Reporting a New Supernova
Since one goal of the Nearby Campaign is to find supernova as early
as possible prior to maximum, it is essential that good candidates be
reported and added to the list of follow-up objects as soon as they
are found. The cut-off for acceptance of candidates is a signal-to-noise
of 5, otherwise there will be too many spurious candidates given the
large number of pixels being searched.
There are three basic steps that should be taken once a candidate is
- Use the Add A Candidate feature of WhatsUp to
add the candidate to the follow-up database. The minimal required
It you cannot get Add A Candidate to work, please e-mail the above
information, as described in item 3 below. Other than the discovery magnitude,
the settings in the Add A Candidate Initial Values form should be
left at their default values for now.
- SN celestial coordinates, (equinox B1950)
- Offset wrt host galaxy, in (equinox B1950) arcseconds
- Offset-star (V < 17) celestial coordinates, in (equinox B1950) arcseconds
- Estimated discovery magnitude and filter (use Initial Values form)
- Discovery signal-to-noise ratio
- Date of discovery image (to nearest 0.1 day)
- Date of reference image (to nearest day)
- Whether point source is present at SN location in reference or DSS image
- Host type
- Group whose data lead to discovery
- Name of discovery group
Submit a finder chart showing the supernova, the host galaxy, and
at least one offset star (the offset star whose coordinates were submitted
to WhatsUp). The suggested field size is 3x3 arcminutes. The
most desirable graphics format is Postscript, although other formats with
commonly available web-compatiable readers can be used as well.
Finder charts can be submitted in the following ways:
- Non-SCP searchers should e-mail a postscript finder chart to
firstname.lastname@example.org, email@example.com, and firstname.lastname@example.org. One
of these people will then install the finder chart and send return
notification to the sender and to each other.
- SCP searchers outside LBL should ftp a postscript finder chart to
/home/panisse/www/htdocs/nearsearch/fcharts at LBL using the
deep account, and then add a link to
the sample link as a guide.
- SCP searchers inside LBL should place a postscript finder chart
in /home/panisse/www/production/htdocs/nearsearch/fcharts and update
index.html in the same directory, using the sample link as a guide.
Send e-mail reiterating the data from item 1, above, and
describing what finder chart information has been provided, to
email@example.com, firstname.lastname@example.org, and email@example.com. Someday
we might get WhatsUp to do this! In the meantime this e-mail will
help in verifying the data that goes into the follow-up database.
This document does not discuss filing a report of a SN discovery to the
IAU Circulars, as ususally this is not done until the candidate is
confirmed. Once confirmed, the groups involved in data taking,
searching, and confirmation should send a joint report to the IAU
Greg Aldering (firstname.lastname@example.org)