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25 papers · 2 filters
X-ray spectral evolution of TeV BL Lac objects: eleven years of observations with BeppoSAX, XMM-Newton and SWIFT satellites
F. Massaro, A. Tramacere, A. Cavaliere +2
Many of the extragalactic sources detected in rays at TeV energies are BL Lac objects. In particular, they belong to the subclass of ``high frequency peaked BL Lacs" (HBLs), as…
A Search for Synchrotron X-ray Emission in Radio Quasars
Hermine Landt, Paolo Padovani, Paolo Giommi +2
This paper presents XMM-Newton and Chandra X-ray spectroscopy of ten flat-spectrum radio quasars (FSRQ) which are candidates to have an X-ray spectrum dominated by jet synchrotron…
Swift captures the spectrally evolving prompt emission of GRB 070616
R. L. C. Starling, P. T. O'Brien, R. Willingale +14
The origins of Gamma-ray Burst prompt emission are currently not well understood and in this context long, well-observed events are particularly important to study. We present the…
The 26 year-long X-ray light curve and the X-ray spectrum of the BL Lac Object 1E 1207.9+3945 in its brightest state
A. Maselli, P. Giommi, M. Perri +4
We studied the temporal and spectral evolution of the synchrotron emission from the high energy peaked BL Lac object 1E 1207.9+3945. Two recent observations have been performed by…
A study of the prompt and afterglow emission of the Short GRB 061201
G. Stratta, P. D'Avanzo, S. Piranomonte +30
Our knowledge of the intrinsic properties of short duration Gamma-Ray Bursts has relied, so far, only upon a few cases for which the estimate of the distance and an extended, multi…
The in-flight spectroscopic performance of the Swift XRT CCD camera during 2006-2007
O. Godet, A. P. Beardmore, A. F. Abbey +26
The Swift X-ray Telescope focal plane camera is a front-illuminated MOS CCD, providing a spectral response kernel of 135 eV FWHM at 5.9 keV as measured before launch. We describe t…
GRB 070311: a direct link between the prompt emission and the afterglow
C. Guidorzi, S. D. Vergani, S. Sazonov +30
We present prompt gamma-ray, early NIR/optical, late optical and X-ray observations of the peculiar GRB 070311 discovered by INTEGRAL, in order to gain clues on the mechanisms resp…
Swift-XRT observation of 34 new INTEGRAL/IBIS AGNs: discovery of Compton thick and other peculiar sources
A. Malizia, R. Landi, L. Bassani +7
For a significant number of the sources detected at high energies (>10 keV) by the INTEGRAL/IBIS and Swift/BAT instruments there is either a lack information about them in the 2-10…
The Sedentary Survey of Extreme High Energy Peaked BL Lacs III. Results from Optical Spectroscopy
S. Piranomonte, M. Perri, P. Giommi +2
The multi-frequency Sedentary Survey is a flux limited, statistically well-defined sample of highly X-ray dominated BL Lacertae objects (HBLs) which includes 150 sources. In this p…
Testing the gamma-ray burst variability/peak luminosity correlation on a Swift homogeneous sample
D. Rizzuto, C. Guidorzi, P. Romano +10
We test the gamma-ray burst correlation between temporal variability and peak luminosity of the -ray profile on a homogeneous sample of 36 Swift/BAT GRBs with firm redshift dete…
An online repository of Swift/XRT light curves of GRBs
P. A. Evans, A. P. Beardmore, K. L. Page +12
Context. Swift data are revolutionising our understanding of Gamma Ray Bursts. Since bursts fade rapidly, it is desirable to create and disseminate accurate light curves rapidly. A…
Swift observations of GRB 060614: an anomalous burst with a well behaved afterglow
V. Mangano, S. T. Holland, D. Malesani +22
GRB 060614 is a remarkable GRB observed by Swift with puzzling properties, which challenge current progenitor models. The lack of any bright SN down to very strict limits and the v…
Blazar surveys with WMAP and Swift
P. Giommi, M. Capalbi, E. Cavazzuti +7
We present the preliminary results from two new surveys of blazars that have direct implications on the GLAST detection of extragalactic sources from two different perspectives: mi…
The exceptionally extended flaring activity in the X-ray afterglow of GRB 050730 observed with Swift and XMM-Newton
M. Perri, D. Guetta, L. A. Antonelli +27
We present the results of a detailed spectral and temporal analysis of Swift and XMM-Newton observations of the high redshift (z=3.969) GRB 050730. The X-ray afterglow of GRB 05073…
IGR J16194-2810: a new symbiotic X-ray binary
N. Masetti, R. Landi, M. L. Pretorius +7
We here report on the multiwavelength study which led us to the identification of X-ray source IGR J16194-2810 as a new Symbiotic X-ray Binary (SyXB), that is, a rare type of Low M…
ROXA J081009.9+384757.0: a erg/s blazar with hard X-ray synchrotron peak or a new type of radio loud AGN?
P. Giommi, E. Massaro, P. Padovani +10
We report the discovery of ROXA J081009.9+384757.0 = SDSS J081009.9+384757.0, a z=3.95 blazar with a highly unusual Spectral Energy Distribution (SED). This object was first notice…
Swift detection of all previously undetected blazars in a micro-wave flux-limited sample of WMAP foreground sources
P. Giommi, M. Capalbi, E. Cavazzuti +19
Almost the totality of the bright foreground sources in the WMAP CMB maps are blazars, a class of sources that show usually also X-ray emission. However, 23 objects in a flux-limit…
The First Survey of X-ray Flares from Gamma Ray Bursts Observed by Swift: Temporal Properties and Morphology
G. Chincarini, A. Moretti, P. Romano +24
We present the first systematic investigation of the morphological and timing properties of flares in GRBs observed by Swift/XRT. We consider a large sample drawn from all GRBs det…
Rest frame light curves of Swift GRBs
V. Mangano, V. La Parola, E. Troja +12
We have computed the luminosity rest frame light curves of the first 40 Gamma-ray bursts (GRBs) detected by Swift with well established redshift. We studied average properties of t…
Pile-up correction for the Swift-XRT observations in WT mode
T. Mineo, P. Romano, V. Mangano +12
The detector at the focal plane of the Swift X-ray Telescope (XRT) supports four readout modes, automatically changed on board, to cover the dynamical range of fluxes and rapid var…
GRB 060714: No Clear Dividing Line Between Prompt Emission and X-ray Flares
H. A. Krimm, J. Granot, F. Marshal +6
The long gamma-ray burst GRB 060714 was observed to exhibit a series of five X-ray flares beginning ~70 s after the burst trigger T0 and continuing until T0 + ~200 s. The first two…
The short GRB 051210 observed by Swift
V. La Parola, V. Mangano, B. Zhang +12
We report on the short GRB051210 detected by the Swift-BAT. The light curve, on which we focus mainly, shows a hint of extended emission in the BAT energy range, a steep decay of t…
Swift GRBs: the early afterglow spectral energy distribution
G. Tagliaferri, D. Malesani, S. D. Vergani +16
We present the first results of a program to systematically study the optical-to-X-ray spectral energy distribution (SED) of Swift GRB afterglows with known redshift. The goal is t…
Attributes of flares in Gamma Ray Bursts: sample I
G. Chincarini, A. Moretti, P. Romano +14
We discuss some of the preliminary results and findings derived from the analysis of a first sample of flares detected by the XRT on board Swift. The analysis shows that the morpho…