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Table 2

XMM-Newton OM and Swift UVOT observations of the M31N 2007-12b field around and after the optical nova outburst.

Observatory Instr. ObsID Obs. start Filters Exposure Δta Brightnessb
(UT) (s) (d) (mag)

Swift UVOT 00031027002 2008–12–02.64 U 1002 –6  > 19.8
Swift UVOT 00031027003 2008–12–03.25 UVW1 375 –6  > 19.3
UVM2 399 –6  > 19.5
UVW2 399 –6  > 19.6
Swift UVOT 00031027004 2008–12–16.78 UVM2 3853 8 17.82 ± 0.04
XMM-Newton OM 0505720201 2007–12–29.57 UVW1 4800 21 19.92 ± 0.03
Swift UVOT 00031027005 2008–12–30.02 U 3977 21 19.77 ± 0.18
XMM-Newton OM 0505720301 2008–01–08.29 UVW1 4720 30 20.27 ± 0.16
Swift UVOT 00031027006 2008–01–13.74 UVM2 841 36  > 19.9
XMM-Newton OM 0505720401 2008–01–18.63 UVW1 3500 41 20.62 ± 0.05
XMM-Newton OM 0505720501 2008–01–27.94 UVW1 3300 50  > 20.5
XMM-Newton OM 0505720601 2008-02–07.21 UVW1 3680 60  > 20.5

Notes.  .

(a)

Time after optical outburst (assumed 2007 December 9.0 UT);

(b)

Swift magnitudes in UVOT photometric system (Poole et al. 2008), for XMM-Newton OM instrumental magnitudes

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