NICER X-ray activity shows GX 339-4 undergoing a rapid state transition
Abstract
GX 339-4 is a black hole X-ray binary that started a new outburst in the last week of January 2021 (ATel #14351, #14367, #14352, #14354). After that, the source slowly brightened for 2 months while remaining in the hard state, as suggested by X-ray spectral and timing properties (ATel # 14384, #14400, #14440, #14455, #14484), and optical monitoring (ATel #14419).
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- March 2021
- Bibcode:
- 2021ATel14490....1W
- Keywords:
-
- Black Hole;
- Transient