Swift/BAT detects renewed activity from 4U 1954+31
Abstract
The Swift/BAT hard X-ray transient monitor reports increased activity in the 15-50 keV band for the symbiotic X-ray binary 4U 1954+31, which likely contains a pulsar with a 5-hour period (Corbet et al, ApJ 675, 1424, 2008). Starting on about 2008-08-09 (MJD 54687), the source has been steadily increasing in intensity from an undetectable level (one-sigma upper limit of 0.002 cts/cm2/sec or 8 mcrab) up to a current level of 0.013 ± 0.002 cts/cm2/sec (58 mcrab) on 2008-09-25.
- Publication:
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The Astronomer's Telegram
- Pub Date:
- September 2008
- Bibcode:
- 2008ATel.1742....1K
- Keywords:
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- X-ray;
- Binaries;
- Pulsars;
- Transients