Explaining GRB Lag With Spectral Evolution

Details Explaining GRB Lag With Spectral Evolution Explaining GRB Lag With Spectral Evolution

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.x6006k&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

The spectral lag observed in Gamma-ray bursts (GRBs) has been shown by Norris et al. to be correlated to the absolute luminosity of a GRB. Despite the apparent importance of this GRB property, there has yet to be a full explanation of its origin. We put forth that the lag is directly due to the evolution of the GRB spectra. In particular, as the energy at which the GRB's ν F_ν spectra is a maximum (E_pk) decays through the four BATSE channels, the photon flux peak in each individual channel will inevitably be offset producing what we measure as lag. We test this hypothesis by measuring the E_pk decay constant Φo for a sample of clean single peaked bursts with known lag. We find a linear correlation between Φo and lag, demonstrating a direct relationship between lag and the decay of E_pk.

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