IXPE observation of the low-synchrotron peaked blazar S4 0954+65 during an optical-X-ray flare

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Volume 695 (March 2025)

A&A, 695 (2025) A99

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Table A.1.

Best-fit Swift-XRT and XMM-Newton results when individually fitting the spectra.

Instrument	Obs. ID	MJD	t_exp	Photon index	Flux	C-statistics	Theoretical C-statistics
Swift-XRT	00015977001	60050.2	1.573	$1 . 33_{- 0.11}^{+ 0.11}$ $1.33^{+0.11}_{-0.11}$	$8 . 8_{- 0.9}^{+ 0.9}$ $8.8^{+0.9}_{-0.9}$	106.04	186.43 ± 16.07
		00015977002	60053.0	1.801	$1 . 34_{- 0.13}^{+ 0.11}$ $1.34^{+0.11}_{-0.13}$	$7 . 0_{- 0.7}^{+ 1.0}$ $7.0^{+1.0}_{-0.7}$	124.63	153.38 ± 14.53
		00015977003	60060.0	1.281	$1 . 31_{- 0.10}^{+ 0.10}$ $1.31^{+0.10}_{-0.10}$	$13 . 7_{- 1.2}^{+ 1.3}$ $13.7^{+1.3}_{-1.2}$	178.81	205.77 ± 17.51
		00097199001	60087.0	0.931	$1 . 58_{- 0.14}^{+ 0.15}$ $1.58^{+0.15}_{-0.14}$	$7 . 6_{- 0.9}^{+ 1.0}$ $7.6^{+1.0}_{-0.9}$	113.87	112.41 ± 12.23
		00097199002	60088.0	0.862	$1 . 55_{- 0.17}^{+ 0.15}$ $1.55^{+0.15}_{-0.17}$	$6 . 7_{- 0.8}^{+ 1.1}$ $6.7^{+1.1}_{-0.8}$	84.18	100.31 ± 11.27
		00097199003	60089.0	0.804	$1 . 46_{- 0.14}^{+ 0.14}$ $1.46^{+0.14}_{-0.14}$	$8 . 8_{- 1.1}^{+ 1.3}$ $8.8^{+1.3}_{-1.1}$	86.1	106.60 ± 12.02
		00097199004	60090.0	0.969	$1 . 62_{- 0.11}^{+ 0.15}$ $1.62^{+0.15}_{-0.11}$	$8 . 8_{- 1.2}^{+ 0.8}$ $8.8^{+0.8}_{-1.2}$	119.44	142.18 ± 13.86
		00097199005	60091.1	1.004	$1 . 65_{- 0.19}^{+ 0.10}$ $1.65^{+0.10}_{-0.19}$	$8 . 9_{- 0.6}^{+ 1.8}$ $8.9^{+1.8}_{-0.6}$	92.74	146.15 ± 14.03
		00097199006	60092.1	0.764	$1 . 35_{- 0.17}^{+ 0.13}$ $1.35^{+0.13}_{-0.17}$	$8 . 9_{- 0.9}^{+ 1.7}$ $8.9^{+1.7}_{-0.9}$	92.47	103.63 ± 11.66
		00097199007	60093.0	0.762	$1 . 74_{- 0.17}^{+ 0.12}$ $1.74^{+0.12}_{-0.17}$	$12 . 3_{- 1.0}^{+ 2.1}$ $12.3^{+2.1}_{-1.0}$	85.84	123.22 ± 12.78
		00097199008	60094.0	0.782	$1 . 52_{- 0.08}^{+ 0.11}$ $1.52^{+0.11}_{-0.08}$	$21 . 6_{- 2.0}^{+ 1.5}$ $21.6^{+1.5}_{-2.0}$	233.57	227.68 ± 18.69
		00097199009	60095.6	1.004	$1 . 47_{- 0.09}^{+ 0.06}$ $1.47^{+0.06}_{-0.09}$	$27 . 7_{- 1.3}^{+ 2.4}$ $27.7^{+2.4}_{-1.3}$	249.49	300.64 ± 22.28
		00097199010	60096.2	0.986	$1 . 29_{- 0.08}^{+ 0.13}$ $1.29^{+0.13}_{-0.08}$	$20 . 4_{- 2.4}^{+ 1.3}$ $20.4^{+1.3}_{-2.4}$	174.99	232.06 ± 18.06
		00097199011	60097.1	0.984	$1 . 50_{- 0.10}^{+ 0.10}$ $1.50^{+0.10}_{-0.10}$	$15 . 6_{- 1.3}^{+ 1.4}$ $15.6^{+1.4}_{-1.3}$	157	209.34 ± 17.57
		00097199012	60098.1	0.734	$1 . 44_{- 0.15}^{+ 0.11}$ $1.44^{+0.11}_{-0.15}$	$12 . 5_{- 1.1}^{+ 2.0}$ $12.5^{+2.0}_{-1.1}$	107.05	146.10 ± 14.05
		00097199013	60099.1	1.349	$1 . 43_{- 0.11}^{+ 0.09}$ $1.43^{+0.09}_{-0.11}$	$11 . 7_{- 0.9}^{+ 1.3}$ $11.7^{+1.3}_{-0.9}$	177.9	201.01 ± 16.92
		00097199014	60100.0	0.892	$1 . 53_{- 0.18}^{+ 0.14}$ $1.53^{+0.14}_{-0.18}$	$7 . 9_{- 0.9}^{+ 1.4}$ $7.9^{+1.4}_{-0.9}$	73.04	94.25 ± 1.18
		00097199015	60101.3	0.832	$1 . 50_{- 0.14}^{+ 0.14}$ $1.50^{+0.14}_{-0.14}$	$10 . 7_{- 1.2}^{+ 1.4}$ $10.7^{+1.4}_{-1.2}$	113.84	120.44 ± 12.54
		00097199016	60102.2	1.184	$1 . 56_{- 0.11}^{+ 0.12}$ $1.56^{+0.12}_{-0.11}$	$9 . 8_{- 1.0}^{+ 1.0}$ $9.8^{+1.0}_{-1.0}$	115.5	181.46 ± 16.20

XMM-Newton	0920901901	60084.9	7.711	$1 . 548_{- 0.014}^{+ 0.014}$ $1.548^{+0.014}_{-0.014}$	$8 . 22_{- 0.11}^{+ 0.12}$ $8.22^{+0.12}_{-0.11}$	1622.47	1783.55 ± 59.28

Notes. The net exposure time (t_exp) is given in ks, and the unabsorbed flux is given in 10⁻¹² erg cm⁻² s⁻¹.

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