A&A 422, 381-389 (2004)
On the origin of X-ray flashesS. Dado1, A. Dar1, 2 and A. De Rújula2
1 Physics Department and Space Research Institute, Technion, Haifa 32000, Israel
2 Theory Division, CERN, 1211 Geneva 23, Switzerland
(Received 7 October 2003 / Accepted 12 February 2004 )
We use the cannonball (CB) model of gamma ray bursts (GRBs) and their afterglows (AGs) to analyze the observational data on X-ray flashes (XRFs) and their AGs. We show that the observations support the CB-model interpretation that XRFs, like GRBs, are produced by the explosions of core-collapse supernovae (SNe) akin to SN1998bw, by jets of highly-relativistic CBs. The XRFs and GRBs are intrinsically identical objects, but the XRFs are viewed from angles (relative to the jet direction) which are typically a few times larger than the typical viewing angles of "classical", long-duration GRBs. There should be XRFs, not observed so far, with durations similar to those of short GRBs.
Key words: X-rays: bursts -- -rays: bursts -- stars: supernovae: general
© ESO 2004