Giant Pulses from the Millisecond Pulsar B1821−24

We have carried out a survey for `giant pulses' in 5 millisecond pulsars. Wedetect individual pulses from the high Edot pulsar PSR B1821-24 with energiesexceeding 50x the mean pulse energy. These giant pulses are concentrated in anarrow phase window coincident with the power-law non-thermal pulse seen inhard X-rays. This is the third example of the giant pulse phenomenon. Itsupports the idea that large B fields in the outer magnetosphere are criticalto the formation of such pulses and further suggests a direct connectionbetween giant pulses and high energy emission.Comment: 6pp, 3 figures. To Appear in ApJ Letters, Vol 55