Abstract
PRECISE (20–30″) positions of three steady X-ray sources which have been identified recently as X-ray burst sources 4U1636–53 = MXB1636–53 (refs 1, 2), 4U1728–33 = MXB1728–34 (refs 3, 4), and 4U1735–44 = MXB1735–44 (refs 5, 6, 7) are reported here. These positions, hereafter designated with a 2S prefix, have been derived from data obtained with the SAS-3 rotalting modulation collimators during a survey of the galactic plane8–10. The small solid angles of the error regions make possible a thorough survey of all potential optical, infrared, and radio counterparts of these burst sources. Two of these positions, 2S1636–536 and 2S1735–444, have led to the probable identifications of optical counterparts11.
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JERNIGAN, J., APPARAO, K., BRADT, H. et al. Positions of three X-ray burst sources. Nature 270, 321–323 (1977). https://doi.org/10.1038/270321a0
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DOI: https://doi.org/10.1038/270321a0
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