X-Ray Flare
Abstract
S. S. Holt and L. J. Kaluzienski, Goddard Space Flight Center, report the observation of an x-ray nova with the Ariel 5 all-sky monitor. The best position is R.A. = 1h14m, Decl. = +63o.4 (equinox 1950.0) with a 90-percent-confidence error circle of radius 1o.5. The source first appeared above the all-sky-monitor detection threshold of 0.1 Crab (at 3-6 keV) on 1977 Dec. 30, and its intensity through 1978 Jan. 11 has steadily increased at a daily rate of ~ 0.025 Crab. G. Clark and L. Cominsky, Massachusetts Institute of Technology, have independently reported the detection of a hard x-ray flare within an error circle of radius 0o.5 centered at R.A. = 1h16m.0, Decl. = +63o15' (equinox 1950.0). They suggest that the source is a recurrence of the transient 4U 0115+63 (Forman et al. 1976, Astrophys. J. 206, L29). It was first detected by SAS 3 on Jan. 5.8 UT at a flux equal to 0.17 Crab (at 2-10 keV). The x-ray emission is pulsed with a period of ~ 3.6 seconds.
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- January 1978
- Bibcode:
- 1978IAUC.3161....1H