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I got this from Enrico Cappellaro.

 SN1992A     48640.50  12.56 

According to Jeffery et al. (1992)
  Vmax=12.61\pm.05 on January 20.9\pm.5

    Therefore Julian Date=8622+.5+20.9-1.
                         =8642.4
    which looks about right.

  Bmax=12.6\pm.2 on January 19.2\pm1.0 

    Therefore Julian Date=8622+.5+19.2-1.
                         =8640.7  
    which looks about right.

  The Julian Date of explosion by the 18 day
  rule is 8622.7


#_____________________________________________________
# 1=Suntzeff, in IAU Coll. n. 145

______________________________________________________
JD           V    Source
END:
  48633.5  13.26     1
  48634.5  13.07     1
  48635.06 12.81    NTT    1 
  48635.5  12.91     1
  48636.06 12.79    NTT    2 
  48636.5  12.78     1
  48637.03 12.73    NTT    3
  48637.5  12.71     1
  48638.03 12.69    NTT    4
  48638.5  12.66     1
  48639.03 12.66    NTT    5
  48639.5  12.60     1
  48640.5  12.57     1
  48641.5  12.57     1
  48642.5  12.54     1
  48643.5  12.54     1
  48644.5  12.57     1
  48645.5  12.60     1
  48646.5  12.65     1
  48647.5  12.72     1
  48648.5  12.78     1
  48649.5  12.87     1
  48650.5  12.95     1
  48651.5  13.06     1
  48652.5  13.12     1
  48653.5  13.18     1
  48654.5  13.24     1
  48655.5  13.30     1
  48656.5  13.36     1
  48656.57 13.43    ESO 3.6      6
  48657.5  13.41     1
  48658.5  13.45     1
  48660.5  13.57     1
  48662.5  13.76     1
  48673.5  14.54     1
  48674.5  14.59     1
  48675.5  14.63     1
  48677.5  14.73     1
  48678.5  14.76     1
  48680.5  14.79     1
  48687.5  14.95     1
  48691.5  15.12     1
  48692.03 15.19    ESO 3.6      7
  48693.5  15.19     1
  48697.5  15.33     1
  48701.5  15.36     1
  48712.5  15.66     1
  48716.5  15.80     1
  48719.5  15.88     1
  48720.5  15.94     1
  48730.5  16.22     1
  48731.5  16.27     1
  48829.92 18.24    ESO 2.2         207.223 
  48867.8  18.61    ESO 3.6      
  48894.5  19.68    Dutch  (poor)   271.801
  48918.74 19.60    ESO 2.2    
  48956.70 19.98    ESO 3.6    
  48958.63 20.08    NTT        
  48979.64 20.29    ESO 3.6     
  49011.55 20.68    ESO 3.6          
  49011.55 20.76    ESO 3.6          
  49045.54 21.23    ESO 2.2     
  49046.50 21.22    ESO 2.2     
  49073.54 21.49    NTT     
  49566.50 25.9     HST WFPC2 (+/- 0.3)