Re: Plan for tonight, as of now

From: clidman@eso.org
Date: Sun May 05 2002 - 08:00:49 PDT

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    Dear Saul,
       I will send Paranal the following instructions.

    SNe Priority Grism/Order Sorting Filter PA Exposure Time Estimated S/N
    ====================================================================================
    Isntix 1 300I/OG590 120.06 3600s 2
    Alambix 2 300I/OG590 -78.29 6000s 1.5
    VotreCirax 3 300V/GG435 145.65 900s 5
    =====================================================================================

      The S/N has been estimated for 0.8 seeing and is per pixel in the wavelength domain. If there is significant
    host,as there is in Isntix, the S/N will be higher.

       Currently, Paranal is reporting a seeing of 0.8" with thin cirrus. The visitor half night ends in about 2 hours
    and we'll have about 2.5 hours of observing time after that.

    Cheers, Chris.

    Saul Perlmutter wrote:

    > Hi Chris,
    > OK, here is what Julien and I have come up with. (I'm being a
    > little vague on the exact amount of exposure time for each, because you
    > probably know better what is appropriate for these magnitudes when you
    > know the seeing conditions and the time budget for tonight.)
    >
    > 1. Highest priority tonight: C02-013/Isntx
    > This should less than 1 hour total exposure time (it could
    > probably even be 45 minutes).
    > It is around I = 23.9 mag now, we think, on a 22.4 mag host.
    > Julien is trying to help check the correct slit position angle
    > to go through the host galaxy center and SN candidate.
    >
    > 2. Second priority tonight: C02-015/Alambix
    > This should be at least 1 hour total exposure time.
    > It is around I = 24.5 mag now, we think, and without any host
    > right underneath.
    > Slit position angle could go through either neighboring big
    > galaxy (see "Zoom")
    >
    > 3. Lowest priority tonight: C02-016/VotezChirax
    > This could probably be done in 15 minutes (or less!).
    > It is around I = 22.5 now, on a 24.3 mag host.
    > (Julien is checking to see if we got any useful data on it in
    > the bad-seeing data from last night.)
    > As mentioned in previous email, this would be much lower priority for
    > this current 3-night run since we can get it later after the HST
    > deadline and it's much too bright for an HST candidate.
    >
    > Julien is now doing final checks on the finding charts for these
    > candidates, but they should all be there on the web now. We'll let you
    > know of any final further news on these, but otherwise this should be
    > the plan for tonight.
    >
    > Regards, --Saul

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