The column density towards LMC X-1 | Astronomy & Astrophysics (A&A)

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Table 1:

Log of recent soft X-ray observations of LMC X-1 with good S/N. (Instruments not considered here are in parenthesis.)
Obs.	Start date	Start date	Exposure	${\phi_{\rm orb}^{(\rm T3)}}$ $^{\dagger}$	${\phi_{\rm orb}^{(\rm F9)}}$ $^{\ddagger}$	Satellite	ObsID	Instruments
		(MJD)	(ks)
C1	2000-01-16	51559.2	19	0.45-0.51	0.50-0.56	Chandra	93	HETGS
X1	2000-10-21	51838.7	5-7	0.94-0.96	0.98-0.01	XMM	0112900101	PN, RGS 1+2, (MOS 1+2)
X2	2002-09-26	52543.2	35	0.17-0.28	0.21-0.32	XMM	0023940401	RGS 1+2, (MOS 1+2)
S1	2007-10-31	54404.7	2.4	0.37-0.42	0.37-0.43	Swift	00037079001	(BAT), XRT/PC, (UVOT)
S2	2007-12-06	54440.4	9.8	0.49-0.61	0.50-0.62	Swift	00037079002	(BAT), XRT/WT, (UVOT)
S3	2007-12-10	54444.1	4.4	0.43-0.50	0.43-0.50	Swift	00037079003	(BAT), XRT/WT, (UVOT)

Notes. $^{(\dagger)}$ Orbital phase calculated from the ephemeris of Orosz et al. (2009, Table 3): $T_0={\rm MJD}\;53~390.8436$ , P=3.90917 d; $^{(\ddagger)}$ orbital phase calculated from the ephemeris of Orosz et al. (2009, Fig. 9): $T_0={\rm MJD}\;53~390.75174$ , P=3.9094 d.

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