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The Pan-STARRS1 (PS1) survey has obtained imaging in 5 bands (grizy_P1) over10 Medium Deep Survey (MDS) fields covering a total of 70 square degrees. Thispaper describes the search for apparently hostless supernovae (SNe) within thefirst year of PS1 MDS data with an aim of discovering new superluminoussupernovae (SLSNe). A total of 249 hostless transients were discovered down toa limiting magnitude of M_AB ~ 23.5, of which 76 were classified as Type IaSNe. There were 57 SNe with complete light curves that are likely core-collapseSNe (CCSNe) or SLSNe and 12 of these have had spectra taken. Of these 12hostless, non-Type Ia SNe, 7 were SLSNe of Type Ic at redshifts between0.5-1.4. This illustrates that the discovery rate of Type Ic SLSNe can bemaximised by concentrating on hostless transients and removing normal SNe Ia.We present data for two new possible SLSNe; PS1-10pm (z = 1.206) and PS1-10ahf(z = 1.1), and estimate the rate of SLSNe-Ic to be between 3^{+3}_{-2} *10^{-5} and 8^{+2}_{-1} * 10^{-5} of the CCSNe rate within 0.3 <= z <= 1.4 byapplying a Monte-Carlo technique. The rate of slowly evolving, SN2007bi-likeexplosions is estimated as a factor of 10 lower than this range.

Selecting superluminous supernovae in faint galaxies from the first year of the Pan-STARRS1 Medium Deep Survey