1101+384 (MRK 421)

Coordinates 
R.A. = 11:04:27.2, Dec. = +38:12:32 (2000)
z = 0.030021

Field of view is 10’x10′

GASP suggested stars: 1 2 3

Comparison stars

Star	B	V	R	I
1	15.02 (0.03)	14.36 (0.02)	14.04 (0.02)	13.69 (0.01)
2	16.20 (0.04)	15.57 (0.05)	15.20 (0.03)	14.86 (0.01)
3	16.69 (0.03)	15.77 (0.03)	15.24 (0.03)

BVR from Villata et al. 1998, A&AS 130,305

I adapted from Doroshenko et al. 2007, Astrophysics, 50, 40

IMPORTANT: we recommend to use 7.5 arcsec for the aperture radius, which allows us to optimize the subtraction of the host galaxy contribution in the following data analysis.