5th Huntsville Symposium. AIP Conference Proceedings, Volume 526, pp. 78-82 (2000).

Physics

4

Gamma-Ray Sources, Gamma-Ray Bursts, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Cosmic Rays, Observational Cosmology

Scientific paper

For the set of six gamma-ray bursts with redshifts observed by BeppoSAX and CGRO/BATSE, their isotropic peak luminosities and spectral lags are anti-correlated. In this small set of bursts, the relationship is approximated by a power-law, L53~1.3×(τ/0.01 s)-1.15. While GRB 980425 (if associated with SN 1998bw) would appear to extend this trend qualitatively, it falls below the power-law relationship by a factor of several hundred. The same underlying anti-correlation, but apparently convolved with redshift, appears to be manifest in the 30% brightest BATSE bursts-dimmer bursts tend to have longer spectral lags. These results appear to lend at least empirical meaning to the GRB pulse paradigm:short spectral lag and therefore narrow pulse width are somehow related to high luminosity. .

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