N SN 1998bx was confirmed on CCD frames taken on Apr. 22, but was not present on a frame taken on 1997 Mar. 7. SN 1998by was confirmed on CCD frames taken on Apr. 22, but was not present on a frame taken on 1997 Mar. 15. SN 1998bz and SN 1998ca were found by differencing CCD frames taken on 1997 Mar. 7 and 1998 Apr. 24, and were confirmed on CCD frames taken on Apr. 29. SN 1998cb was confirmed on CCD frames taken on Apr. 29, but was not present on a frame taken on 1997 Apr. 29. We note that the error circle contains the Be star BD -02o4786.
Optical observations are strongly encouraged.
On IAUC 6900, line 1, Nizhnij Arkhyz is a site, not a person.