  On 2006 August 23 the Crab Pulsar underwent a glitch, that was reported by
the Jodrell Bank and the Xinjiang radio observatories. Neither data are
available to the public. However, the Jodrell group publishes monthly arrival
times of the Crab Pulsar pulse (their actual observations are done daily),
using which it is shown that about five months earlier, the Crab Pulsar most
probably underwent a small glitch, which has not been reported before. Neither
observatory discusses the detailed analysis of data from 2006 March to August;
either they may not have detected this small glitch, or may have attributed it
to timing noise in the Crab Pulsar. The above result is verified using X-ray
data from the RXTE observatory. If this is indeed true, this may probably be
the smallest glitch observed in the Crab Pulsar so far, whose implications are
discussed. This work addresses the confusion possible between small magnitude
glitches and timing noise in pulsars.
