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Swift Observations of the Supersoft X-ray Transient in the M31 Globular Cluster Bol 111
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Swift Observations of the Supersoft X-ray Transient in the M31 Globular Cluster Bol 111

A. K. H. Kong and R. Di Stefano
The Astronomer's Telegram
2007

Abstract

X-ray;Novae;Transients
We report follow-up Swift observations of the supersoft X-ray transient in the M31 globular cluster Bol 111 (ATel #1294). Bol 111 was observed with Swift on 2007 Dec 13, 14, and 15. The source is still active and appears to rebrighten. In the two Swift observations taken on 2007 Nov 18, the source has a count rate of 0.0085 c/s with all counts below 0.6 keV (ATel #1294). The count rate of the supersoft source drops to 0.0045+/-0.0011 c/s on 2007 Dec 13 while on 2007 Dec 14 and 15, the source brightens to 0.0086+/-0.0017 c/s and 0.0092+/-0.0017 c/s, respectively with all photons below 1 keV.

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