Table 1
X-ray observations of the M31N 2007-12b field around and after the optical nova outburst.
| Observatory | Instr. | ObsID | Obs. start | Exposure | Δta | Count rateb | LXcb | Comment |
| (UT) | (ks) | (d) | (ct ks-1) | (1037 erg s-1) | ||||
|
|
||||||||
| Chandra | HRC-I | 8529 | 2007–12–07.57 | 19.1 | –1 | < 1.3 | < 1.2 | off |
| Swift | XRT | 00031027004 | 2008–12–16.78 | 3.9 | 8 | < 3.9 | < 9.2 | off |
| Chandra | HRC-I | 8530 | 2007–12–17.49 | 20.2 | 8 | < 0.9 | < 0.8 | off |
| XMM-Newton | EPIC pn | 0505720201 | 2007–12–29.57 | 22.3 | 21 | 1.0 ± 0.4 | 0.11 | faint |
| Swift | XRT | 00031027005 | 2008–12–30.02 | 4.0 | 21 | < 3.4 | < 8.0 | off or faint |
| XMM-Newton | EPIC pn | 0505720301 | 2008–01–08.29 | 22.1 | 30 | 260 ± 3 | 77 | bright, dip |
| Swift | XRT | 00031027006 | 2008–01–13.74 | 4.0 | 36 | 15 ± 2 | 35 | bright |
| XMM-Newton | EPIC pn | 0505720401 | 2008–01–18.63 | 18.2 | 41 | 395 ± 5 | 61 | bright, dip |
| XMM-Newton | EPIC pn | 0505720501 | 2008–01–27.94 | 17.3 | 50 | 479 ± 5 | 76 | bright, dip |
| XMM-Newton | EPIC pn | 0505720601 | 2008–02–07.21 | 17.4 | 60 | 291 ± 4 | 37 | bright |
| Swift | XRT | 00037719001 | 2008–05–26.71 | 4.9 | 170 | < 2.3 | < 5.4 | off |
| XMM-Newton | EPIC pn | 0560180101 | 2008–07–18.26 | 17.4 | 222 | < 1.5 | < 0.1 | off |
Notes.
0.15–1.0 keV absorption corrected luminosity assuming an absorbed black-body spectrum as determined in the spectral fit (see Table 5). For observations where spectral fitting was not possible, we assumed a black-body spectrum with NH = 1.0 × 1021 cm-2 and a temperature kT = 60 eV. We use a distance of M 31 of 780 kpc (Holland 1998; Stanek & Garnavich 1998) throughout the paper.
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