GCN Circular 7157
Subject
GRB 071227: optical afterglow
Event
Date
2008-01-02T10:19:36Z (18 years ago)
From
Paolo D'Avanzo at INAF-OAB <paolo.davanzo@brera.inaf.it>
P. D'Avanzo, S. Covino, D. Fugazza, G. Tagliaferri (INAF-OAB), G.
Chincarini (Univ. Bicocca), S. Piranomonte, V. D'Elia, L. Stella
(INAF-OAR) and A. Moretti (INAF-OAB) report, on behalf of the MISTICI
collaboration:
We observed again the field of the short GRB 071227 (Sakamoto et al.,
GCN 7147; Sato et al. GCN 7148 and GCN 7156) with the ESO-VLT equipped
with the FORS2 camera in imaging mode on Dec 31.2147. We compared our
images with respect to our first epoch of observations (Dec 28.1328;
D'Avanzo et al., GCN 7152). Image subtraction performed with the ISIS
package on our two sets of images clearly shows the presence of an
optical afterglow inside the refined XRT error box (Beardmore et al.,
GCN 7153). This object is clearly associated to the candidate host
galaxy (Berger et al. 7151; D'Avanzo et al. GCN 7152). The coordinates
of the afterglow are (J2000):
R.A. = 03:52:31.26
Dec. = -55:59:03.5
with an uncertainty of 0.3". The afterglow is located at about 3.1" from
the bulge, which corresponds to about 16.1 kpc at z=0.383 (D'Avanzo et
al. GCN 7152; Berger et al. GCN 7154).
A figure showing the result of the subtraction can be found at the
following URL:
http://www.brera.inaf.it/utenti/davanzo/public/grb/GRB071227/GRB071227_subtraction.jpg
We acknowledge support from the ESO staff.