A variable source in the field of MS1621.  
Confirmed by both ISIS and CPM, and with both new
sets (July 18,19) compared to both old templates
(2002 April and June). Comparing the two templates 
shows no sign for past variability of this source. 
The PSF of the source in 2002 indicates it is a 
(rather compact but still resolved) galaxy, and 
therefore this is a good SN candidate.