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[vsnet-newvar 1842] Re: IGR J16318-4848 optical detection

Date: Mon, 24 Feb 2003 20:06:53 +0900 (JST)
To: vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp,vsnet-campaign-xray@ooruri.kusastro.kyoto-u.ac.jp
From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
Subject: [vsnet-newvar 1842] Re: IGR J16318-4848 optical detection
Cc: aavso@aavso.org, dgreen@cfa.harvard.edu,vsnet-newvar@ooruri.kusastro.kyoto-u.ac.jp
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Re: IGR J16318-4848 optical detection

> A clear optical source was detected on those images at a constant
> brightness as measured against UCAC1 magnitudes of nearby stars.
> 
> IGR J16318-4848   20030204.08   17.3CR
> IGR J16318-4848   20030208.10   17.3CR

   This object is a bright object in 2MASS.  Since the object lacks
a clear signature of brightening, the identity with the X-ray transient
is still unclear.  Being atypical for an optical countertpart of an
X-ray transient, the object may be a mere superimposed red star.
We probably need spectroscopy for clarification.  Anyway keep observing.

Regards,
Taichi Kato

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