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We analyze two years (mid-2010 to mid-2012) of OGLE-IV data covering ~65deg^2 of the Magellanic Bridge (the area between the Magellanic Clouds) andfind 130 transient events including 126 supernovae (SNe), two foreground dwarfnovae and another two SNe-like transients that turned out to be active galacticnuclei (AGNs). We show our SNe detection efficiency as a function of SN peakmagnitude based on available SNe rate estimates. It is 100% for SNe peakmagnitudes I<18.8 mag and drops to 50% at I=~19.7 mag. With our currentobserving area between and around the Magellanic Clouds (~600 deg^2), we expectto find 24 SNe peaking above I<18 mag, 100 above I<19 mag, and 340 above I<20mag, annually. We briefly introduce our on-line near-real-time detection systemfor SNe and other transients, the OGLE Transient Detection System.

Supernovae and Other Transients in the OGLE-IV Magellanic Bridge Data