SN 2005ay  11 52 48.1 +44 06 18

Ref. star
US_150   11 52 40.6   +44 05 49
B 16.2   R 15.0    V 15.43

Magnitudes
03/30/2005 3:12 UTC	         V 15.66  R 15.35  (no flats)
04/05/2005 2:15 UTC     B 15.90  V 15.65  R 15.38 
04/07/2005 1:50 UTC              V 15.58  R 15.26  (poor transparency)
04/09/2005 1:30 UTC     B 16.00  V 15.64  R 15.33 
04/12/2005 1:50 UTC     B 16.00  V 15.68  R 15.33 
04/14/2005 1:30 UTC     B 16.03  V 15.60  R 15.33 
04/19/2005 1:30 UTC              V 15.72  R 15.35  
04/26/2005 2:45 UTC     B 16.55  V 15.67  R 15.36  (bright moon) 
04/28/2005 1:45 UTC     B 16.55  V 15.71  R 15.35 
05/05/2005 2:50 UTC     B 16.74  V 15.73  R 15.32			
05/10/2005 2:45 UTC     B 16.75  V 15.75  R 15.30			
05/13/2005 2:30 UTC     B 16.55  V 15.73  R 15.29			
05/17/2005 2:30 UTC     B 16.78  V 15.74  R 15.29			
06/01/2005 2:45 UTC     B 17.09  V 15.86  R 15.33			
06/15/2005 2:00 UTC              V 15.93  R 15.42			
06/16/2005 2:15 UTC              V 15.87  R 15.36