Table 1.
Properties of the archival observations of J1231 used in this work.
| Satellite | ObsID (Label) | Date | Exposure (ks) | Energy range (keV) | Est. # Source counts |
|---|---|---|---|---|---|
| XMM-Newton | 0145800101 (X1) | 2003/07/13 | 36.5 (pn) / 45.3 (MOS) | 0.3–1.0 | 1026 |
| 0306630101 (X2) | 2005/12/13 | 52.9 (pn) / 65.0 (MOS) | 0.3–2.0 | 3094 | |
| 0306630201 (X3) | 2005/12/17 | 80.6 (pn) / 90.8 (MOS) | 0.3–2.0 | 3459 | |
| Swift | 00032732001–00032732011 (S1) | 2013/03/08–2014/07/27 | 51.2 (XRT) | 0.3–1.0 | 17 |
| Chandra | 17129 (C1) | 2016/02/10 | 39.5 (ACIS) | 0.3–7.0 | 9 |
Notes. Labels of observing epochs are given in brackets following the observation ID. Swift obtained 11 exposures between 2013 March and 2014 July. In our analysis, we average these data and treat them as a single epoch (Epoch S1). For the XMM-Newton epochs, the exposure times are given after filtering out periods of enhanced background radiation. This filtering is performed separately for each of the two instruments used, as indicated in brackets following the exposure time. For each spectrum, the energy band used in our spectral analysis is also give; data bins where the background count rate exceeds the source count rate are discarded. See Appendix A for data reduction details. The last column gives the estimated net source counts in the given energy bands (the XMM-Newton pn and MOS (Metal Oxide Semi–conductor) counts are summed).
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