Positions of three X-ray burst sources
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.
- Publication:
-
Nature
- Pub Date:
- November 1977
- DOI:
- 10.1038/270321a0
- Bibcode:
- 1977Natur.270..321J
- Keywords:
-
- Astrometry;
- Position (Location);
- X Ray Sources;
- Astronomical Catalogs;
- Astronomical Coordinates;
- Collimators;
- Sas-3;
- Satellite Observation;
- Astronomy