Object	UT Date	UT	JD	Comp Star	ΔV	σ(ΔV)	V	σ(V)
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)
Mrk 421	2012-02-21	09:08:04	2455978.88060	1	-1.486	0.008	12.87	0.02
W Com	2012-02-21	09:53:00	2455978.91181	A	3.165	0.002	15.24	0.04
PKS1222+216	2012-02-21	10:12:41	2455978.92547	1	1.753	0.004	15.94	0.04
3C 279	2012-02-21	10:33:08	2455978.93968	1	2.909	0.003	15.31	0.01
PKS1510-08	2012-02-21	11:40:02	2455978.98613	1	4.548	0.004	16.15	0.03
B2 1633+382	2012-02-21	12:17:00	2455979.01181	A	3.580	0.013	17.84	0.02
Mrk 501	2012-02-21	12:30:19	2455979.02105	A	1.344	0.002	13.95	0.01
1ES1959+650	2012-02-21	13:03:31	2455979.04411	2	1.839	0.002	14.70	0.02