Abstract
ON 1974 June 21 we observed the Crab Nebula with a balloon-borne X-ray telescope (20–150 keV) with a sensitive area of ∼700 cm2. The observations took place between UT 54112 S and 78520 S. At times during this period a transitory third peak was observed in the light curve of NP0532, which we have reported earlier10. The peak comprised 2.0±0.5% of the total emission from the Crab, and was detectable for ∼5 min on two occasions (∼40 min apart). We also report pulsed fractions in the primary and secondary peaks, and in the interpulse region.
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RYCKMAN, S., RICKER, G., SCHEEPMAKER, A. et al. Transient structure in the high-energy X-ray light curve of NP 0532. Nature 266, 431–433 (1977). https://doi.org/10.1038/266431a0
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DOI: https://doi.org/10.1038/266431a0
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