A bright transient X-ray source, V0332+53, was observed by Vela 5B for 3 months in 1973. It was first clearly detected in the 10 day period centered on 1973 June 1, rose to an intensity of ≡1.4 Crab in July, and was last definitely observed around 1973 August 30. The slow rise and symmetric fall of intensity are unusual for a transient X-ray source. Rapid fluctuations took the source to peak intensities above 2 Crab. The spectrum of this source was among the hardest ever observed by Vela 5B. The location of V0332+53, in Camelopardalis, was l = 146°.11, b = -2°.16, with an uncertainty of ≡0°.1.
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Terrell et al. (1984) studied this question.