Swift observations of GRB050128: the early X-ray afterglow
Astrophysics
2010-03-19 v1
Abstract
Swift discovered GRB050128 with the Burst Alert Telescope and promptly pointed its narrow field instruments to monitor the afterglow. X-ray observations started 108 s after the trigger time. The early decay of the afterglow is relatively flat with a temporal decay modeled with a power law with index ~ -0.3. A steepening occurs at later times (~ 1500 s) with a power law index of ~ -1.3. During this transition, the observed X-ray spectrum does not change. We interpret this behaviour as either an early jet break or evidence for a transition from the fast cooling regime to the slow cooling regime in a wind environment.
Keywords
Cite
@article{arxiv.astro-ph/0504331,
title = {Swift observations of GRB050128: the early X-ray afterglow},
author = {S. Campana and L. A. Antonelli and G. Chincarini and S. Covino and G. Cusumano and D. Malesani and V. Mangano and A. Moretti and C. Pagani and P. Romano and G. Tagliaferri and M. Capalbi and M. Perri and P. Giommi and L. Angelini and P. Boyd and D. N. Burrows and J. E. Hill and C. Gronwall and J. A. Kennea and S. Kobayashi and P. Kumar and P. Meszaros and J. A. Nousek and P. W. A. Roming and B. Zhang and A. F. Abbey and A. P. Beardmore and A. Breeveld and M. R. Goad and O. Godet and K. O. Mason and J. P. Osborne and K. L. Page and T. Poole and N. Gehrels},
journal= {arXiv preprint arXiv:astro-ph/0504331},
year = {2010}
}
Comments
Accepted for publication on ApJL (4 pages + 3 figures)