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Papers by Patricia Boyd

Research paper thumbnail of Did LMC X-3 Undergo A

Research paper thumbnail of GRB060206 - swift UVOT confirmation of optical afterglow

Research paper thumbnail of The 2004 Anomalous Low State of Hercules X-1

Research paper thumbnail of Disentangling the Orbit from the Long-Term Variability in CYG X-2 with RXTE Monitoring

Research paper thumbnail of Monitoring the Black Hole Candidates LMC X-1 and LMC X-3 with RXTE

Astronomische Gesellschaft Meeting Abstracts, 2000

Research paper thumbnail of Regular and Irregular Motion in the Restricted Three-body Problem

Research paper thumbnail of Her X-1 Apparently Entering A New Anomalous Low State

Cultura organizacional y su importancia dentro de la formación en turismo 69 Cultura organizacion... more Cultura organizacional y su importancia dentro de la formación en turismo 69 Cultura organizacional y su importancia dentro de la formación en turismo Organizational culture and its importance within tourism Cultura organizacional e sua importância na formação em turismoçç

Research paper thumbnail of GRB 050410: early optical/ultraviolet observations with Swift/UVOT

Research paper thumbnail of GRB050922B: Swift-BAT detection of a weak long burst

Research paper thumbnail of GRB 050406: early observations with Swift-UVOT

Research paper thumbnail of Energy injection in GRB afterglows: The case of Swift GRBs 050401, 050801 and 050802

Il Nuovo Cimento B, 2006

Résumé/Abstract Swift unprecedented fast follow-up observations of gamma-ray bursts have allowed ... more Résumé/Abstract Swift unprecedented fast follow-up observations of gamma-ray bursts have allowed us to discover a new feature of GRB afterglows: a phase of shallow decay, usually attributed to energy injection in the burst ejecta, which can last for several thousands of ...

Research paper thumbnail of GRB 050318: Swift/UVOT detection of afterglow emission

Research paper thumbnail of GRB 050319: Swift-UVOT detection of the afterglow

Research paper thumbnail of GRB050215B: late-time swift UVOT observations

Research paper thumbnail of GRB050215a: no swift UVOT detection of afterglow emission

Research paper thumbnail of Swift UVOT observations of GRB 050701

Research paper thumbnail of Spectral And Timing Properties Of Swift J1626.6-5156 And RXTE J1710-281

We focus on two systems. The first is the Be/X-ray binary Swift J1626.6-5156, discovered in outbu... more We focus on two systems. The first is the Be/X-ray binary Swift J1626.6-5156, discovered in outburst by the Swift Burst Alert Telescope (BAT) in December 2005. Monitoring by the Rossi X-ray Timing Explorer (RXTE) has revealed a 45-day quasi-period in its long-term light curve, one cycle of which was observed in near-simultaneity by the Swift UV/optical Telescope (UVOT) and X-Ray

Research paper thumbnail of The First Swift Ultraviolet/Optical Telescope GRB Afterglow Catalog

The Astrophysical Journal, 2008

We present the first Swift Ultra-Violet/Optical Telescope (UVOT) gammaray burst (GRB) afterglow c... more We present the first Swift Ultra-Violet/Optical Telescope (UVOT) gammaray burst (GRB) afterglow catalog. The catalog contains data from over 64, 000 independent UVOT image observations of 229 GRBs first detected by Swift, the High Energy Transient Explorer 2 (HETE2), the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL), and the Interplanetary Network (IPN). The catalog covers GRBs occurring during the period from 2005 Jan 17 to 2007 Jun 16 and includes ∼ 86% of the bursts detected by the Swift Burst Alert Telescope (BAT). The catalog provides detailed burst positional, temporal, and photometric information extracted from each of the UVOT images. Positions for bursts detected at the 3σ-level are provided with a nominal accuracy, relative to the USNO-B1 catalog, of ∼ 0. ′′ 25. Photometry for each burst is given in three UV bands, three optical bands, and a 'white' or open filter. Upper limits for magnitudes are reported for sources detected below 3σ. General properties of the burst sample and light curves, including the filter-dependent temporal slopes, are also provided. The majority of the UVOT light curves, for bursts detected at

Research paper thumbnail of Topological analysis of chaotic orbits: Revisiting Hyperion

The Astrophysical Journal, 1994

Research paper thumbnail of GRB 060313: A New Paradigm for Short‐Hard Bursts?

