Other
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1358..158p&link_type=abstract
GAMMA RAY BURSTS 2010. AIP Conference Proceedings, Volume 1358, pp. 158-161 (2011).
Other
Gamma-Rays, Shock Waves, Telescopes, Redshift, Gamma-Ray, Planetary Bow Shocks, Interplanetary Shocks, X- And Gamma-Ray Telescopes And Instrumentation, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies
Scientific paper
Early observations of 15 GRB afterglows taken (2008-09) by ROTSE-III along with the published data of 26 others have been used to study the rising temporal nature seen at optical frequencies. A good fraction of early time temporal rising indices found to be flatter than the model predicted values. Under the assumptions of ``onset of the afterglow'', the peak times of the rising optical light curves have been used to estimate the initial Lorentz factor Γ0 of the fireball, ranging from ~100 to ~1000. The estimated values of Γ0 seems correlated with the isotropic equivalent gamma-ray energies of GRBs i.e. highly energetic GRBs have higher values of Γ0. The analysis also indicates that for a larger sample of GRBs, the peak times of the rising afterglow light curves and the derived values of the initial Lorentz factors along with the respective prompt emission properties like Epeak can be used to better constrain possible scenarios like off-axis emission and structured outflow.
Akerlof Carl W.
McKay Timothy A.
Pandey Shashi Bhushan
Rykoff Eli S.
Yuan Fang-Fang
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