Amendment to ATel 1859: CXOM31 J004245.9+411036 is Previously Reported XMMU J004245.9+411036
ATel #1870; 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 8 Dec 2008; 19:19 UT
Credential Certification: Jose Luis Galache (firstname.lastname@example.org)
Subjects: Binary, Black Hole, Neutron Star, Transient, Pulsar
The object CXOM31 J004245.9+411036, reported as a new X-ray source in ATel #1859 from M31 Chandra observations, is the previously reported XMMU J004245.9+411036 (Pietsch et al. 2008, ATel #1647). We thank W. Pietsch and M. Henze for kindly bringing this clerical error to our attention.
This transient source has been observed by various space telescopes since its discovery. We present a table with known observations and the X-ray luminosity in the 0.5-5 keV range. All spectra were fit with an absorbed power law and we also present the slope reported.
*: Slope was fixed at this value and was not a free parameter in the fit.
|Date (UT) ||Lx (Ã1e37 erg/s) ||Γ ||Satellite (Ref.) |
|2008-05-26.30 ||2.7 ||2.4* ||Swift (ATel #1671) |
|2008-05-31.47 ||3.5 ||1.7* ||CXO (ATel #1658) |
|2008-07-15.70 ||1.4 ||2.4 ||CXO (ATel #1658) |
|2008-07-18.26 ||4.2 ||2.4 ||XMM (ATel #1647) |
|2008-08-21.31 ||5.4 ||2.4* ||Swift (ATel #1674) |
|2008-10-21.63 ||6.1 ||2.4* ||Swift (ATel #1806) |
|2008-09-01.32 ||3.1 ||2.6 ||CXO |
|2008-10-13.15 ||0.3 ||2.4* ||CXO |
|2008-11-27.72 ||3.6 ||1.8 ||CXO (ATel #1859) |
Based on its transient nature and the soft spectrum reported in most of the observations, we suggest XMMU J004245.9+411036 might be a black hole transient.