A search for UHE cosmic ray from the Crab pulsar/nebula

Details A search for UHE cosmic ray from the Crab pulsar/nebula A search for UHE cosmic ray from the Crab pulsar/nebula

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..220..150a&link_type=abstract

High Energy Gamma-Ray Astronomy. AIP Conference Proceedings, Volume 220, pp. 150-153 (1991).

Astronomy and Astrophysics

Astronomy

1

Gamma-Ray Sources, Gamma-Ray Bursts, Pulsars

Scientific paper

A preliminary search is made for continuously pulsed, and burst, emission from the Crab pulsar or its nebula at ultra-high energies using the CYGNUS air shower experiment. No evidence is found for pulsed emission over the entire data set of 1,075 days searched. A 90% confidence upper limit for the flux of cosmic rays at the interpulse phase is 6.9×10-14 cm-2s-1 above 50 TeV. A single day (JD=2447644.5,UTC=66700s to JD=2447645.5,UTC=11200s), is found to have a 4.1 σ excess corresponding to a chance probability of 2.2% no evidence of the pulsar period is found on this day.

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