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Status of spectroscopy reduction from low-z working group @feb 2001
The low-z working group started working at the data in June 2000.
Here is a
report of the working progress until November 2000.
The aim of this document is to summarize the situation of the spectroscopic data, the status
of the reduction, and give comments and information about the ongoings.
All the information and the links you find in this page are also somewhere in the Collaboration
Section of the snova web page:
www.physto.se/~snova
Remember the low-z set of data?!
SET of DATA
| WHO |
WHAT |
HOW MANY NIGHTS |
SNe |
| Stockholm |
| NOT |
| INT |
| KPNO4.0 |
| Lick3.0 |
| ESO3.6 |
|
|
| sn99bk,sn99bp,sn99bm,sn99bq,sn99aa,sn99ak,sn99au,sn99as,sn99aw,sn99ac,sn99z,sn99ab,sn99ae,sn99ai |
| sn99aa,sn99bh |
| sn99bk,sn99bp,sn99bn,sn99au,sn99as,sn99aw,sn99ac,sn99bh,sn99ax,sn99ay |
| sn99bp,sn99be,sn99aa,sn99as,sn99aw,sn99ac,sn99bh,sn99ai,sn99ah,sn99ax |
| sn99bq, sn99ac, sn99ao, sn99bi, sn99av, sn99bm |
|
| Berkeley |
| APO3.5 |
| CTIO4.0 |
| Ref@Lick3.0 |
| Ref@CTIO4.0 |
| Ref@KPNO4 |
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Here is a table containing useful information about the reduced SNe (type, date of max,
how many spectra we have for each supernova, S/N ratio).
Note that the signal to noise ratio needs to be updated, because the background
was not considered at the time the table was builded up. We hope we will be able to give the corrected values very soon. A more useful database is
currently under development(Nicolas will speak about )
Our reduction scheme can be seen in our
web page.
It has been updated several times since last
June, thanks also to the careful reading of Alex Conley. The most important update is about the
background subtraction, and the way we consider it in the final error.
A report about the way we compute statistical and systematic errors is
available also in our
web page. (In the same
page you can find other documents we wrote)
The IDL programs that have been written to compute the errors will be soon available on our web page.
Contact Serena if you want to know more.
The status of reduction in Stockholm is the following:
- We reduced all the spectroscopic nights at NOT, KPNO4.0, Lick3.0
- We extracted the INT spectra, but we couldn't calibrate them in wavelength. It's not a big deal since there are only
3 spectra of 2 SNe, but it would be nice to have them done also.
- Ongoing reduction of ESO3.6 spectroscopic data: done 2 out of 6 nights
- Ongoing correction of the computed sigma for the whole set of data, to
take into account the subtracted background.
- Some of the Lick data (red channel) have fringing. We are trying to
figure out how important it is to correct it, and how to do it.
- We have never edited cosmic rays. They usually give us no problems,
and the combination of more
spectra can generally get rid of them when they are on the spectrum.
In the cases this doesn't happen we are going back to the 2D image and delete them.
The status of reduction in Berkeley is the following:
- Almost completely reduced the 4 nights at CTIO4.0. Susana is taking care of them.
- References to be reduced completely. Alex is in charge of them.
- APO3.5: nothing has been done on this set of data until now.
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