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

P. Minaev; A. Pozanenko; S. Grebenev; S. Molkov

doi:10.1051/eas/1361010

All issues

Volume 61 (2013)

EAS Publications Series, 61 (2013) 75-78

Abstract

Issue		EAS Publications Series Volume 61, 2013 Gamma-ray Bursts: 15 Years of GRB Afterglows – Progenitors, Environments and Host Galaxies from the Nearby to the Early Universe


Page(s)		75 - 78
Section		Chapter II: Prompt Emission-I Observations
DOI		https://doi.org/10.1051/eas/1361010
Published online		22 July 2013

Gamma-ray Bursts: 15 Years of GRB Afterglows
A.J. Castro-Tirado, J.Gorosabel and I.H. Park (eds)
EAS Publications Series, 61 (2013) 75-78

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

P. Minaev, A. Pozanenko, S. Grebenev and S. Molkov

Space Research Institute of the Russian Academy of Sciences, Moscow, Russia ;
e-mail: minaevp@mail.ru

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.