Re: Satie signal on the ref

From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Thu Apr 03 2003 - 12:45:54 PST

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    Thanks Julien. This seems quite conclusive even if we were to assume
    a host with a very red spectral energy distribution. At the 3-sigma
    level the SN is 32x brighter than the host. Since Satie is at z=1.05,
    the F814W filter is centered on the 4000A break. Thus, even for
    the most extremely red galaxy having 4000A break represented by a
    Heaviside function, the ratio of SN to host would still be about
    16x at 3-sigma.

    I don't know what statistical S/N we acheived for Satie in the NIR
    (assuming no host), but unless it was better than 16, the 3-sigma
    systematic error under the no-host assumption would be less that the
    statistical uncertainty.

    - Greg

    >Hi,
    >
    >Here is the comparison between the flux at maximum light and the
    >reference.
    >
    >What I did was computing the highest flux for the supernova (the first
    >point) and did the same at the place of the supernova on the ACS
    >reference. Then, I divided by the exposure (4700s for the first one, 2200s
    >for ACS) and finally divided by the mean quantum efficiency (7% for WFPC2
    >and 34% for ACS in F814W Filter).
    >
    >The result is :
    >
    >Max 13.26 +/- 0.29
    >ref 0.02 +/- 0.14
    >
    >I think that is pretty clear that there is no observable signal at least
    >in I band.
    >
    >Cheers,
    >
    >Julien
    >

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