Crab pulsar giant pulses: Simultaneous radio and GRO observations

Details Crab pulsar giant pulses: Simultaneous radio and GRO observations Crab pulsar giant pulses: Simultaneous radio and GRO observations

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..260l&link_type=abstract

In NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop p 260-266 (SEE N92-21874 12-90)

Astronomy and Astrophysics

Astronomy

2

Gamma Ray Astronomy, Gamma Ray Spectrometers, Histograms, Pulsars, Radio Frequencies, Radio Telescopes, Scintillation Counters, Ephemerides, Gamma Ray Observatory, Radio Observation, Time Measurement, Waveforms

Scientific paper

Observations are reported of the Crab pulsar made at radio frequencies concurrent with Oriented Scintillation Spectrometer Experiment (OSSE) observations from 15 to 27 May 1991. Using the 43 m telescope at Green Bank at 0.8 and 1.4 GHz, samples were made continuously for 10 hrs/day at intervals of 100 to 300 microsecs. The analysis of the radio data includes calculation of histograms of pulse intensities, absolute timing to about 20 microsec precision, and characterization of intensity variations on time scales from the 33 ms spin period to days. The most detailed analysis is presented made of giant pulses. The ultimate goal is to bin the radio data into giant and nongiant pulses and to form average waveforms of OSSE data for the corresponding pulse periods. A test is done to see whether the violet radio fluctuations (which are not seen in other radio pulsars to the same degree) are correlated with low energy gamma rays, yielding constraints on the radio coherence mechanism and the steadiness of the electron-positron outflow in the magnetosphere. Timing analysis of the radio data provides a well defined ephemeris over the specified range of epochs. The gamma ray pulse phase was predicted with an error of less than 70 microsecs.

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