The bright optical afterglow of the long GRB 001007
Abstract
We present optical follow up observations of the long GRB 001007 between 6.14 hours and ~468 days after the event. An unusually bright optical afterglow (OA) was seen to decline following a steep power law decay with index alpha = -2.03 +/- 0.11, possibly indicating a break in the light curve at t - to < 3.5 days, as found in other bursts. Upper limits imposed by the LOTIS alerting system 6.14 hours after the gamma ray event provide tentative (1.2 sigma) evidence for a break in the optical light curve. The spectral index beta of the OA yields -1.24 +/- 0.57. These values may be explained both by several fireball jet models and by the cannonball model. Fireball spherical expansion models are not favoured. Late epoch deep imaging revealed the presence of a complex host galaxy system, composed of at least two objects located 1.2" (1.7 sigma) and 1.9" (2.7 sigma) from the afterglow position.
Cite
@article{arxiv.astro-ph/0110049,
title = {The bright optical afterglow of the long GRB 001007},
author = {J. M. Castro Cerón and A. J. Castro-Tirado and J. Gorosabel and J. Hjorth and J. U. Fynbo and B. L. Jensen and H. Pedersen and M. I. Andersen and M. López-Corredoira and O. Suárez and Y. Grosdidier and J. Casares and D. Pérez-Ramírez and B. Milvang-Jensen and G. Mallén-Ornelas and A. Fruchter and J. Greiner and E. Pian and P. M. Vreeswijk and S. D. Barthelmy and T. Cline and F. Frontera and L. Kaper and S. Klose and C. Kouveliotou and D. H. Hartmann and K. Hurley and N. Masetti and E. Mazets and E. Palazzi and H. S. Park and E. Rol and I. Salamanca and N. Tanvir and J. I. Trombka and R. A. M. J. Wijers and G. G. Williams and E. van den Heuvel},
journal= {arXiv preprint arXiv:astro-ph/0110049},
year = {2007}
}
Comments
7 pages, 5 figures, published in A&A