1203.1228 (Shlomo Dado et al.)

Correlated Spectral And Temporal Behaviour Of Late-Time Afterglows Of Gamma Ray Bursts    [PDF]

Shlomo Dado, Arnon Dar

The late-time afterglows of Gamma ray bursts (GRBs) have a spectral energy density that declines like a power-law in time and in frequency. We show that the observed distribution of the difference between the temporal and spectral power-law indexes of the late-time X-ray afterglow of 322 GRBs which were measured accurately enough with the Swift X-ray telescope (Swift/XRT) has three narrow peaks around 0, 1/2 and 1 whose widths are consistent with being due to the measurement errors. The cannonball model of GRBs, so far, is the only model of GRBs that predicts this behaviour.

View original: http://arxiv.org/abs/1203.1228