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M31GC J004234+405709 (Bol 117) Observed by Chandra Is a New Transient X-Ray Source in M31: CXOM31 J004234.2+405709

ATEL # 1820; J.L. Galache, M.R. Garcia, M.A.P. Torres, S.S. Murray (CfA), D. Steeghs (U. of Warwick/CfA) and B.F. Williams (U. of Washington)
on 29 Oct 2008; 23:20 UT
Password Certification: Jose Luis Galache (

Subjects: X-ray, Request for Observations, Binaries, Black Holes, Neutron Stars, Transients

In ATel #1815 we erroneously associated the globular cluster M31GC J004234+405709 (Bol 117) with object s1-1 from Williams et al. (2006, ApJ 643, 356). Bol 117 is not associated with any previously catalogued X-ray source, so the Chandra observation we report on in ATel #1815 is the first recorded detection of X-ray activity from Bol 117. The coordinates of this new X-ray source are RA(J2000) 00:42:34.2, Dec(J2000) +40:57:09.2, with centroid position errors of 2.5" and 1.3", respectively (subject to the standard bore-sight correction). The large uncertainty in the position is due to the source being located at the edge of the FoV on the S3 chip. We designate this source as CXOM31 J004234.2+405709.

We thank Dr Wolfgang Pietsch for kindly bringing the discrepancy to our attention.

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