[vsnet-alert 1926] New X-ray transient (Levine)

[Taichi Kato <tkato>]

Date: Sun, 28 Jun 1998 13:52:54 -0400 (EDT)
From: "Alan M. Levine" <aml@scox1.mit.edu>
Message-ID: <vsnet-alert1926@hoge.baba.hajime.jp>
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Subject: [vsnet-alert 0] New transient X-ray source
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Dear observers & colleagues:

Here is advance notice of a new transient that we have found with
RXTE.  It may be a good opportunity for followup observations.  Good
luck!

I intend to submit copy to the IAU circulars later today or early
tomorrow AM at the latest.

-- Al Levine

Draft IAU Circular submission:

XTE J2123-058

A. Levine (MIT), J. Swank and E. Smith (GSFC) report on behalf of
the RXTE ASM and PCA teams at MIT and NASA GSFC:

A transient X-ray source has been detected with the RXTE/ASM at a
position: R.A. = 320.78 d, Dec. = -5.82 d (J2000) corresponding to l =
46.4 d, b = -36.2 d.  The position uncertainty is about 10 arcmin
along an axis with position angle 20 deg. (i.e., NE-SW) and about 5
arcmin in the perpendicular direction (90% confidence) The flux was
measured to be ~100 mCrab (2 - 12 keV) in each of 5 measurements on
1998 June 27 - 28.

The strength of the source has been confirmed with PCA observations
June 27.95 in which the count rate varied from 600 to 1000 cts/s.
Additional PCA observations, including a determination of the source
location, will be undertaken.

The appearance of a new transient X-ray source at high galactic
latitude is unusual; we urge observers to carry out additional
observations at all wavelengths.

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