Dear colleagues, Arne Henden and Doug West, thank you for your information about AAVSO site. I had not known the Light Curve Generator. That is useful and I added the URL to my bookmark. Jaime Garcķa, thank you for your another light curve page. Taichi Kato, thank you for your IBVS paper. Hmm, now I see that V2540 Oph is a rare nova. And I found that my first three observations on Feb. 22 and Mar. 8 and 9 were just at the peaks by chance. Then I observed it at bottom on Mar. 19, and my last observation on Apr. 5 when it is at the peak again. Now that the VSNET server is not available, and I did not about the AAVSO Ligth Curve Generator, I had no way to know others observations. So I was very very surprised at the rebrightening. Now I see that is due to the oscillation, and I could not notice it because my observations are sparse. P.S. Taichi Kato's paper is in astro-ph. Does it mean that it is not accepted by IBVS yet? Or, it is already accepted but not yet issued? Best regards, -- Seiichi Yoshida comet@aerith.net http://vsnet.aerith.net/