NASA NTRS · 19730058320
New transient source, Cepheus X-4, observed by OSO-7.
Abstract
A new, apparently transient, X-ray source, Cep X-4, was observed from June 20 to July 7, 1972, by the UCSD X-ray telescope on OSO-7. Subsequent observations by the lower-energy MIT X-ray telescope on the same satellite confirmed the source and provided an improved position of alpha = 21 hr 37 min, delta = 56.78 deg (1950 coordinates) with an error circle radius of about 0.4 deg. Best fits to the UCSD data in the 7- to 37-keV range were obtained on June 20 to 28 and June 29 to July 6, 1972, respectively.
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Ulmer, M. P., Baity, W. A., Wheaton, W. A., Peterson, L. E.. 1973-09-15. New transient source, Cepheus X-4, observed by OSO-7.. https://ntrs.nasa.gov/citations/19730058320
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