Supernova confirmation procedure


See the requirements for a Supernova discovery report here: http://www.cfa.harvard.edu/iau/DiscoveryInfo.html
Procedure and information for CCD imaging: Supernovae Calibration check this : http://astrosurf.com/snweb2/report.htm
Bren is also done this: http://bmsupernova.wikispaces.com/REQUIREMENTS+FOR+SUPERNOVA+DISCOVERIES

At time T+0h, one must confirm that the candidate is not a known star neither an asteroid:
· Step1: Digital Sky Survey : http://skyview.gsfc.nasa.gov
· Step2 : Interactive NGC catalouge http://seds.org/~spider/ngc/ngc.html
· Step3 : Digital Sky Survey (NGC database) http://www.ngcic.org/dss/dss_ngc.asp (off line at the moment)
· Step4 : Sky map http://www.wikisky.org/ or http://server6.sky-map.org/
· Step5 : List of Recent Supernova : http://cfa-www.harvard.edu/iau/lists/RecentSupernovae.html
· Step6 : Check the list of Recent Supernova or Possible supernova (PSN): http://www.rochesterastronomy.org/snimages/
· Step7a : Check your (super)nova suspects for known minor planets : http://scully.harvard.edu/~cgi/CheckSN
· Step7b: Check for Satelites and Geostationary Satelites: http://www.calsky.com/cs.cgi/Satellites/
· Step 7c: Check for variable stars https://www.aavso.org/vsx/index.php?view=search.top&ql=1 (select more near the bottom to put in coordinates)
· Step8 : Look at the latest archive image (our own database) to see if the candidate is there or not
· Step9 : If all else fails, use Google (images) to check for reference galaxy images
· Step10 : Measure the offset (arcsec) of the candidates from the Galaxy core
· Step11 : Measure the magnitude

At T+24h, the goal is to confirm the candidate is really as star, not a ghost (cosmic ray, etc.):
· Step 12 : Try to make another image of the field of the candidate.

If the first steps are good, report the discovery :
· Step 13 : Follow the requirements of how to Report Discovery of a Supernova : http://www.cfa.harvard.edu/iau/HowToReportDiscovery.html
· Step 14 : Ensure that the discovery image and reference image are callibrated for position, magnitude and have the appropriate information displayed.
· Step 15 : Mail to cbat@cfa.harvard.edu and copies to dgreen@cfa.harvard.edu & green@cfa.harvard.edu . Follow the appropriate email format below:-


Discovery and reference image preparation


Images that are to be uploaded to the wiki, for linking into the discovery email, need to be calibrated for astrometric position, magnitude and display information.

The following pages outline the procedures to prepare the images.

How to plate solve an image
How to determine the position and offset of the host Galaxy and Supernova
How to determine magnitude of an object
How to add data and lines to images for reporting



Example Wikipages and emails to submit


REFER TO Possible New Supernova (PSN) FOR EXAMPLE WIKI PAGES TO SUBMIT


See:- http://datscope.wikispaces.com/Possible+SN+in+NGC+587


Note that the date and time of an observation must be shown as a decimal fraction of a day. The calculation is:-
((HOUR*60*60)+(MINUTES*60)+(SECONDS))/86400

For information to be annotated onto images see:- How to add data and lines to images for reporting

Example email 1
The Liverpool Astronomical Society Supernova Search (LASSS), report the discovery of an apparent Supernova (mag 19.5 +/- 0.5) with a 0.5M reflector (1160mm effective focal length, F2.32) and unfiltered CCD camera on 2009 May 29.976 (limiting mag 21.0) The new object is located at R.A. +53h16m20s, Decl. +2o56'07" (equinox 2000.0), which is approximately 9".9 west and 99".9 north of the centre of NGC6146. Nothing is present at this position on previous images from 2008 Aug. 4 and 2007 Oct. 6 (limiting mag 19.5) or on Digitized Sky Survey plates. No minor planets have been identified at this position for the date and time stated. Images of the apparent Supernova, and previous reference images, can bee seen in the following URL:- http://datscope.wikispaces.com CCD uses a Sony ICX249AL EXview CCD, Spectral response: QE is of the order of 30% at 400nM, 70% from 470nM to 650nM. Images are 20 seconds, Bin 1. Image scale is 1.53 arc/sec pixel. Observatory location: Latitude +53o 16' 20", Longitude +2 56' 07" West

Example email 2
David Thomson, Geoff Regan and Brendan Martin of the Liverpool Astronomical Society Supernova search (UK) report their independent discovery of 2009fl (Mag 19.5 +/- 0.5) with a 0.5M reflector + CCD camera (clear filter) on 2009 May 29.976. The object was found at R.A. +53h16m20s, Decl. +2o56'07" Images of the apparent Supernova, and previous reference images, can bee seen in the following URL: http://datscope.wikispaces.com/SN2009fl+in+NGC6146

Credit for the procedure goes to: http://alain.klotz.free.fr/snalert Other examples:- http://www.davelane.ca/aro/sn/sn2010lt.html