Re: [AAVSO-DIS] GRB notification process > Berto drew our attention to this possible GRB/SNe association. > There has been much discussion on this case in the literature > and at meetings. The background was that when the GRB went off, > SAX found two X-ray sources in the error box. One was centered > on SN 1998bw; the other was a fading X-ray source (classical > counterpart to other GRBs). This second source was ignored, > and the SNe was speculated to be the counterpart, especially > since the SNe occurred within a day or so of the GRB. Many > models were produced, showing how a hypernovae (a more massive > star than a supernovae progenitor) could produce beamed gamma > rays, and spectra also showed 1998bw to be unusual. Still, > the classical source was ignored. I don't know what is the current consensus of this event (probably none yet reached), but I have heard the existtence of the second "fading X-ray source" was not so significant as was prevously claimed to be, by later examination of the discovery data. Regards, Taichi Kato