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Swift XRT Observations of the Afterglow of XRF 050416A
Vanessa Mangano, Valentina La Parola, Giancarlo Cusumano +20
Swift discovered XRF 050416A with the BAT and began observing it with its narrow field instruments only 64.5 s after the burst onset. Its very soft spectrum classifies this event a…
Swift XRT Observations of the Afterglow of GRB 050319
G. Cusumano, V. Mangano, L. Angelini +27
Swift discovered the high redshift GRB 050319 with the Burst Alert Telescope and began observing with its narrow field instruments only 225 s after the burst onset. The afterglow X…
Long term X-ray spectral variability of the nucleus of M81
V. La Parola, G. Fabbiano, M. Elvis +3
We have analysed the soft X-ray emission from the nuclear source of the nearby spiral galaxy M81, using the available data collected with ROSAT, ASCA, BeppoSAX and Chandra. The sou…
Spectral variability of the nucleus of M33 in a Chandra-ACIS observation
V. La Parola, F. Damiani, G. Fabbiano +1
We have analyzed a 90 ksec long observation of the bright nucleus of M33 made with Chandra/ACIS. We detected low-amplitude (~sim10%) highly significant variability on timescales of…