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The Crab-like SNR G21.5-0.9 was observed in the X-ray band (0.5-10 keV) bythe XMM-Newton satellite for over 100 ks. The large effective area of the EPICinstrument has allowed us to to perform a deep search for pulsations from thecentral core of G21.5-0.9. No pulsations were found with upper limits on thepulsed fraction between 7.5 % and 40 % (depending on frequency and energyrange).Comment: 3 pages, latex, 2 tables, no figures, accepted for publication by A&

Timing analysis of the core of the Crab-like SNR G21.5–0.9