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We present Bolocam observations of two galaxy cluster candidates reported asunconfirmed in the Planck early Sunyaev-Zel'dovich (eSZ) sample, PLCKESZG115.71+17.52 and PLCKESZ G189.84-37.24. We observed each of these candidateswith Bolocam at 140 GHz from the Caltech Submm Observatory in October 2011. Theresulting images have white noise levels of ~30 {\mu}KCMB-arcmin in theircentral regions. We find a significant SZ decrement towards PLCKESZ G115.71.This decrement has a false detection probability of 5.3\times10-5, and wetherefore confirm PLCKESZ G115.71 as a cluster. The maximum SZ decrementtowards PLCKESZ G189.84 corresponds to a false detection probability of 0.027,and it therefore remains as an unconfirmed cluster candidate. In order to makeour SZ-derived results more robust, we have also analyzed data from theWide-field Infrared Survey Explorer (WISE) at the location of each clustercandidate. We find an overdensity of WISE sources consistent with otherclusters in the eSZ at the location of PLCKESZ G115.71, providing furtherevidence that it is a cluster. We do not find a significant overdensity of WISEsources at the location of PLCKESZ G189.84.

Bolocam Observations of Two Unconfirmed Galaxy Cluster Candidates from the Planck Early SZ Sample