Re: Isntix - C02-013

From: raux@in2p3.fr
Date: Tue May 07 2002 - 13:43:30 PDT

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    I checked the findind chart and it seems to be good as well as the guiding
    stars. My guesses are that:

    -It's a fake, the subtraction went wrong on this subtraction because of
    distortion in the PSF. As one can see on the tiles the shape of galaxy is
    different between the Ref and the New.
    The only thing convincing with this candidate was the shape of the light
    curve.

    - The candidate is too faint with respect to the galaxy (mag ~ 22.4) and
    the candidate (mag ~ 24).

    I would propose to wait for the next CFHT images to confirm or infirm this
    candidate (Hope having images tonight).

    Julien

    On Tue, 7 May 2002 clidman@eso.org wrote:

    > Dear Colleagues,
    > The VLT has just observed Isntix (C02-013) and they have sent me the first spectrum.
    > I cannot see the candidate in a 1200 second spectrum, but I can see a relatively
    > nearby galaxy (z=0.286) about 3.6" to the NW of the candidate.
    >
    > Both this galaxy and the target are visible in the acquisition image, but it would appear that
    > only the bright galaxy is in the slit. I've checked the FITS header and the PA was correctly set.
    >
    > It looks as if the operator has changed guide stars during the acquisition (which is a no-no). If this
    > is the case, I will ask for compensation with FORS1. But before I go down this route, I would like
    > someone to recheck that the offset and the PA from the BOX star to the candidate is correct.
    >
    > Cheers, Chris.
    >
    >
    >
    > 

    -- 
Julien Raux
Groupe Supernovae
LPNHE, Universites Paris VI & VII, 4 Place Jussieu - T33 RdC75252 Paris
cedex 05 - Tel: (33) 1 44 27 23 27
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