[vsolj-alert 424] XTE J1859+226 radio

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

XTE J1859+226 radio

　電波の観測結果が出ています。通常の（速く減光するタイプではなさそうな）
　Ｘ線トランジェントのようです。北半球で見えるのは久しぶりなので、可視光
　ではちょっと暗いですがみてみましょう。

Date: Wed, 13 Oct 1999 08:32:38 -0600
To: dasmith@space.mit.edu, michiel@astro.uva.nl, rpf@astro.uva.nl,
        rudy@space.mit.edu, gehrels@lheavx.gsfc.nasa.gov,
        giommi@napa.sdc.asi.it, jem@head-cfa.harvard.edu, lewin@space.mit.edu,
        rr@space.mit.edu, shrader@grossc.gsfc.nasa.gov,
        stroh@pcasun1.gsfc.nasa.gov, swank@pcasun1.gsfc.nasa.gov,
        bmg@space.mit.edu, tkato@kusastro.kyoto-u.ac.jp,
        HARMON@SSLMOR.msfc.nasa.gov, chaswell@star.cpes.susx.ac.uk,
        ehm@space.mit.edu, Michael.McCollough@msfc.nasa.gov,
        p.charles1@physics.oxford.ac.uk, eiken@astrosun.tn.cornell.edu,
        srk@astro.caltech.edu, tavani@astro.columbia.edu,
        ewaltman@rsd.nrl.navy.mil, fghigo@cv3.cv.nrao.edu, rmw@as.arizona.edu,
        rhjellmi@zia.aoc.NRAO.EDU, mrupen@zia.aoc.NRAO.EDU,
        amiodusz@zia.aoc.NRAO.EDU, satr@cats.sao.ru, jgreiner@aip.de,
        mnowak@rocinante.colorado.edu, wheel@alla.as.utexas.edu,
        garcia@head-cfa.harvard.edu, RWH@physics.usyd.edu.au, res@jb.man.ac.uk,
        cjd@jb.man.ac.uk, amsr@jb.man.ac.uk, stg@jb.man.ac.uk,
        mirabel@discovery.saclay.cea.fr, rhjellmi@cv3.cv.nrao.edu,
        vdhawan@cv3.cv.nrao.edu, luisfr@astrosmo.unam.mx,
        ogley@discovery.saclay.cea.fr, guy@mrao.cam.ac.uk,
        jmarti@burriac.ujaen.es, Eric.Gerard@obspm.fr, S.Chaty@open.ac.uk
From: "Robert M. (Bob) Hjellming" <rhjellmi@aoc.nrao.edu>
Subject: IAU circular submission

This is a copy of what Guy Pooley and I have just submitted to
the IAU Circulars.  Reading between the lines there is no significant
sign of change at 2 cm over a bit more than a day, so this is probably
not going to be a very fast radio transient like GM Sgr.  The next
VLA observation should be this evening, about 24 hours after the last
VLA observation reported below.  It hopefully will be on the GBI 
program starting today.

Bob

>Subject: IAU circular submission
>To: bmarsden@cfa.harvard.edu, dgreen@cfa.harvard.edu
>Date: Wed, 13 Oct 1999 14:32:01 +0100 (BST)
>From: Guy Pooley <guy@mrao.cam.ac.uk>
>Cc: rhjellmi@zia.aoc.NRAO.EDU (Robert M. Hjellming),
>        rpf@astro.uva.nl (Rob Fender), res@jb.man.ac.uk (Ralph Spencer)
>
>Dear Drs Green & Marsden,
>
>Bob Hjellming and I wish to submit the following item for inclusion
>in an IAU Circular. I hope that it is clear.
>
>Please send the invoice for the line charges for my attention at
>Mullard Radio Astronomy Observatory
>Cavendish Laboratory
>Madingley Road
>Cambridge CB3 0HE  UK.
>
>Many thanks.
>
>Guy Pooley
>
>-----------------------------------------------------------------------
>XTE J1859+226
>
>G.G. Pooley (Mullard Radio Astronomy Observatory) and R.M. Hjellming
>(National Radio Astronomy Observatory) report: "we have made Ryle
>Telescope (RT) and Very Large Array (VLA) observations of a radio
>counterpart to the X-ray transient XTE J1859+226 (IAUC 7274). On Oct.
>11.88 UT the RT detected a roughly 10 mJy radio source at 15 GHz with
>RA=18h58m42s, Decl.=+22o39'10" (equinox 2000; uncertainties 0s.5 and
>30"). A further RT observation on Oct. 12.86 detected 12.5 mJy
>(uncertainty 1.5 mJy). The VLA observations on Oct. 13.06 UT confirm
>the presence of a radio source with preliminary flux densities of 8.7,
>10.8, 11.1, 11.2, and 11.3 mJy at frequencies of 1.4, 4.9, 8.5, 14.9,
>and 22.5 GHz, with a position of RA=18h58m41s.491, Decl.=+22o39'29".8
>(equinox 2000; uncertainty 0.3").  This is consistent with the position
>of the optical counterpart reported by Garnavich et al. in IAUC 7276.
>No radio source was present at this position in the NVSS survey in Feb.
>1995 with an upper limit of about 3 mJy."
>-----------------------------------------------------------------------
>

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