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Evidence for a Canonical Gamma-Ray Burst Afterglow Light Curve in the Swift XRT Data
We present new observations of the early X-ray afterglows of the first 27 gamma-ray bursts (GRBs) well observed by the Swift X-Ray Telescope (XRT). The early X-ray afterglows show a canonicalExpand
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An origin for short γ-ray bursts unassociated with current star formation
Two short (< 2 s) γ-ray bursts (GRBs) have recently been localized and fading afterglow counterparts detected. The combination of these two results left unclear the nature of the host galaxies of theExpand
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The prelude to and aftermath of the giant flare of 2004 December 27: persistent and pulsed X-Ray properties of SGR 1806-20 from 1993 to 2005
We report on the evolution of key spectral and temporal parameters of SGR 1806-20 prior to and following the highly energetic giant flare of 2004 December 27. Using RXTE, we track the pulse frequencyExpand
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Galaxy Cluster Gas Mass Fractions from Sunyaev-Zeldovich Effect Measurements: Constraints on ΩM
Using sensitive centimeter-wave receivers mounted on the Owens Valley Radio Observatory and Berkeley-Illinois-Maryland-Association millimeter arrays, we have obtained interferometric measurements ofExpand
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The Mass, Baryonic Fraction, and X-Ray Temperature of the Luminous, High-Redshift Cluster of Galaxies MS 0451.6–0305
We present new Chandra X-ray observations of the luminous and cosmologically significant X-ray cluster of galaxies, MS 0451.6-0305, at z = 0.5386. Spectral imaging data for the cluster are consistentExpand
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Jet Breaks in Short Gamma-Ray Bursts. II. The Collimated Afterglow of GRB 051221A
We report the results of the Chandra observations of the Swift-discovered short gamma-ray burst GRB 050724. Chandra observed this burst twice, about 2 days after the burst and a second time 3 weeksExpand
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Chandra Observations of the Anomalous X-Ray Pulsar 4U 0142+61
We present X-ray imaging, timing, and phase-resolved spectroscopy of the anomalous X-ray pulsar 4U 0142+61 using the Chandra X-Ray Observatory. The spectrum is well described by a power-law plusExpand
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Chandra Observations of the Anomalous X-Ray Pulsar 1E 2259+586
We present X-ray imaging, timing, and phase-resolved spectroscopy of the anomalous X-ray pulsar 1E 2259+586 using the Chandra X-Ray Observatory. The spectrum is well described by a power-law plusExpand
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The Burst Cluster: Dark Matter in a Cluster Merger Associated with the Short Gamma-Ray Burst, GRB 050509B
We have identified a merging galaxy cluster with evidence of two distinct subclusters. The X-ray and optical data suggest that the subclusters are presently moving away from each other after closestExpand
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A Possible Faint Near-Infrared Counterpart to the Anomalous X-Ray Pulsar 1E 2259+586
We present near-infrared and optical observations of the field of the anomalous X-ray pulsar 1E 2259+586 taken with the Keck telescope. We derive a subarcsecond Chandra position and tie it to ourExpand
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