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We report on the detection of extreme giant pulses (GPs) from one of theoldest-known pulsars, the highly variable PSR B0950+08, with theAmsterdam-ASTRON Radio Transient Facility And Analysis Centre (AARTFAAC), aparallel transient detection instrument operating as a subsystem of the LOwFrequency ARray (LOFAR). During processing of our Northern Hemisphere surveyfor low-frequency radio transients, a sample of 275 pulses with fluencesranging from 42 to 177 kJy ms were detected in one-second snapshot images. Thebrightest pulses are an order of magnitude brighter than those previouslyreported at 42 and 74 MHz, on par with the levels observed in a previouslong-term study at 103 MHz. Both their rate and fluence distribution differbetween and within the various studies done to date. The GP rate is highlyvariable, from 0 to 30 per hour, with only two three-hour observationsaccounting for nearly half of the pulses detected in the 96 h surveyed. It doesnot vary significantly within a few-hour observation, but can vary strongly onefrom day to the next. The spectra appear strongly and variably structured, withemission sometimes confined to a single 195.3 kHz subband, and the pulsespectra changing on a timescale of order 10 min.

Long-term study of extreme giant pulses from PSR B0950+08 with AARTFAAC