A remarkable recurrent nova in M 31: The predicted 2014 outburst in X-rays with Swift

M. Henze; J.-U. Ness; M. J. Darnley; M. F. Bode; S. C. Williams; A. W. Shafter; G. Sala; M. Kato; I. Hachisu; M. Hernanz

doi:10.1051/0004-6361/201526028

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Volume 580 (August 2015)

A&A, 580 (2015) A46

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Table 1

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

ObsID	Exp^a	Date^b	MJD^b	Δt ^c	UV^d [mag]			Rate	L_0.2−1.0^e
	[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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