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Search for Bursts of Gamma-Ray Emission from the Crab Pulsar in the Cos-B Data by Adaptive Cluster Analysis

  • R. Buccheri
  • M. Busetta
  • C. M. Carollo
Part of the Ettore Majorana International Science Series book series (EMISS, volume 40)

Abstract

The photon arrival times detected by COS-B around the direction of the Crab pulsar have been analyzed by an adaptive cluster method in order to search for short bursts of gamma-ray emission from the source. As a result, two clusters of 3 and 6 photon arrival times within 264 s and 1813s respectively were found with the corresponding residual phases having close correlation with the peaks of the Crab pulsed emission. The comparison with a similar analysis performed by using photon arrival times not correlated with the Crab direction shows that the events have chance occurrence probabilities of about 10-3 and therefore may be consistent with (rare) random fluctuations of the background. Finally, 3 σ upper limits on the existence of bursts of emission from the Crab are given.

Keywords

Residual Phase Crab Pulsar Chance Occurrence Phase Histogram Pulse Flux 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • R. Buccheri
    • 1
  • M. Busetta
    • 1
  • C. M. Carollo
    • 1
  1. 1.Istituto di Fisica Cosmica e Applicazioni dell’InformaticaConsiglio Nazionale delle RicerchePalermoItaly

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