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.
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© 1989 Plenum Press, New York
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Buccheri, R., Busetta, M., Carollo, C.M. (1989). Search for Bursts of Gamma-Ray Emission from the Crab Pulsar in the Cos-B Data by Adaptive Cluster Analysis. In: Di Gesù, V., Scarsi, L., Crane, P., Friedman, J.H., Levialdi, S., Maccarone, M.C. (eds) Data Analysis in Astronomy III. Ettore Majorana International Science Series, vol 40. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5646-2_7
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DOI: https://doi.org/10.1007/978-1-4684-5646-2_7
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