Serpens X-1 observed by INTEGRAL
N. Masetti, L. Foschini, E. Palazzi, V. Beckmann, N. Lund, S. Brandt, N. J. Westergaard, L. Amati, E. Caroli, S. Del Sordo, G. Di Cocco, P. Durouchoux, R. Farinelli, F. Frontera, M. Orlandini, A. Zdziarski
Abstract
Here we report results of an INTEGRAL-AO1 observation of the X-ray burst and atoll source Ser X-1 performed in May 2003. The object was observed for a total on-source time of 400 ks but nearly 8 degrees off-axis due to its amalgamation with an observation of SS 433, the pointing target source. Ser X-1 has been clearly detected up to 30 keV with unprecedented positional accuracy for high-energy emission. The 20-30 keV light curve showed substantial variability during the observation. Comparison with previous observations indicates that the source was in its high (`banana') state and displayed a soft spectrum during the INTEGRAL pointing. A (non simultaneous) radio-to-gamma-rays broad-band spectral energy distribution is also presented for the first time and discussed.
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