Late-time observations of the extraordinary Type II supernova iPTF14hls

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Table 2.

Swift observations of iPTF14hls.

Start Date	Phase^a	XRT Exposure time	Count rate limit	Flux limit	Luminosity limit
(UT)	(days)	(s)	(10⁻³ counts s⁻¹)	(10⁻¹⁴ erg cm⁻² s⁻¹)	(10⁴¹ erg s⁻¹)
2015-05-23 01:10:59	+234.45	4941.9	0.87	3.1	0.91
2017-06-14 02:37:57	+962.47	4488.1	0.92	3.4	0.99
2017-11-02 23:58:57	+1099.6	4781.4	0.94	3.4	0.99
2017-11-07 01:31:57	+1103.6	3079.0	2.92	10.6	3.1
2017-12-19 03:39:57	+1144.3	4280.0	1.45	5.3	1.5
2018-02-07 07:17:56	+1192.7	6075.2	0.75	2.7	0.79
2018-02-08 08:42:57	+1193.8	1995.8	1.96	7.1	2.1
2018-02-11 00:30:57	+1196.3	3783.5	1.22	4.4	1.3

Notes. The 90% upper limits are given for the 0.3–10.0 keV range. The flux limits further assume a power-law spectrum with photon index of Γ = 2 and a Galactic hydrogen column density of 1.4 × 10²⁰ cm⁻².

^(a)

Rest-frame days from discovery.

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