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The Giant X-ray Flare of GRB 050502B: Evidence for Late-Time Internal Engine Activity
A. D. Falcone, D. N. Burrows, D. Lazzati +28
Until recently, X-ray flares during the afterglow of gamma ray bursts (GRBs) were a rarely detected phenomenon, thus their nature is unclear. During the afterglow of GRB 050502B, t…
Swift and XMM observations of the dark GRB 050326
A. Moretti, A. De Luca, D. Malesani +30
We present Swift and XMM observations of GRB 050326, detected by Swift-BAT. The fluence was 7.7x10^-6 erg cm^-2 (20-150 keV), and its spectrum was hard, with a power law photon ind…
Evidence for intrinsic absorption in the Swift X-ray afterglows
S. Campana, P. Romano, S. Covino +29
Gamma-ray burst (GRB) progenitors are observationally linked to the death of massive stars. X-ray studies of the GRB afterglows can deepen our knowledge of the ionization status an…
A refined position catalog of the Swift XRT afterglows
A. Moretti, M. Perri, M. Capalbi +22
We present a catalogue of refined positions of 68 gamma ray burst (GRB) afterglows observed by the Swift X-ray Telescope (XRT) from the launch up to 2005 Oct 16. This is a result o…
Swift XRT Observations of X-ray Flares in GRB Afterglows
David N. Burrows, P. Romano, O. Godet +18
The Swift XRT has been observing GRB afterglows since December 23, 2004. Three-quarters of these observations begin within 300 s of the burst onset, providing an unprecendented loo…
Swift observations of the X-ray bright GRB 050315
S. Vaughan, M. R. Goad, A. P. Beardmore +30
This paper discusses Swift observations of the gamma-ray burst GRB 050315 (z=1.949) from 80 s to 10 days after the onset of the burst. The X-ray light curve displayed a steep early…
GRB 050117: Simultaneous Gamma-ray and X-ray Observations with the Swift Satellite
J. E. Hill, D. C. Morris, T. Sakamoto +32
The Swift Gamma-Ray Burst Explorer performed its first autonomous, X-ray follow-up to a newly detected GRB on 2005 January 17, within 193 seconds of the burst trigger by the Swift…
GAW, Gamma Air Watch - A Large Field of View Imaging Atmospheric Cherenkov
M. C. Maccarone, G. Agnetta, P. Assis +26
GAW, acronym for Gamma Air Watch, is a path-finder experiment to test the feasibility of a new generation of imaging atmospheric Cherenkov telescopes that join high flux sensitivit…
Swift XRT Observations of the Afterglow of GRB 050319
G. Cusumano, V. Mangano, L. Angelini +27
Swift discovered the high redshift GRB 050319 with the Burst Alert Telescope and began observing with its narrow field instruments only 225 s after the burst onset. The afterglow X…
Swift XRT Observations of the Breaking X-ray Afterglow of GRB 050318
M. Perri, P. Giommi, M. Capalbi +26
We report the results of Swift X-Ray Telescope (XRT) observations of GRB 050318. This event triggered the Burst Alert Telescope (BAT) aboard Swift and was followed-up with XRT and…
Bright X-ray Flares in Gamma-Ray Burst Afterglows
D. N. Burrows, P. Romano, A. Falcone +31
Gamma-ray burst (GRB) afterglows have provided important clues to the nature of these massive explosive events, providing direct information on the nearby environment and indirect…
GRB050223: A faint Gamma-Ray Burst discovered by Swift
K. L. Page, E. Rol, A. J. Levan +16
GRB050223 was discovered by the Swift Gamma-Ray Burst Explorer on 23 February 2005 and was the first Gamma-Ray Burst to be observed by both Swift and XMM-Newton. At the time of wri…
An unexpectedly rapid decline in the X-ray afterglow emission of long gamma-ray bursts
G. Tagliaferri, M. Goad, G. Chincarini +32
Long gamma-ray bursts (GRBs) are commonly accepted to originate in the explosion of particularly massive stars, which gives rise to a highly relativistic jet. Internal inhomogeneit…
Prompt and afterglow early X-ray phases in the comoving frame. Evidence for Universal properties?
G. Chincarini, A. Moretti, P. Romano +38
We analyze the Swift XRT light curves and spectra of the gamma-ray bursts (GRBs) for which the redshift has been measured. The sample consists of seven GRBs. The soft X-ray light c…
The extended hard X-ray emission from the Vela Plerion
V. Mangano, E. Massaro, F. Bocchino +2
We present the results of a broad band (3-200 keV) spectral analysis of BeppoSAX and XMM-Newton observations of the Vela plerion. The hard X-ray (> 15 keV) emission is found to be…
Swift XRT and VLT Observations of the Afterglow of GRB 041223
David N. Burrows, Joanne E. Hill, Guido Chincarini +30
The Swift Gamma-Ray Burst Explorer, launched on 2004 November 20, is a multiwavelength, autonomous, rapid-slewing observatory for gamma-ray burst (GRB) astronomy. On 2004 December…