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Table 1

Swift observations of nova M31N 2008-12a following the 2014 outburst.

ObsID Expa Dateb MJDb Δt c UVd [mag] Rate L0.2−1.0e
[ks] [UT] [d] [d] uvm2 uvw1 uvw2 [10-2 ct s-1] 1038 erg s-1]

00032613042 7.9 2014-10-03.63 56 933.63 0.94 17.2 ± 0.1 < 0.2 < 0.2
00032613043 7.9 2014-10-04.44 56 934.44 1.75 18.3 ± 0.1 < 0.2 < 0.1
00032613045 3.9 2014-10-05.16 56 935.16 2.47 19.4 ± 0.1 < 0.4 < 0.3
00032613046 1.8 2014-10-06.02 56 936.02 3.33 < 0.6 < 0.4
00032613047 7.3 2014-10-07.35 56 937.35 4.66 19.6 ± 0.1 < 0.2 < 0.2
00032613048 6.9 2014-10-08.29 56 938.29 5.60 20.4 ± 0.2 0.7 ± 0.1 0.5 ± 0.1
00032613049 4.4 2014-10-09.02 56 939.02 6.33 20.0 ± 0.2 2.2 ± 0.2 1.6 ± 0.2
00032613051 4.4 2014-10-10.09 56 940.09 7.40 3.0 ± 0.3 2.3 ± 0.2
00032613050 6.5 2014-10-10.35 56 940.35 7.66 20.6 ± 0.2 3.2 ± 0.2 2.4 ± 0.2
00032613052 7.7 2014-10-12.04 56 942.04 9.35 21.1 ± 0.4 > 20.1 3.9 ± 0.3 2.9 ± 0.2
00032613054 1.8 2014-10-13.56 56 943.57 10.88 > 20.4 4.0 ± 0.5 3.0 ± 0.4
00032613055 5.3 2014-10-14.04 56 944.04 11.35 3.2 ± 0.3 2.4 ± 0.2
00032613056 1.6 2014-10-15.42 56 945.42 12.73 > 20.6 3.5 ± 0.5 2.6 ± 0.4
00032613057 4.8 2014-10-17.36 56 947.36 14.67 > 20.9 2.8 ± 0.3 2.1 ± 0.2
00032613058 2.2 2014-10-18.75 56 948.75 16.06 2.0 ± 0.4 1.5 ± 0.3
00032613059 4.1 2014-10-19.31 56 949.31 16.62 > 21.2 0.9 ± 0.2 0.7 ± 0.1
00032613060 4.7 2014-10-20.03 56 950.04 17.35 21.0 ± 0.4 0.4 ± 0.1 0.3 ± 0.1
00032613061 5.8 2014-10-21.42 56 951.42 18.73 > 21.1 < 0.3 < 0.2
00032613062 6.1 2014-10-22.03 56 952.03 19.34 < 0.2 < 0.2

Notes.

(a)

Dead-time corrected exposure time;

(b)

start date of the observation;

(c)

time in days after the outburst of nova M31N 2008-12a in the optical on 2014-10-02.69 UT (MJD 56932.69; see Sect. 3.1);

(d)

Swift UVOT filters were uvm2 (166–268 nm), uvw1 (181–321 nm), and uvw2 (112–264 nm);

(e)

X-ray luminosities (unabsorbed, blackbody fit, 0.2–10.0 keV) and upper limits were estimated according to Sect. 3.

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