Abstract
KNOWLEDGE of the intensity of X-radiation from the early stages of a supernova is important to our understanding of the processes which take place during the outburst. With this in mind, two of us (H. O. and E. B.) have compared the celestial positions and times of occurrence of recently reported supernova outbursts with some recent surveys of the sky at X-ray wavelengths. It was noted that a high-sensitivity scan of the Virgo cluster of galaxies from an Aerobee rocket on July 7, 1967, by Bradt et al.1 occurred 6 days after the discovery of a supernova SN1961h in NGC4254 by Zwicky2.
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References
Bradt, H., Mayer, W., Naranan, S., Rappaport, S., and Spada, G., Astrophys. J. Lett., 150, L199 (1967).
Zwicky, F., IAU Circular No. 2021 (1967).
Humason, M. L., Mayall, N. V., and Sandage, A. R., Astron. J., 61, 144 (1956).
Bowyer, S., Byram, E. T., Chubb, T. A., and Friedman, H., Science, 146, 912 (1964).
O'Dell, C. R., Astrophys. J., 136, 809 (1962).
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BRADT, H., NARANAN, S., RAPPAPORT, S. et al. Upper Limit on X-rays from a New Supernova. Nature 218, 856–857 (1968). https://doi.org/10.1038/218856b0
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DOI: https://doi.org/10.1038/218856b0
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