COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses - XIV. Time delay of the doubly lensed quasar SDSS J1001+5027

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Table 1

Summary of COSMOGRAIL observations of SDSS J1001+5027.

Telescope	Camera	FoV	Pixel scale	Monitoring period	Epochs	Exp. time^a	Sampling^b

Mercator 1.2 m	MEROPE	6.5′ × 6.5′		2005 Mar.–2008 Dec.	239	5 × 360 s	3.8 (2.0) d
HCT 2.0 m	HFOSC	10′ × 10′		2005 Oct.–2011 Jul.	143	4 × 300 s	9.5 (6.1) d
Maidanak 1.5 m	SITE	8.9′ × 3.5′		2005 Dec.–2008 Jul.	41	7 × 180 s	5.9 (4.1) d
Maidanak 1.5 m	SI	18.1′ × 18.1′		2006 Nov.–2008 Oct.	20	6 × 600 s	12.6 (9.5) d

Combined				2005 Mar.–2011 Jul.	443	201.5 h	3.8 (1.9) d

Notes

^(a)

The exposure time is given by the number of dithered exposures per epoch and their individual exposure times.

^(b)

The sampling is given as the mean (median) number of days between two consecutive epochs, excluding the seasonal gaps.

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