Photometric Measurements

The photometric measurements are performed with different IRAF tasks
in the 'snphot' package. You need to start loading this package by
typing 'snphot'. This will give you a listing of the tasks. There
are five relevant tasks which perform the following operations, 

1.  The task standards computes a photometric solution for the night 
2.  The task objects computes a photometric sequence around each supernova
3.  The task makeseq computes average magnitudes for the local standards
4.1 The task findstars searches for field stars in the galaxy template image
4.2 The task gsub performs the galaxy subtraction
5.  The task sne performs differential photometry between the supernova and
    the local standards