Re: Correction to the time available at cfht

From: Saul Perlmutter (saul@lbl.gov)
Date: Mon May 06 2002 - 15:50:52 PDT

  • Next message: Robert A. Knop Jr.: "Re: Correction to the time available at cfht"

    (Sorry to continue the email barrage.)

    That is a planned *total* of 25 minutes in each field altogether over the four
    non-queue CFHT nights -- *not* 25 min per night. (I misunderstood Julien in
    stating that tonight was a queue night -- it's not. It is the first of these
    four non-queue nights.)

    And then the following nights, beginning with May 10, the CFHT queue starts
    again, so we have the possibility of getting an additional 30 min for each
    field in I and 10 min for each field in R just before the Keck run begins.

    The original concept was that we would add together several nights of the
    rolling observations to go deep enough to look for SNe at z >1. Now,
    however, it does seem that even with good weather tonight and on May 10, we
    will still not be deep enough with this CFHT data (although it would bode
    well for the Subaru observations on the same mountain collecting deep search
    data). So, if Rob thinks that we can do a deep search with cross-telescope
    subtractions -- and that this is a better choice than a year-old-ref
    CTIO-field search or a search of the Subaru fields from last month -- then
    this would lean us back towards taking CFHT fields tonight.

    raux@in2p3.fr wrote:

    >
    > I already correct this. I really meant 25 minutes for each field during
    > the period begining tonight to 9th (Cuby's allocated time). If the weather
    > is not good enough, we won't have any time.
    >
    > The last chance to get images would be then, on may 10th. That would be
    > 30min in I and 10min in R for each field.
    >
    > So, if we are luck, we will have 25min+40min in each field (D1 and D4)
    > by the 11th.
    >
    > If not, bad weather on the 10th and a night lost during Cuby's time, we
    > will have no time....
    >
    > Julien
    >
    > >
    > > I think it is critical for Julien to clarify this question of how much
    > > observing time is available for the 14h+05d field at CFHT in the next 4
    > > nights.
    > >
    > > The official forecast for Mauna Kea tonight is for patchy fog at the
    > > summit and variable high cirrus, sometimes thick. This doesn't sound
    > > very "clear."
    > >
    > > - Greg
    > >
    >
    > --
    > Julien Raux
    > Groupe Supernovae
    > LPNHE, Universites Paris VI & VII, 4 Place Jussieu - T33 RdC75252 Paris
    > cedex 05 - Tel: (33) 1 44 27 23 27
    > !!!!!!!!!!!!!!! NOTE NEW E-MAIL raux@in2p3.fr !!!!!!!!!!!!!!!!!!!!!!!!!

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