[vsolj-alert 241] GRB990123 X-ray afterglow

[Atsumasa Yoshida <ayoshida@crown.riken.go.jp>]

新しい情報です。
可視光transientとconsistentな位置に、大変明るいX線afterglowが見つかり
ました。
下記の情報が正しければ、今までで一番明るいX線afterglowだと思われます。

理研　吉田

From: Luigi Piro - BeppoSAX Mission Scientist <piro@ias.rm.cnr.it>
To: BEPPOSAX GRB ALERT LIST_2:;;   ;;
Subject: BeppoSAX MAIL n. 99/3: GRB990123: X-ray afterglow
Date: Fri, 23 Jan 1998 20:13:14 +0000 (GMT)


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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