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Advances in High Energy Physics
Volume 2014 (2014), Article ID 597384, 16 pages
http://dx.doi.org/10.1155/2014/597384
Research Article

Quantum-Spacetime Scenarios and Soft Spectral Lags of the Remarkable GRB130427A

1Dipartimento di Fisica, Sapienza Università di Roma and INFN, Sez. Roma1, P.le A. Moro 2, 00185 Roma, Italy
2INAF-Osservatorio Astronomico di Roma, Via Frascati 33, 00040 Monteporzio Catone, Italy
3Department of Physics, ORT Braude, Snunit 51 Street P.O. Box 78, 21982 Karmiel, Israel
4ASI Science Data Center, Via Galileo Galilei, 00044 Frascati, Italy

Received 2 October 2013; Accepted 25 November 2013; Published 20 January 2014

Academic Editor: Piero Nicolini

Copyright © 2014 Giovanni Amelino-Camelia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.

Abstract

We process the Fermi LAT data on GRB130427A using the Fermi Science Tools, and we summarize some of the key facts that render this observation truly remarkable. We then perform a search of spectral lags, of the type that has been of interest for its relevance in quantum-spacetime research. We do find some evidence of systematic soft spectral lags: when confining the analysis to photons of energies greater than 5 GeV there is an early hard development of minibursts within the burst. The effect is well characterized by a linear dependence, within such a miniburst, of the detection time on energy. We also observe that some support for these features is noticeable also in earlier Fermi-LAT GRBs. Some aspects of the comparison of these features for GRBs at different redshifts could be described within a quantum-spacetime picture, but taking into account results previously obtained by other studies we favour the interpretation as intrinsic properties of GRBs. Even if our spectral lags do turn out to have astrophysical origin their understanding will be important for quantum-spacetime research, since any attempt to reveal minute quantum-spacetime-induced spectral lags evidently requires a good understanding of intrinsic mechanisms at the sources that can produce spectral lags.