VLT-FORS1 observations of the host galaxy of GRB 990705
P. Saracco, G. Chincarini, S. Covino, G. Ghisellini, M. Longhetti, F.
(Osservatorio Astronomico di Brera, Merate, Italy)
D. Lazzati (Institute of Astronomy,Cambridge, UK)
P. Severgnini (Osservatorio Astronomico di Arcetri, Firenze, Italy)
We have obtained twelve 540-second dithered images in the Rc (Bessell)
band centered on the position of GRB 990705. These images have been
obtained from 20th to 28th December 2000 at the ESO-VLT UT1 telescope
with FORS1 as a part of a survey of host galaxies (Saracco et al. 2000;
Prog. ID: 66.B-0539(A)).
Observations have been carried out under seeing conditions of 0.6-0.7
The limiting magnitude reached on the final coadded image is Rc=26.6
(3 sigmas within the seeing disk).
We confirm the presence of a late-type (Sc) galaxy located at the
GRB 990705 as previously found by Holland et al. (2000; GCN #753).
We measure a magnitude Rc=22.2(+-0.1) (galactic extinction A(R)=0.2)
within an aperture radius of 2 arcsec.
Considering the V-band aperture magnitude obtained by Holland et al.
(GCN #753) we estimate for the host galaxy a color V-Rc=0.6(+-0.2).
Given the large uncertainty in this estimate, such a color is
consistent with that of an Sc galaxy at redshift z<1.3.
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