SGR 1806-20
Abstract
K. Hurley, Space Sciences Laboratory, University of California, Berkeley, on behalf of the Ulysses Gamma-Ray Burst Team; C. Kouveliotou, Universities Space Research Association and Marshall Space Flight Center (MSFC), NASA; G. J. Fishman and C. A. Meegan, MSFC; and J. van Paradijs, University of Amsterdam and University of Alabama, Huntsville, report: "We have derived a much-refined position for the transient soft-gamma-ray repeater reported on IAUC 6501, via triangulation between Ulysses and BATSE of two bursts on Nov. 19. The position is an annulus whose radius is 76.990 deg, whose halfwidth is 0.0092 deg (3-sigma confidence level), centered at R.A. = 23h55m34s.9, Decl. = -30 55'55" (equinox 2000.0). The combined triangulation annuli and BATSE error circles give error boxes whose areas are more than a factor of 100 smaller than the BATSE error circles alone. They are consistent with the known position of SGR 1806-20 (Murakami et al. 1994, Nature 368, 127), and the two annuli midlines pass within 4" of this position. We conclude that the source of these bursts, as well as of the ones that have occured since Oct. 30, is indeed SGR 1806-20. The latest short, soft event from this source was detected with BATSE on Nov. 23, so continued monitoring at other wavelengths is strongly encouraged."
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- December 1996
- Bibcode:
- 1996IAUC.6512....2H