skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: LUMINOSITY CORRELATIONS FOR GAMMA-RAY BURSTS AND IMPLICATIONS FOR THEIR PROMPT AND AFTERGLOW EMISSION MECHANISMS

Abstract

We present the relation between the (z- and k-corrected) spectral lags, {tau}, for the standard Swift energy bands 50-100 keV and 100-200 keV and the peak isotropic luminosity, L{sub iso} (a relation reported first by Norris et al.), for a subset of 12 long Swift gamma-ray bursts (GRBs) taken from a recent study of this relation by Ukwatta et al. The chosen GRBs are also a subset of the Dainotti et al. sample, a set of Swift GRBs of known redshift, employed in establishing a relation between the (GRB frame) luminosity, L{sub X} , of the shallow (or constant) flux portion of the typical X-Ray Telescope GRB-afterglow light curve and the (GRB frame) time of transition to the normal decay rate, T{sub brk}. We also present the L{sub X} -T{sub brk} relation using only the bursts common in the two samples. The two relations exhibit a significant degree of correlation ({rho} = -0.65 for the L{sub iso}-{tau} and {rho} = -0.88 for the L{sub X} -T{sub brk} relation) and have surprisingly similar best-fit power-law indices (-1.19 {+-} 0.17 for L{sub iso}-{tau} and -1.10 {+-} 0.03 for L{sub X} -T{sub brk}). Even more surprisingly, we noted that although {tau} and T{submore » brk} represent different GRB time variables, it appears that the first relation (L{sub iso}-{tau}) extrapolates into the second one for timescales {tau} {approx_equal} T{sub brk}. This fact suggests that these two relations have a common origin, which we conjecture to be kinematic. This relation adds to the recently discovered relations between properties of the prompt and afterglow GRB phases, indicating a much more intimate relation between these two phases than hitherto considered.« less

Authors:
 [1];
  1. Mathematics Department, Faculty of Science, University of Malta, Msida MSD2080 (Malta)
Publication Date:
OSTI Identifier:
22092091
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 758; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AFTERGLOW; ASTROPHYSICS; CORRELATIONS; COSMIC GAMMA BURSTS; GAMMA ASTRONOMY; KEV RANGE; LUMINOSITY; RED SHIFT; VISIBLE RADIATION; X RADIATION

Citation Formats

Sultana, J., Kazanas, D., and Fukumura, K., E-mail: joseph.sultana@um.edu.mt. LUMINOSITY CORRELATIONS FOR GAMMA-RAY BURSTS AND IMPLICATIONS FOR THEIR PROMPT AND AFTERGLOW EMISSION MECHANISMS. United States: N. p., 2012. Web. doi:10.1088/0004-637X/758/1/32.
Sultana, J., Kazanas, D., & Fukumura, K., E-mail: joseph.sultana@um.edu.mt. LUMINOSITY CORRELATIONS FOR GAMMA-RAY BURSTS AND IMPLICATIONS FOR THEIR PROMPT AND AFTERGLOW EMISSION MECHANISMS. United States. https://doi.org/10.1088/0004-637X/758/1/32
Sultana, J., Kazanas, D., and Fukumura, K., E-mail: joseph.sultana@um.edu.mt. 2012. "LUMINOSITY CORRELATIONS FOR GAMMA-RAY BURSTS AND IMPLICATIONS FOR THEIR PROMPT AND AFTERGLOW EMISSION MECHANISMS". United States. https://doi.org/10.1088/0004-637X/758/1/32.
@article{osti_22092091,
title = {LUMINOSITY CORRELATIONS FOR GAMMA-RAY BURSTS AND IMPLICATIONS FOR THEIR PROMPT AND AFTERGLOW EMISSION MECHANISMS},
author = {Sultana, J. and Kazanas, D. and Fukumura, K., E-mail: joseph.sultana@um.edu.mt},
abstractNote = {We present the relation between the (z- and k-corrected) spectral lags, {tau}, for the standard Swift energy bands 50-100 keV and 100-200 keV and the peak isotropic luminosity, L{sub iso} (a relation reported first by Norris et al.), for a subset of 12 long Swift gamma-ray bursts (GRBs) taken from a recent study of this relation by Ukwatta et al. The chosen GRBs are also a subset of the Dainotti et al. sample, a set of Swift GRBs of known redshift, employed in establishing a relation between the (GRB frame) luminosity, L{sub X} , of the shallow (or constant) flux portion of the typical X-Ray Telescope GRB-afterglow light curve and the (GRB frame) time of transition to the normal decay rate, T{sub brk}. We also present the L{sub X} -T{sub brk} relation using only the bursts common in the two samples. The two relations exhibit a significant degree of correlation ({rho} = -0.65 for the L{sub iso}-{tau} and {rho} = -0.88 for the L{sub X} -T{sub brk} relation) and have surprisingly similar best-fit power-law indices (-1.19 {+-} 0.17 for L{sub iso}-{tau} and -1.10 {+-} 0.03 for L{sub X} -T{sub brk}). Even more surprisingly, we noted that although {tau} and T{sub brk} represent different GRB time variables, it appears that the first relation (L{sub iso}-{tau}) extrapolates into the second one for timescales {tau} {approx_equal} T{sub brk}. This fact suggests that these two relations have a common origin, which we conjecture to be kinematic. This relation adds to the recently discovered relations between properties of the prompt and afterglow GRB phases, indicating a much more intimate relation between these two phases than hitherto considered.},
doi = {10.1088/0004-637X/758/1/32},
url = {https://www.osti.gov/biblio/22092091}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 758,
place = {United States},
year = {Wed Oct 10 00:00:00 EDT 2012},
month = {Wed Oct 10 00:00:00 EDT 2012}
}