IY UMa (=TmzV85) outburst! As reported by Timo Kinnunen in vsnet-alert 5291, the deeply eclipsing SU UMa-type dwarf nova IY UMa = TmzV85 is undergoing a bright outburst (likely superoutburst). Although the object is not very favorably located, we encourage time-resolved photometry, as we did in January. The present outburst is far brighter (mv=13.0) than the January one, so we can expect to see a different aspect of its superoutburst. More information is available at http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/tmzv85.html and http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/IY_UMa/ Observations should be sent to either Uemura-san (uemura@kusastro.kyoto-u.ac.jp) or to vsnet-campaign-data for immediate distribution. Regards, Taichi Kato VSNET Collaboration team