Abstract
DURING routine observations of the Crab Nebula by Ariel V, experiment A, the rotation modulation collimator (RMC), discovered a new X-ray source A0535+26. The source was just detectable during the first observation on April 13, and during the 16 d of observation was seen to brighten to nearly twice the Crab's intensity (in the 3–7 keV range). The source varies periodically, with a period of 104 s, and has a very flat spectrum in the 3–7 keV range.
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References
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ROSENBERG, F., EYLES, C., SKINNER, G. et al. Observations of a transient X-ray source with a period of 104 s. Nature 256, 628–630 (1975). https://doi.org/10.1038/256628a0
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DOI: https://doi.org/10.1038/256628a0
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