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56 papers · 1 filter
X-ray polarimetry on-board HXMT
Paolo Soffitta, Ronaldo Bellazzini, Gianpiero Tagliaferri +15
The development of micropixel gas detectors, capable to image tracks produced in a gas by photoelectrons, makes possible to perform polarimetry of X-ray celestial sources in the fo…
The metamorphosis of Supernova SN2008D/XRF080109: a link between Supernovae and GRBs/Hypernovae
Paolo A. Mazzali, Stefano Valenti, Massimo Della Valle +38
The only supernovae (SNe) to have shown early gamma-ray or X-ray emission thus far are overenergetic, broad-lined Type Ic SNe (Hypernovae - HNe). Recently, SN 2008D shows several n…
Focusing of gamma-rays with Laue lenses: first results
F. Frontera, G. Loffredo, A. Pisa +12
We report on the first results obtained from our development project of focusing gamma-rays (60 keV) by using Laue lenses. The first lens prototype model has been assembled and…
Lorentz Violation and Ultrahigh-Energy Photons
Matteo Galaverni, Guenter Sigl
The propagation of photons, electrons and positrons at ultra-high energies above 10^{19} eV can be changed considerably if the dispersion relations of these particles are modified…
Swift uncovers that SAX J0840.7+2248 is not an X-ray Binary, but BeppoSAX X-ray Rich GRB 980429
P. Romano, C. Guidorzi, L. Sidoli +8
During our Swift/XRT program to obtain X-ray positions at arcsecond level for a sample of Galactic X-ray binaries, we discovered that SAX J0840.7+2248 is not a binary, but rather B…
ESC Supernova spectroscopy of non-ESC targets
A. H. Harutyunyan, P. Pfahler, A. Pastorello +12
We present the spectra of 36 Supernovae (SNe) of various types, obtained by the European Supernova Collaboration. Because of the spectral classification and the phase determination…