Swift sees a return to quiescence in XMMSL1 J162940.2-112024: A possible massive stellar flare?
Abstract
XMMSL1 J162940.2-112024, a bright new X-ray transient discovered on Aug 20, 2008 by XMM-Newton in its Slew Survey mode [ATel #1689] has been observed by Swift for ~1.3 ksec on Sep 5, 2008. No significant emission is seen at the slew source position (RA:16 29 40.2, DEC:-11 20 24; err. 8''). A 2 sigma upper limit to the Swift-XRT (0.2-10 keV) count rate was calculated at <3.2e-3 ct/s. The optical and IR magnitudes of the brighter, and closer, of the two catalogued optical sources within the slew error circle, USNO-B1.0 0786-0301344, are consistent with a star of effective temperature 3600K and bolometric luminosity 6e-5 L(solar).
- Publication:
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The Astronomer's Telegram
- Pub Date:
- September 2008
- Bibcode:
- 2008ATel.1718....1R
- Keywords:
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- X-ray;
- Request for Observations;
- Transients;
- Stars