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Up: BeppoSAX detection and follow-up


1 Introduction


The GRB of 1998 April 25, detected both by the BeppoSAX GRBM and BATSE and localized with arcminute accuracy by the BeppoSAX WFC, stands out for its spatial and temporal coincidence with the optically and radio exceedingly bright Type Ic supernova SN 1998bw (Galama et al. 1998; Kulkarni et al. 1998), in the nearby galaxy ESO $\rm 184{-}G82$ (z = 0.0085). Since the other GRBs for which a redshift measurement is available are located at larger distances ($z \lower.5ex\hbox{$\; \buildrel \gt \over \sim \;$}1$) and are characterized by power-law decaying optical afterglows, in agreement with the "classical" fireball model (Rees & Mészáros 1992), this has raised a debate about a possible association between GRBs and supernovae. Following the detection of GRB 980425, observations of its error box with the BeppoSAX NFI have been activated 10 hours, one week, and six months later. We present here some results and discuss their implications in view of the detection of SN 1998bw in the GRB field. A detailed presentation will be given in Pian et al. (1999).



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Up: BeppoSAX detection and follow-up

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