Showing papers by "Royal Institute and Observatory of the Spanish Navy published in 2002"
TL;DR: In this paper, the analytic continuation of periodic orbits of conservative dynamical systems with three degrees of freedom is studied, where a predictor-corrector algorithm is used to compute the initial conditions of the periodic orbits pertaining to the family.
Abstract: This paper deals with the analytic continuation of periodic orbits of conservative dynamical systems with three degrees of freedom. For variations of any parameter (or integral), it relies on numerical analysis in order to implement a predictor-corrector algorithm to compute the initial conditions of the periodic orbits pertaining to the family. The method proposed here is not restricted to symmetric problems and, since the procedure involves the computation of the variational equations, a side effect is the trivial computation of the linear stability of the periodic orbits. As an illustration of the robustness of the method, several families of periodic orbits of the Restricted Three-Body Problem are computed.
81 citations
University of California, Berkeley1, California Institute of Technology2, International Trademark Association3, Spanish National Research Council4, Royal Institute and Observatory of the Spanish Navy5, Goddard Space Flight Center6, National Radio Astronomy Observatory7, University of Ferrara8, Clemson University9, Universities Space Research Association10, Lawrence Livermore National Laboratory11, Mount Stromlo Observatory12, Carnegie Learning13, University of Arizona14
TL;DR: In this article, the authors present interplanetary network localization, spectral and time history information for four short-duration, hard spectrum gamma-ray bursts, GRB 000607,GRB 001025B, GRBM 001204, and GRB 010119, followed up with sensitive radio and optical observations.
Abstract: We present interplanetary network localization, spectral, and time history information for four short-duration, hard spectrum gamma-ray bursts, GRB 000607, GRB 001025B, GRB 001204, and GRB 010119. All of these events were followed up with sensitive radio and optical observations (the first and only such bursts to be followed up in the radio to date), but no detections were made, demonstrating that the short bursts do not have anomalously intense afterglows. We discuss the upper limits and show that the lack of observable counterparts is consistent with both the hypothesis that the afterglow behavior of the short bursts is like that of the long-duration bursts, many of which similarly have no detectable afterglows, as well as the hypothesis that the short bursts have no detectable afterglows at all. Small number statistics do not allow a clear choice between these alternatives, but given the present detection rates of various missions, we show that progress can be expected in the near future.
54 citations
Spanish National Research Council1, International Trademark Association2, Royal Institute and Observatory of the Spanish Navy3, Danish Space Research Institute4, Czech Technical University in Prague5, Academy of Sciences of the Czech Republic6, Complutense University of Madrid7, University of Alicante8, Universities Space Research Association9, Institut Universitaire de France10, Masaryk University11
TL;DR: In this article, the error box of a gamma-ray burst of the short (0.5 s), hard type (GRB 000313) with the BOOTES-1 experiment in southern Spain, starting 4 min after the-ray event, in the I-band was found.
Abstract: We imaged the error box of a gamma-ray burst of the short (0.5 s), hard type (GRB 000313), with the BOOTES-1 experiment in southern Spain, starting 4 min after the-ray event, in the I-band. A bright optical transient (OT 000313) with I= 9:4 0:1 was found in the BOOTES-1 image, close to the error box (3) provided by BATSE. Late time VRIK 0 -band deep observations failed to reveal an underlying host galaxy. If the OT 000313 is related to the short, hard GRB 000313, this would be the first optical counterpart ever found for this kind of events (all counterparts to date have been found for bursts of the long, soft type). The fact that only prompt optical emission has been detected (but no afterglow emission at all, as supported by theoretical models) might explain why no optical counterparts have ever been found for short, hard GRBs. This fact suggests that most short bursts might occur in a low-density medium and favours the models that relate them to binary mergers in very low-density environments.
14 citations
Royal Institute and Observatory of the Spanish Navy1, Spanish National Research Council2, Danish Space Research Institute3, International Trademark Association4, University of Copenhagen5, European Southern Observatory6, University of Oulu7, University of A Coruña8, Michigan Technological University9, University of Nottingham10, University of Toronto11, Space Telescope Science Institute12, University of Amsterdam13, Goddard Space Flight Center14, Marshall Space Flight Center15, Clemson University16, University of California, Berkeley17, Lawrence Livermore National Laboratory18, University of Hertfordshire19, State University of New York System20, Steward Health Care System21
TL;DR: In this paper, the authors present optical follow up observations of the long GRB 001007 between 6.14 hours and ∼468 days after the event, showing that an unusually bright optical afterglow (OA) was seen to decline following a steep power law decay with index α = -2.03 ′ 0.11, possibly indicating a break in the light curve at t - t 0 < 3.5 days.
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 α = -2.03 ′ 0.11, possibly indicating a break in the light curve at t - t 0 < 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 (1.2σ) evidence for a break in the optical light curve. The spectral index β 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" (1.7σ) and 1.9" (2.7σ) from the afterglow position.
5 citations