The Lag-Luminosity Relation in the GRB Source Frame : An Investigation with Swift BAT Bursts

Author:: Sonbas, E.
Published:: July 15, 2011.
Physical Description:: 1 electronic document
Additional Creators:: Parke, William Carleton, Dermer, C. D., Maximon, L. C., Ukwatta, T. N., Abeysekara, A. U., Eskandarian, A., Linnemann, J. T., Norris, J. P., Sakamoto, T., Dhuga, K. S., Stamatikos, M., Tollefson, K., Bhat, P. N., and Gehrels, N.

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Summary:

Spectral lag. which is defined as the difference in time of arrival of high- and low-energy photons. is a common feature in gamma-ray bursts (GRBs). Previous investigations have shown a correlation between this lag and the isotropic peak luminosity for long duration bursts. However. most of the previous investigations used lags extracted in the observer frame only. In this work (based on a sample of 43 Swift long GRBs with known redshifts). we present an analysis of the lag-luminosity relation in the GRB source frame. Our analysis indicates a higher degree of correlation -0.82 +/- 0.05 (chance probability of approx. 5.5 x 10(exp -5) between the spectral lag and the isotropic peak luminosity, L(sub iso). with a best-fitting power-law index of -1.2 +/- 0.2. In addition, there is an anticorrelation between the source-frame spectral lag and the source-frame peak energy of the burst spectrum.

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Astrophysics

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NASA Technical Reports Server (NTRS) Collection.

Note:

Document ID: 20120016357.
GSFC.JA.7288.2012.
Monthly Notices of the Royal Astronomical Society; Volume 419; 614-623.

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