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Published online by Cambridge University Press: 25 May 2016
The 3-ms, X-ray pulsar RX J1824.2-2R52P has been identified at the 2-σ level as a possible X-ray counterpart of the radio pulsar PSR 1821-24. The present work uses archival HST data for M28 to set upper limits on the optical V-band magnitude of PSR 1821–24 / RX J1824.2-2R452P. The optical limit extends the multiwavelength observations for this source and would provide constraints for theoretical models of pulsar emission.