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19 April 2024 |
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A comprehensive study of GRB 070125, a most energetic gamma ray burst | | Poonam Chandra
; S. Bradley Cenko
; Dale Frail
; Roger Chevalier
; Jean-Pierre Macquart
; Shri Kulkarni
; Douglas C.-J. Bock
; Frank Bertoldi
; Mansi Kasliwal
; Derek B. Fox
; Paul A. Price
; Edo Berger
; Alicia Soderberg
; Fiona A. Harrison
; Avishay Gal-Yam
; Eran Ofek
; Arne Rau
; Brian P. Schmidt
; P. Brian Cameron
; Lennox L. Cowie
; Antoinette Cowie
; Michael Dopita
; Bruce Peterson
; Bryan E. Penprase
; | | Date: |
20 Feb 2008 | | Abstract: | We present a comprehensive multiwavelength analysis of the bright, long
duration gamma-ray burst GRB 070125, comprised of observations in $gamma$-ray,
X-ray, optical, millimeter and centimeter wavebands. Simultaneous fits to the
optical and X-ray light curves favor a break on day 3.78, which we interpret as
the jet break from a collimated outflow. Independent fits to optical and X-ray
bands give similar results in the optical bands but shift the jet break to
around day 10 in the X-ray light curve. We show that for the physical
parameters derived for GRB 070125, inverse Compton scattering effects are
important throughout the afterglow evolution. While inverse Compton scattering
does not affect radio and optical bands, it may be a promising candidate to
delay the jet break in the X-ray band. Radio light curves show rapid flux
variations, which are interpreted as due to interstellar scintillation, and are
used to derive an upper limit of $2.4 imes 10^{17}$ cm on the radius of the
fireball in the lateral expansion phase of the jet. Radio light curves and
spectra suggest a high synchrotron self absorption frequency indicative of the
afterglow shock wave moving in a dense medium. Our broadband modeling favors a
constant density profile for the circumburst medium over a wind-like profile
($R^{-2}$). However, keeping in mind the uncertainty of the parameters, it is
difficult to unambiguously distinguish between the two density profiles. Our
broadband fits suggest that event is a burst with high radiative efficiency
($> 60 %$). | | Source: | arXiv, 0802.2748 | | Services: | Forum | Review | PDF | Favorites | |
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