4XMM J181330.1−175110: A new supergiant fast X-ray transient

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Table 1.

X-ray observations.

Satellite	ObsID	Exposure ^(a)	Detected ^(a)
		(ks)	(10⁻¹³ erg cm⁻² s⁻¹)
XMM-Newton	0302450201	16	< 0.77 ^(b)
XMM-Newton	0552790101	99	Y
Chandra	6685	30	Y
Chandra	17440	17	Y
Chandra	17695	13	Y
Swift^(c)	00035115002	7	< 3
Swift^(c)	03110848001	5	< 4
Swift^(c)	00035115001	3	< 5
NuSTAR	30364003002	29	< 0.73 ^(d)

Notes. Log of the X-ray observations.

^(a)

Detection of the 3σ upper limit unabsorbed flux in the 2–10 keV band, using the spectrum described in Sect. 3.2.

^(b)

For this upper limit, we conservatively used only the pn camera in the 2–12 keV energy range; no proton flares were detected during this observation.

^(c)

Swift-XRT upper limits and detections were performed using, respectively, (https://www.swift.ac.uk/2SXPS/ulserv.php and https://www.swift.ac.uk/user_objects/) (Evans et al. 2020), when available, using HEASoft v.6.32.

^(d)

For this upper limit, we combined the FPMA and FPMB cameras using a good-quality events FITS file in the 2–10 keV energy band. We note that the source area is contaminated by the nearby PSR J1813−1749 system.

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