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Originally Posted by renormalised
The other explanation also has to do with the graininess of spacetime and how the gamma rays emitted from the GRB interact with spacetime in their journey to the detectors.
In any case, the emission mechanism could easily explain why, as they have mentioned. The more powerful gamma rays are emitted during the peak of the explosion, with the weaker gamma rays being emitted during the tailing off of the explosion.
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Its interesting that they also predict another effect which results from torsion induced by momentum phase space called 'dual gravitational lensing' … from their paper:
Gamma ray burst delay times probe the geometry of momentum space (Mar 2011):
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This result shows that in the presence of torsion even if the two photons which are emitted in parallel and at the same time are detected at the same time, they appear to be coming from two different directions in the sky. The difference is proportional to the average photon energy. We may call this effect dual gravitational lensing.
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There's quite a lot of thinking that's gone into all this.
The other key paper behind it all is:
The principle of relative locality (Jan 2011).
Cheers