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19 papers · 2 filters
The dust-scattering X-ray rings of the anomalous X-ray pulsar 1E 1547.0-5408
A. Tiengo, G. Vianello, P. Esposito +14
On 2009 January 22 numerous strong bursts were detected from the anomalous X-ray pulsar 1E 1547.0-5408. Swift/XRT and XMM-Newton/EPIC observations carried out in the following two…
Temporal properties of GX 301-2 over a year-long observation with SuperAGILE
Y. Evangelista, M. Feroci, E. Costa +52
We present the long-term monitoring of the High Mass X-ray Binary GX 301-2 performed with the SuperAGILE instrument on-board the AGILE mission. The source was monitored in the 20-6…
XMM-Newton and Swift observations prove GRB 090709A to be a distant, standard, long GRB
A. De Luca, P. Esposito, G. L. Israel +4
GRB 090709A is a long gamma-ray burst (GRB) discovered by Swift, featuring a bright X-ray afterglow as well as a faint infrared transient with very red and peculiar colors. The bur…
Discovery of extreme particle acceleration in the microquasar Cygnus X-3
M. Tavani, A. Bulgarelli, G. Piano +67
The study of relativistic particle acceleration is a major topic of high-energy astrophysics. It is well known that massive black holes in active galaxies can release a substantial…
The discovery of a massive white dwarf in the peculiar binary system HD 49798/RX J0648.0-4418
S. Mereghetti, A. Tiengo, P. Esposito +3
An XMM-Mewton observation performed in May 2008 has confirmed that the 13 seconds pulsations in the X-ray binary HD 49798/RX J0648.0-4418 are due to a rapidly rotating white dwarf.…
Multiwavelength observations of a TeV-Flare from W Comae
VERITAS collaboration, V. A. Acciari, E. Aliu +167
We report results from an intensive multiwavelength campaign on the intermediate-frequency-peaked BL Lacertae object W Com (z=0.102) during a strong outburst of very high energy ga…
Agile Detection of Delayed Gamma-Ray Emission from the Short Gamma-Ray Burst GRB 090510
A. Giuliani, F. Fuschino, G. Vianello +59
Short gamma-ray bursts (GRBs), typically lasting less than 2 s, are a special class of GRBs of great interest. We report the detection by the AGILE satellite of the short GRB 09051…
AGILE detection of a rapid gamma-ray flare from the blazar PKS 1510-089 during the GASP-WEBT monitoring
F. D'Ammando, G. Pucella, C. M. Raiteri +103
We report the detection by the AGILE satellite of a rapid gamma-ray flare from the powerful gamma-ray quasar PKS 1510-089, during a pointing centered on the Galactic Center region…
Quiet but still bright: XMM-Newton observations of the soft gamma-ray repeater SGR 0526-66
A. Tiengo, P. Esposito, S. Mereghetti +6
SGR 0526-66 was the first soft gamma-ray repeater (SGR) from which a giant flare was detected in March 1979, suggesting the existence of magnetars, i.e. neutron stars powered by th…
XMM-Newton observation of the persistent Be/NS X-ray binary pulsar RX J1037.5-5647 in a low luminosity state
N. La Palombara, L. Sidoli, P. Esposito +2
The spectra of several X-ray binary pulsars display a clear soft excess, which in most cases can be described with a blackbody model, above the main power-law component. While in t…
Spin-down rate and inferred dipole magnetic field of the soft gamma-ray repeater SGR 1627-41
P. Esposito, M. Burgay, A. Possenti +11
Using Chandra data taken on 2008 June, we detected pulsations at 2.59439(4) s in the soft gamma-ray repeater SGR 1627-41. This is the second measurement of the source spin period a…
Search for Gamma Ray Bursts with the Argo-YBJ Detector in Scaler Mode
YBJ Collaboration, G. Aielli
We report on the search for Gamma Ray Bursts (GRBs) in the energy range 1-100 GeV in coincidence with the prompt emission detected by satellites using the Astrophysical Radiation w…
Detection of Gamma-ray Emission from the Eta-Carinae Region
M. Tavani, S. Sabatini, E. Pian +63
We present the results of extensive observations by the gamma-ray AGILE satellite of the Galactic region hosting the Carina nebula and the remarkable colliding wind binary Eta Cari…
The first outburst of the new magnetar candidate SGR 0501+4516
Nanda Rea, GianLuca Israel, Roberto Turolla +17
We report here on the outburst onset and evolution of the new Soft Gamma Repeater SGR 0501+4516. We monitored the new SGR with XMM-Newton starting on 2008 August 23, one day after…
Discovery of new gamma-ray pulsars with AGILE
A. Pellizzoni, M. Pilia, A. Possenti +67
Using gamma-ray data collected by the Astrorivelatore Gamma ad Immagini LEggero (AGILE) satellite over a period of almost one year (from 2007 July to 2008 June), we searched for pu…
Strong bursts from the anomalous X-ray pulsar 1E 1547.0-5408 observed with the INTEGRAL/SPI Anti-Coincidence Shield
S. Mereghetti, D. Gotz, G. Weidenspointner +9
In January 2009, multiple short bursts of soft gamma-rays were detected from the direction of the anomalous X-ray pulsar 1E 1547.0-5408 by different satellites. Here we report on t…
ARGO-YBJ constraints on very high energy emission from GRBs
YBJ Collaboration, G. Aielli
The ARGO-YBJ (Astrophysical Radiation Ground-based Observatory at YangBaJing) experiment is designed for very high energy -astronomy and cosmic ray researches. Due to the full c…
First AGILE Catalog of High Confidence Gamma-Ray Sources
C. Pittori, F. Verrecchia, A. W. Chen +80
We present the first catalog of high-confidence gamma-ray sources detected by the AGILE satellite during observations performed from July 9, 2007 to June 30, 2008. Catalogued sourc…
Suzaku Observation of the New Soft Gamma Repeater SGR 0501+4516 in Outburst
T. Enoto, Y. E. Nakagawa, N. Rea +17
We present the first Suzaku observation of the new Soft Gamma Repeater SGR 0501+4516, performed on 2008 August 26, four days after the onset of bursting activity of this new member…