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Dust-scattered X-ray halos around gamma-ray bursts: GRB 031203 revisited and the new case of GRB 050713A
Andrea Tiengo, Sandro Mereghetti
Scattering by interstellar dust grains can produce time variable X-ray halos around gamma-ray bursts (GRB). In particular, an X-ray expanding ring is expected when a short pulse of…
Discovery and Monitoring of the likely IR Counterpart of SGR 1806-20 during the 2004 gamma-ray burst-active state
GianLuca Israel, Stefano Covino, Roberto Mignani +9
The sky region including the Chandra position of SGR 1806-20 was monitored in the IR band during 2004, following its increased high energy bursting activity. Observations were perf…
A large spin-up rate measured with INTEGRAL in the High Mass X-ray Binary Pulsar SAXJ2103.5+4545
L. Sidoli, S. Mereghetti, S. Larsson +7
The High Mass X-ray Binary Pulsar SAXJ2103.5+4545 has been observed with INTEGRAL several times during the last outburst in 2002-2004. We report a comprehensive study of all INTEGR…
The Highest Magnetic Fields in the Universe: Anomalous X-Ray Pulsars and Soft Gamma-ray Repeaters
Sandro Mereghetti
In the last few years it has been recognized that two apparently distinct classes of peculiar high-energy sources are actually related and can be explained as young neutron stars w…
A first look with Chandra at SGR 1806-20 after the Giant Flare: significant spectral softening and rapid flux decay
N. Rea, A. Tiengo, S. Mereghetti +4
We report on the results of a ~30 ks Chandra pointing of the soft gamma-ray repeater SGR 1806-20, the first X-ray observation with high spectral resolution performed after the 2004…
A XMM-Newton View of the Soft Gamma-ray Repeater SGR 1806--20: Long Term Variability in the pre-Super Giant Flare Epoch
S. Mereghetti, A. Tiengo, P. Esposito +8
The low energy (<10 keV) X-ray emission of the Soft Gamma-ray Repeater SGR1806-20 has been studied by means of four XMM-Newton observations carried out in the last two years, the l…