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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…
Swift observations of the prompt X-ray emission and afterglow from GRB050126 and GRB050219A
M. R. Goad
We report on the temporal and spectral characteristics of the early X-ray emission from the Gamma Ray Bursts GRB050126 and GRB050219A as observed by Swift. The X-ray light-curves o…
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…
Log-parabolic spectra and particle acceleration in blazars. III: SSC emission in the TeV band from Mkn 501
E. Massaro, A. Tramacere, M. Perri +2
Curved broad-band spectral distributions of non-thermal sources like blazars are described well by a log-parabolic (LP) law where the second degree term measures the curvature. LP…
XRT Light curves: Morphology, Flares and Energy
G. Chincarini, V. Mangano, A. Moretti +10
Following a brief introduction we show that the observations obtained so far with the Swift satellite begin to shed light over a variety of problems that were left open following t…
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…
The in-flight spectroscopic performance of the Swift XRT CCD camera
J. P. Osborne, A. P. Beardmore, O. Godet +23
The Swift X-ray Telescope (XRT) focal plane camera is a front-illuminated MOS CCD, providing a spectral response kernel of 144 eV FWHM at 6.5 keV. We describe the CCD calibration p…
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…
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…
Non-thermal Cosmic Backgrounds from Blazars: the contribution to the CMB, X-ray and gamma-ray Backgrounds
P. Giommi, S. Colafrancesco, E. Cavazzuti +2
We present a new assessment of the contribution of Blazars to the extragalactic background radiation across the e.m. spectrum. Our calculations rely on deep Blazar radio counts tha…
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…
Swift panchromatic observations of the bright gamma-ray burst GRB050525a
A. J. Blustin, D. Band, S. Barthelmy +12
The bright gamma-ray burst GRB050525a has been detected with the Swift observatory, providing unique multiwavelength coverage from the very earliest phases of the burst. The X-ray…
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…
A short gamma-ray burst apparently asssociated with an elliptical galaxy at redshift z=0.225
N. Gehrels
Gamma Ray Bursts (GRBs) are bright, brief flashes of high energy photons that have fascinated scientists for 30 years. They come in two classes: long (>2 s), softspectrum bursts an…
Swift observations of GRB050128: the early X-ray afterglow
S. Campana, L. A. Antonelli, G. Chincarini +33
Swift discovered GRB050128 with the Burst Alert Telescope and promptly pointed its narrow field instruments to monitor the afterglow. X-ray observations started 108 s after the tri…