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

ATel #1344; A. K.H. Kong (NTHU), R. Di Stefano (CfA)
on 27 Dec 2007; 16:10 UT
Credential Certification: Albert Kong (akong@cfa.harvard.edu)

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We report follow-up Swift observations of the supersoft X-ray transient in the M31 globular cluster Bol 111 (see ATel #1333). Bol 111 was observed with Swift on 2007 Dec 20, 22, and 24. The source is still active with all photons less than 1 keV and shows variation in brightness. Combining with the Swift observations taken on 2007 Dec 13-15 (ATel #1333), the following XRT photon-counting mode count rates (0.3-1 keV) were measured:

2007 Dec 13: 0.0045+/-0.0011 c/s
2007 Dec 14: 0.0086+/-0.0017 c/s
2007 Dec 15: 0.0092+/-0.0017 c/s
2007 Dec 20: 0.0071+/-0.0018 c/s
2007 Dec 22: 0.0037+/-0.0013 c/s
2007 Dec 24: 0.0071+/-0.0018 c/s

We would like to thank the Swift team for the scheduling of the observations.