Polarisation of very-low-mass stars and brown dwarfs - I. VLT/FORS1 optical observations of field ultra-cool dwarfs

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Table 2:

Observing log.
Target	Date	Filt.	Seeing¹	${\it SNR}^2$	$t_{\rm exp}$	$N_\theta^3$
			('')		(s)
DENIS J2200	01/08/05	I	1.7	720	160	3
Kelu 1 AB	02/08/05	I	1.4	529	200	2
	02/08/05	z	1.6	243	200	2
2MASS J0036	01/08/05	R	1.5	706	600	3
	01/08/05	I	1.7	677	150	3
	10/08/06	I	1.3	785	150	4
	11/08/06	I	0.9	937	150	4
2MASS J2158	01/08/05	I	1.2	189	300	3
	02/08/05	z	1.0	350	400	3
LHS 102BC	01/08/05	I	1.2	186	130	2
	02/08/05	I	0.9	192	180	2
	02/08/05	z	0.9	532	200	3
	28/07/06	I	1.2	890	150	4
2MASS J1507	01/08/05	R	1.0	491	200	3
	01/08/05	I	1.0	783	160	3
DENIS J2252	02/08/05	I	1.0	428	600	3
2MASS J2244	02/08/05	z	1.1	124	600	2
	19/08/06	I	0.8	222	300	3
	21/08/06	I	0.9	214	300	3
	22/08/06	I	0.8	229	300	3
$\epsilon$ Indi Bab	01/08/05	I	1.2	422	150	3

¹ The seeing is calculated from the average ${\it FWHM}$ of the science target in the given night. ² Signal-to-noise ratio ( ${\it SNR}$ ), averaged for each target over a night. ³ Number ( $N_\theta$ ) of exposures per retarder angle.

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