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ATEL # 1335; A. W. Shafter (SDSU)
on 18 Dec 2007; 1:45 UT
Password Certification: Allen W. Shafter (email@example.com)
Subjects: Optical, X-ray, Transients
Kong and Di Stefano (ATel #1333) report the discovery on 2007 Dec 13 UT of a supersoft X-ray transient (R.A.=00:42:09.9, Decl.=+40:57:48, J2000) discovered serendipitously during Swift observations of the supersoft source in the M31 globular cluster Bol 111 (Atel #1294). An R-band image taken with the Mount Laguna Observatory 1-m reflector approximately three days later on 2007 Dec 16.07 UT reveals no optical counterpart of this new transient to a limiting magnitude of R=20.