Photometry
   18.00    ....  12.70  ....  ....   ....      Leibundgut et al. 1991 fitted
   19.00    ....  .....  12.61 ....   ....      Leibundgut et al. 1991 fitted
  245.65    0.00   0.00  18.2    0.00   0.00      IAUC 5203
  272.64    0.00   0.00  18.5    0.00   0.00      IAUC 5203
END:

Leibungut et al. 1991, ApJ, 371, L23

Circular No. 5203
1991 March 8

SUPERNOVA 1990N IN NGC 4639
     C. Buil and E. Thouvenot report that an observation made Feb.
23.15 UT at Pic du Midi Observatory showed SN 1990N at V = 18.2.

This was day 54.15 of the year + (365-173.5)=191.5 gives day 245.65.




Circular No. 5207
1991 March 13

SUPERNOVA 1990N IN NGC 4639
     C. Pollas, Observatoire de la Cote d'Azur, reports detection of
this object at V about 18.5 on a Tech Pan exposure taken Mar. 13.14
UT.

This was day 72.14 of the year + (365-173.5)=191.5 gives day 263.64.