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astro-ph2006
Dust scattering X-ray expanding rings around gamma-ray bursts
S. Mereghetti, A. Tiengo, G. Vianello
Scattering by dust grains in our Galaxy can produce X-ray halos, visible as expanding rings, around GRBs. This has been observed in three GRBs to date, allowing to derive accurate…
astro-ph2006★ 4 cited
Long term spectral variability in the Soft Gamma-ray Repeater SGR 1900+14
A. Tiengo, P. Esposito, S. Mereghetti +8
We present a systematic analysis of all the BeppoSAX data of SGR1900+14. The observations spanning five years show that the source was brighter than usual on two occasions: ~20 day…