The Astrophysical Journal, 2006

We report the simultaneous observations of the prompt emission in the gamma-ray and hard X-ray ba... more We report the simultaneous observations of the prompt emission in the gamma-ray and hard X-ray bands by the Swift BAT and the Konus-Wind instruments of the short-hard burst, GRB 060313. The observations reveal multiple peaks in both the gamma-ray and hard X-ray bands suggesting a highly variable outflow from the central explosion. We also describe the early-time observations of the X-ray and UV/optical afterglows by the Swift XRT and UVOT instruments. The combination of the X-ray and UV/optical observations provides the most comprehensive light curves to date of a short-hard burst at such an early epoch. The afterglows exhibit complex structure with different decay indices and flaring. This behavior can be explained by the combination of a structured jet, radiative loss of energy, and decreasing microphysics parameters occurring in a circumburst medium with densities varying by a factor of approximately two on a length scale of 10 17 cm. These density variations are normally associated with the environment of a massive star and inhomogeneities in its windy medium. However, the mean density of the observed medium (n $ 10 À4 cm 3) is much less than that expected for a massive star. Although the collapse of a massive star as the origin of GRB 060313 is unlikely, the merger of a compact binary also poses problems for explaining the behavior of this burst. Two possible suggestions for explaining this scenario are that some short bursts may arise from a mechanism that does not invoke the conventional compact binary model, or that soft late-time central engine activity is producing UV/optical but no X-ray flaring.

Research paper thumbnail of Did LMC X-3 Undergo A

Research paper thumbnail of GRB060206 - swift UVOT confirmation of optical afterglow

Research paper thumbnail of The 2004 Anomalous Low State of Hercules X-1

Research paper thumbnail of Disentangling the Orbit from the Long-Term Variability in CYG X-2 with RXTE Monitoring

Research paper thumbnail of Monitoring the Black Hole Candidates LMC X-1 and LMC X-3 with RXTE

Astronomische Gesellschaft Meeting Abstracts, 2000

Research paper thumbnail of Regular and Irregular Motion in the Restricted Three-body Problem

Research paper thumbnail of Her X-1 Apparently Entering A New Anomalous Low State

Cultura organizacional y su importancia dentro de la formación en turismo 69 Cultura organizacion... more Cultura organizacional y su importancia dentro de la formación en turismo 69 Cultura organizacional y su importancia dentro de la formación en turismo Organizational culture and its importance within tourism Cultura organizacional e sua importância na formação em turismoçç

Research paper thumbnail of GRB 050410: early optical/ultraviolet observations with Swift/UVOT

Research paper thumbnail of GRB050922B: Swift-BAT detection of a weak long burst

Research paper thumbnail of GRB 050406: early observations with Swift-UVOT

Research paper thumbnail of Energy injection in GRB afterglows: The case of Swift GRBs 050401, 050801 and 050802

Il Nuovo Cimento B, 2006

Résumé/Abstract Swift unprecedented fast follow-up observations of gamma-ray bursts have allowed ... more Résumé/Abstract Swift unprecedented fast follow-up observations of gamma-ray bursts have allowed us to discover a new feature of GRB afterglows: a phase of shallow decay, usually attributed to energy injection in the burst ejecta, which can last for several thousands of ...

