X-Ray Observations of the First Counterpart to a Fast X-Ray Transient, XRF010930

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Chandra Proposal Id #03108065

Scientific paper

Thanks to BeppoSAX we are now aware of a new type of transient -- X-ray flashes (XRFs, also called Fast X-ray Transients). About one third of the events seen by the WFC are XRFs. Until today, NOT A SINGLE member of this class has been localized to arcsecond accuracy. Only gradually has the community come to appreciate that XRFs have a rate comparable to GRBs. There are two possibilities: 1. XRFs are highly redshifted GRBs (e.g. Heise, Lloyd) 2) XRFs are explosive events producing Lorentz factors intermediate between GRBs and SNe and thus peak in the X-ray. On 30.25 October 2001 (UT) the BeppoSAX Wide Field Camera (WFC) detected a XRF, hereafter XRF011030, unaccompanied by any increased rate in the Gamma Ray Burst Monitor (GRBM) on SAX, HETE-2 or Ulysses.

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