Dear SN watchers, Some additional informations about SN 1999em: [Spectroscopy and Astrometry] IAUC 7296 noticed that it is of type II in an early phase. SN seems to be obscured some. The position of SN is also reported: the offset from the host nucleus is 15".4 west and 17".0 south, as being remarked. [Comparison Stars] In my table on [vsnet-alert 3640], the GSC-ID of one star is incorrect. Thank you Dr. Llapasset for pointing it out. >GSC0473901361 29s.981 48'07".42 29"E202"N 13.75 should read GSC0473900125 29s.981 48'07".42 29"E202"N 13.75 Other useful informations are given by Prof. Skiff and Dr. Kato; [vsnet-alert 3641] Re: SN 1999em in NGC 1637 http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-alert/msg03641.html [vsnet-alert 3642] SN1999em, available photometry standards http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-alert/msg03642.html [Prediscovery image] Dr. Mulchin has kindly shown the image of NGC 1637 which was taken about 11 months ago at: http://vsnet.astroguy.com/ngc1637_8.html . Sincerely Yours, Hitoshi Yamaoka, Kyushu Univ., Japan yamaoka@rc.kyushu-u.ac.jp