IGR J17503–2636: a candidate supergiant fast X-ray transient

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Volume 624 (April 2019)

A&A, 624 (2019) A142

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Table 1.

Log of X-ray observations with the best-fit spectral parameters.

TELESCOPE	START	STOP	EXP.	OBSID	n_H	Γ	PL Flux (2–10 keV) ^(a)	Cstat- /d.o.f. ^(b)	Flux (2–10 keV) ^(c)
	(UTC)	(UTC)	(ks)		(10²² cm⁻²)		(10⁻¹¹ erg cm⁻² s⁻¹)		(10⁻¹¹ erg cm⁻² s⁻¹)
INTEGRAL	2018-08-10 15:52	2018-08-11 19:20	54.5 ^(d)	N/A	<73			0.6/10	70
Swift/XRT	2018-08-13 19:43	2018-08-13 20:13	0.99	00010807001	13.0 ± 5.0	0.5±0.6		46.0/53	8.9
NICER	2018-08-14 21:23	2018-08-14 22:43	0.76	1200320101	26.0 ± 5.5	2.4 ± 0.6		175.0/131	2.1
NICER	2018-08-16 02:14	2018-08-16 13:19	2.89	1200320103	5.0 ± 1.3	0.4 ± 0.3		117.0/141	1.3
NuSTAR^(e)	2018-08-22 11:23	2018-08-23 10:29	39.1	90401333002	21.0 ± 2.5	0.49 ± 0.12		1.0258/324	2.3
Swift/XRT	2018-08-23 04:39	2018-08-23 06:38	1.85	00088805001		2 ± 2		42.0/48	1.5

Notes.

^(a)

Intrinsic flux of the pegpowerlaw component in the 2–10 keV energy range.

^(b)

For INTEGRAL and NuSTAR, we provide the reduced χ², for NICER and Swift/XRT, the C-stat.

^(c)

Absorbed model flux in the 2–10 keV energy range.

^(d)

This is the IBIS/ISGRI effective exposure corrected for dead time, while each JEM-X unit has an exposure of 6 ks.

^(e)

The reported parameters are for the absorbed power-law component only and model Gabs in Table 2 (we refer to Sect. 2.2 and Table 2 for the complete NuSTAR analysis).

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