[vsnet-alert 2550] BeppoSAX MAIL n. 99/3: GRB990123: X-ray afterglow

[Luigi Piro - BeppoSAX Mission Scientist <piro@ias.rm.cnr.it>]

BeppoSAX MAIL n. 99/3: GRB990123: X-ray afterglow

A BeppoSAX follow-up of GRB990123 initiated around 15:40 UT, i.e.
6 hr after the burst

Preliminary analysis of the first 20 minutes of the
data at SOC  shows a previously
unknown strong source (about 10**-11 c.g.s in the 1.6-10 keV )
in the center of the WFC error circle.

Preliminary coordinates  are:
R.A.(2000)= 231.374
DEC(2000)= +44.758

The error radius is  1.5'


Considering its strenght, this X-ray source is very likely the X-ray
afterglow of GB990123
We will continue to observe it to monitor its temporal evolution

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
#__________________________________#___________________________________________#

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