From: Robert A. Knop Jr. (robert.a.knop@vanderbilt.edu)
Date: Tue Sep 10 2002 - 05:44:02 PDT
On Tue, Sep 10, 2002 at 09:28:28PM +0900, Naoki Yasuda wrote:
> (1)
> All objects are bright enough compared to the detection limit(about 26.0mag).
> For S02-016, it is not moving objects, but there is possibility of AGN.
> Dates of photometric observation are the ones in submitted material.
> Dates of spectroscopic are given in the following.
I think what he means for the "detection limit" question is: what was
the limiting magnitude in the reference image, to indicate our
confidence that the SN wasn't there yet. [1] (I got the same request on
my circular.) On mine, where I asserted there was a lightcurve, he also
wanted the date and magnitde of a later epoch, not just the discovery
date.
[1] Note that somtimes it might be detected faintly in reference images.
However, if we don't have "final references" for the field (which for
many of the CTIO ones, we do not), we have no way of knowing that. From
Dan's phrasing of the question, it's clear that he's still thinking
about "nearby" supernova discoveries, where the host is so well resolved
that the contribution of the host to the small aperture underneath the
SN is very small. For more distant supernovae, the host galaxy in the
SN's aperture is usually appreciable.
For our SNe where we don't have a "final referenced", I intend to just
quote a limiting magnitude and call that good enough, since it really is
the best of our knowledge at the moment, and since in a year nobody's
going to really care about the content of this IAUC beyond the position
and name of the SN.
-Rob
-- --Prof. Robert Knop Department of Physics & Astronomy, Vanderbilt University robert.a.knop@vanderbilt.edu
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