Journal article
A comprehensive study of GRB 070125, a most energetic gamma-ray burst
Astrophysical Journal, Vol.683(2), pp.924-942
Aug/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 wave bands. 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 used to derive an upper limit of 2: 4; 1017 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 windlike 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 GRB 070125 is a burst with high radiative efficiency (>60%).
Details
- Title
- A comprehensive study of GRB 070125, a most energetic gamma-ray burst
- Creators
- Poonam Chandra (null)S. Bradley Cenko (null)Dale A. Frail (null)Roger A. Chevalier (null)Jean-Pierre Macquart (null)Shri R. Kulkarni (null)Douglas C-J. Bock (null)Frank Bertoldi (null)Mansi Kasliwal (null)Derek B. Fox (null)Paul A. Price (null)Edo Berger (null)Alicia M. Soderberg (null)Fiona A. Harrison (null)Avishay Gal-Yam (null) - 972WIS_INST___88Eran O. Ofek (null)Arne Rau (null)Brian P. Schmidt (null)P. Brian Cameron (null)
- Resource Type
- Journal article
- Publication Details
- Astrophysical Journal, Vol.683(2), pp.924-942; Aug/2008
- Number of pages
- 19
- Language
- English
- DOI
- https://doi.org/10.1086/589807
- Grant note
- NASA [NNG06GJ33G]P. C. thanks the VLA staff for making radio observations, without which this work was not possible. P. C. is a Jansky Fellow at the National Radio Astronomy Observatory. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. We thank Sarah Yost for providing us with the GRB broadband modeling code and helping out in running the code. P. C. used the fussy calculator (http://fussy.googlecode.com) for error propagation calculations and wishes to thank its author, Sanjay Bhantagar. R. A. C. was supported in part by NASA grant NNG06GJ33G._ALMAME_DELIMITER_
- Record Identifier
- 993264461903596
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