Research paper thumbnail of GRB 050318: Swift/UVOT detection of afterglow emission

Research paper thumbnail of GRB 050319: Swift-UVOT detection of the afterglow

Research paper thumbnail of GRB050215B: late-time swift UVOT observations

Research paper thumbnail of GRB050215a: no swift UVOT detection of afterglow emission

Research paper thumbnail of Swift UVOT observations of GRB 050701

Research paper thumbnail of Spectral And Timing Properties Of Swift J1626.6-5156 And RXTE J1710-281

We focus on two systems. The first is the Be/X-ray binary Swift J1626.6-5156, discovered in outbu... more We focus on two systems. The first is the Be/X-ray binary Swift J1626.6-5156, discovered in outburst by the Swift Burst Alert Telescope (BAT) in December 2005. Monitoring by the Rossi X-ray Timing Explorer (RXTE) has revealed a 45-day quasi-period in its long-term light curve, one cycle of which was observed in near-simultaneity by the Swift UV/optical Telescope (UVOT) and X-Ray

Research paper thumbnail of The First Swift Ultraviolet/Optical Telescope GRB Afterglow Catalog

The Astrophysical Journal, 2008

We present the first Swift Ultra-Violet/Optical Telescope (UVOT) gammaray burst (GRB) afterglow c... more We present the first Swift Ultra-Violet/Optical Telescope (UVOT) gammaray burst (GRB) afterglow catalog. The catalog contains data from over 64, 000 independent UVOT image observations of 229 GRBs first detected by Swift, the High Energy Transient Explorer 2 (HETE2), the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL), and the Interplanetary Network (IPN). The catalog covers GRBs occurring during the period from 2005 Jan 17 to 2007 Jun 16 and includes ∼ 86% of the bursts detected by the Swift Burst Alert Telescope (BAT). The catalog provides detailed burst positional, temporal, and photometric information extracted from each of the UVOT images. Positions for bursts detected at the 3σ-level are provided with a nominal accuracy, relative to the USNO-B1 catalog, of ∼ 0. ′′ 25. Photometry for each burst is given in three UV bands, three optical bands, and a 'white' or open filter. Upper limits for magnitudes are reported for sources detected below 3σ. General properties of the burst sample and light curves, including the filter-dependent temporal slopes, are also provided. The majority of the UVOT light curves, for bursts detected at

Research paper thumbnail of Topological analysis of chaotic orbits: Revisiting Hyperion

The Astrophysical Journal, 1994

Research paper thumbnail of GRB 060313: A New Paradigm for Short‐Hard Bursts?

The Astrophysical Journal, 2006

We report the simultaneous observations of the prompt emission in the gamma-ray and hard X-ray ba... more We report the simultaneous observations of the prompt emission in the gamma-ray and hard X-ray bands by the Swift BAT and the Konus-Wind instruments of the short-hard burst, GRB 060313. The observations reveal multiple peaks in both the gamma-ray and hard X-ray bands suggesting a highly variable outflow from the central explosion. We also describe the early-time observations of the X-ray and UV/optical afterglows by the Swift XRT and UVOT instruments. The combination of the X-ray and UV/optical observations provides the most comprehensive light curves to date of a short-hard burst at such an early epoch. The afterglows exhibit complex structure with different decay indices and flaring. This behavior can be explained by the combination of a structured jet, radiative loss of energy, and decreasing microphysics parameters occurring in a circumburst medium with densities varying by a factor of approximately two on a length scale of 10 17 cm. These density variations are normally associated with the environment of a massive star and inhomogeneities in its windy medium. However, the mean density of the observed medium (n $ 10 À4 cm 3) is much less than that expected for a massive star. Although the collapse of a massive star as the origin of GRB 060313 is unlikely, the merger of a compact binary also poses problems for explaining the behavior of this burst. Two possible suggestions for explaining this scenario are that some short bursts may arise from a mechanism that does not invoke the conventional compact binary model, or that soft late-time central engine activity is producing UV/optical but no X-ray flaring.

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