A ROSAT Wide Field Camera search for XUV bursts

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photography, Gamma Ray Bursts, Rosat Mission, Sky Surveys (Astronomy), Extreme Ultraviolet Radiation, Proportional Counters, Spectral Line Width

Scientific paper

We have searched the ROSAT Wide Field Camera all-sky survey for short time-scale (less than 50 s) XUV bursts down to a limiting count of 5 x 10 exp -3 count/sq arcmin, corresponding to an incident flux of about 3 x 10 exp -10 erg/sq cm. In a total observation period of 171 d covering the entire sky, we found no evidence for such events. The present results are used to place limits on the log N-log S relation for gamma-ray bursts and constraints on the spectral shape of the previously reported ultrasoft X-ray transients.

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