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Gamma-ray bursts: the dependence of the spectral lag on the energy

Published online by Cambridge University Press:  22 July 2013

P. Minaev
Affiliation:
Space Research Institute of the Russian Academy of Sciences, Moscow, Russia. e-mail: minaevp@mail.ru ;
A. Pozanenko
Affiliation:
Space Research Institute of the Russian Academy of Sciences, Moscow, Russia. e-mail: minaevp@mail.ru ;
S. Grebenev
Affiliation:
Space Research Institute of the Russian Academy of Sciences, Moscow, Russia. e-mail: minaevp@mail.ru ;
S. Molkov
Affiliation:
Space Research Institute of the Russian Academy of Sciences, Moscow, Russia. e-mail: minaevp@mail.ru ;
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Abstract

We investigated the dependence of a spectral lag against energy band based on 28 bright GRBs registered by SPI and IBIS/ISGRI of INTEGRAL observatory. It was found that for simple structure bursts or well separated pulses of multipulse bursts the spectral lag can be approximated by the relation of τ ~ Alg(E), where A is a positive parameter, which correlates with pulse duration. We have not found any negative lag in simple structure bursts or in well separated pulses. While investigating the time profile of the whole burst negative lag may appear due to different spectral parameters of the pulses.

Type
Research Article
Copyright
© EAS, EDP Sciences 2013

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References

Band, D., 1997, ApJ, 486, 928 CrossRef
Hakkila, J., & Preece, R., 2011, ApJ, 740, 104 CrossRef
Ubertini, P., Lebrun, F., Di Cocco, G., et al., 2003, A&A, 411, L131
Ukwatta, T., Dhuga, K., Stamatikos, M., et al., 2012, MNRAS, 419, 614 CrossRef
Vedrenne, G., Roques, J.-P., Schonfelder, V., et al., 2003, A&A, 411, L63
Winkler, C., Courvoisier, T., Di Cocco, G., et al., 2003, A&A, 411, L1-L6

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Gamma-ray bursts: the dependence of the spectral lag on the energy
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