From: Vitaliy Fadeyev (VAFadeyev@lbl.gov)
Date: Mon Apr 05 2004 - 11:20:44 PDT
No there were not a whole lot of those, just a couple of cases
with 1 CR and 3 clean images with small signals. Then the sum was
brighter. I chalked them up to the CR neighbouring pixels summing up
with the fluctuations. Usually a look at the flux significance was
good enough.
vitaliy
"Rachel G." wrote:
> In cases where there are two CRs, and no host, one
> couldn't be confident it was a real event anyway. In cases
> where there were 3 good, consistent, and clean regions, but
> CRs in the 4th image, CRs should have been efficiently
> flagged prior to the sum.
>
> The point is that if there were a lot of cases with 3
> consistent images going into the sum, but a summed magnitude
> which was much *brighter* than those 3 individual images,
> then one should get concerned and say something.
>
> On Mon, 5 Apr 2004, Vitaliy Fadeyev wrote:
>
> >
> >
> > Sorry for confusion. I meant only cases where there is 1 or more CR clearly
> > present in individual images.
> >
> > vitaliy
> >
> >
> > "Robert A. Knop Jr." wrote:
> >
> > > On Mon, Apr 05, 2004 at 10:02:48AM -0700, Vitaliy Fadeyev wrote:
> > > >
> > > >
> > > > That's not so great. The individual magnitudes may have entered in
> > > > my decision-making in some cases. Granted those cases were doubtful
> > > > to start with.
> > >
> > > In any event, you should not have thrown out a candidate because all the
> > > individual magnitudes were consistent with each other and different from
> > > the subtraction magnitude. If you saw a case where that happens, and
> > > the individual magnitudes were *dimmer*, it indicates that something is
> > > wrong, not that it's a bad candidate. (That's how Rachel and I found
> > > the bug in the first place.)
> > >
> > > The only thing about those magnitudes that should affect whether or not
> > > a candidate is a good one is if the individual images are *consistent*
> > > with each other. Which this bug does not affect, anyway.
> > >
> > > -Rob
> > >
> > > --
> > > --Prof. Robert Knop
> > > Department of Physics & Astronomy, Vanderbilt University
> > > robert.a.knop@vanderbilt.edu
> >
-- ------------------------------------------------- Vitaliy Fadeyev SCP group at LBNL phone: 510-486-4169 web: http://www-physics.lbl.gov/~fadeyev/ -------------------------------------------------
This archive was generated by hypermail 2.1.4 : Mon Apr 05 2004 - 11:21:05 PDT