BeppoSAX MAIL n. 99/9: New fast X-ray transient Note: we have decided to distribute this info to the BeppoSAX GRB alert list due to the potential association of these events (or some of those) with GRB. On May 20 at 2:02:58 UT a fast X-ray transient, which we designate 1SAX J0835.9+5118, was detected by one of the BeppoSAX WFC (n.1). The event lasted about 10 s., with a peak flux of about 1 Crab in the 2-25 keV range. The position is (equinox 2000) R.A.=128.98, decl=51.31, with an error radius of 3'. No previously known X-ray source lies in the error box. At a preliminary analysis no simultaneous signal was detected by the GRBM (40-700 keV). Follow up observations are encouraged to investigate the nature of this object. Luigi Piro BeppoSAX Mission Scientist #----------------------------------#------------------------------------------# Luigi Piro | E-mail: Istituto Astrofisica Spaziale | piro@alpha1.ias.rm.cnr.it C.N.R. | SAX program: saxsci@alpha1.ias.rm.cnr.it Via Fosso del Cavaliere | phone: -39-06-4993-4007 I-00133 Roma | phone BeppoSAX center: -39-06-4079-6393 Italy | fax(CNR) : -39-06-20660188 #__________________________________#___________________________________________#