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16 papers · 2 filters
GRB 100614A and GRB 100615A: two extremely dark GRBs
V. D'Elia, G. Stratta
Dark gamma-ray bursts (GRBs) are sources with a low optical-to-X-ray flux ratio. Proposed explanations for this darkness are: i) the GRB is at high redshift ii) dust in the GRB hos…
Observation of the Cosmic Ray Moon shadowing effect with ARGO-YBJ
YBJ Collaboration
Cosmic rays are hampered by the Moon and a deficit in its direction is expected (the so-called \emph{Moon shadow}). The Moon shadow is an important tool to determine the performanc…
XMM-Newton discovery of a possible cyclotron emission feature from the SFXT IGR J18483-0311
V. Sguera, L. Sidoli, A. Bazzano +2
We report the results from an archival XMM-Newton observation of the Supergiant Fast X-ray Transient (SFXT) IGR J18483-0311 during its apastron passage. The measured 0.5--10 keV lu…
Fermi-LAT Observations of Two Gamma-Ray Emission Components from the Quiescent Sun
A. A. Abdo
We report the detection of high-energy gamma rays from the quiescent Sun with the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope (Fermi) during the first 1…
Supergiant Fast X-ray Transients
Lara Sidoli
The phenomenology of a subclass of High Mass X-ray Binaries hosting a blue supergiant companion, the so-called Supergiant Fast X-ray Transients (SFXTs), is reviewed. Their number i…
The Swift Supergiant Fast X-ray Transients Project: recent results
P. Romano, S. Vercellone, V. La Parola +8
We present an overview of our Supergiant Fast X-ray Transients (SFXT) project, that started in 2007, by highlighting the unique observational contribution Swift is giving to this e…