Abstract
WE report here a search in the direction of the radio pulsar CP 1919 (ref. 1) which has resulted in upper limits on possible X-ray emission from this object at 3.9 × 10−33 J m−1 Hz−1 per pulse over the 30–100 keV range.
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GRUBER, D., MATTESON, J., PELLING, M. et al. Upper Limits for CP 1919 X-ray Emission. Nature 226, 532–534 (1970). https://doi.org/10.1038/226532b0
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DOI: https://doi.org/10.1038/226532b0
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