[vsolj-alert 60] XTE J0421+560

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

　昨日のＸ線トランジェント（Ｘ線新星）ですが、2 Crab から 0.5 Crab 以下に減衰
　していること、発表された位置が少し違っている（時角で約１ｍ西にあるようで
　す）。なお光学対応天体はまだ検出の報告はありません。

Date: Wed, 1 Apr 1998 19:02:41 -0500 (EST)
From: Jean Swank <swank@pcasun1.gsfc.nasa.gov>
To: xtej0421+560 -- Carole Haswell <chaswell@star.cpes.susx.ac.uk>,
        dasmith@space.mit.edu, ehm@space.mit.edu,
        Tod Strohmayer <stroh@pcasun1.gsfc.nasa.gov>,
        gehrels@lheavx.gsfc.nasa.gov, giommi@napa.sdc.asi.it,
        HARMON@SSLMOR.msfc.nasa.gov, jeanz@purple.sron.ruu.nl,
        JeffMcClintock <jem@head-cfa.harvard.edu>, rhjellmi@aoc.nrao.edu,
        rr@space.mit.edu, xteplan <xteplan@xgo2.nascom.nasa.gov>,
        shrader@grossc.gsfc.nasa.gov, vsnet-alert@kusastro.kyoto-u.ac.jp,
        "WalterH.G.Lewin" <lewin@space.mit.edu>
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Interim report to interested parties:

I know some of you are planning observations at other wavelengths or are
anxious about how the observations will be planned, what we know about the
source and who will have access to the data. I should inform you of some
developments.

1.) Source intensity
Last night the source reached the equivalent of ~ 2 Crab in the PCA, ~ 1
Crab in HEXTE. But it has declined till it is less than 0.5 Crab recently
in the ASM.  

2.) We think the position needs correcting, but do not have an accurate
one for you. The position given in the cirular (which has not come out) is
65.253, 56.058, with an error of ~4'. Last night we executed 4 raster
scans over the source. It is clear that the dec pretty good, but the ra
looks closer to 65.0 than to 65.25 degrees, so that the error is
underestimated. 

We should be able to get a position to a couple of arc minutes from the
scans. By an accident of where the satellite was and the data streams, we
seem to be missing, so far, the real time per detector rates (called
Standard 1 and 2). We are attempting to get these data as soon as
possible. A few more concidences slowed this progress, such as fall
out from a need to change passwords and tighten computer security.

The disposition of the observations I will comment more on shortly.

Ron has been in transit between GSFC and MIT. 

Jean

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