Abstract
IN a recent IAU circular telegram, Porter, Jennings and O'Mongain reported observations at Malta on January 19, 1969, of 3 nanosecond optical pulses coming from the vicinity of the Crab Nebula and having the periodicities of both NP 0532 and NP 05271. The reported angular diameter of their field of view was 28′, the detection threshold intensity was 30 photons m−2 and the counting rate was not given.
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References
Porter, N. A., Jennings, D. M., and O'Mongain, E. P., IAU Circular No. 2130 (1969).
Cocke, W. J., Disney, M. J., and Taylor, D. J., Nature, 221, 525 (1969).
Nather, R. E., Warner, B., and MacFarlane, M., Nature, 221, 527 (1969).
Lynds, R., Maran, S. P., and Trumbo, D. E., Astrophys. J., 155, L121 (1969).
Miller, J. S., and Wampler, E. J., Nature, 221, 1038 (1969).
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ANDERSON, J., CRAWFORD, F. & CUDABACK, D. Search for Nanosecond Optical Pulses from Crab Pulsar NP 0532. Nature 222, 861–862 (1969). https://doi.org/10.1038/222861a0
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DOI: https://doi.org/10.1038/222861a0
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