[AAVSO-HEN] GRB 080825B - optical counterpart candidate

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  8135
SUBJECT: GRB 080825B - optical counterpart candidate
DATE:    08/08/26 01:15:20 GMT
FROM:    Christina Thoene at Niels Bohr Institute,DARK Cosmo Ctr  <cthoene at astro.ku.dk>

Christina C. Thoene (DARK/NBI), Antonio de Ugarte Postigo (ESO) and Davide
Ricci (Univ. of Liege) report:

We observed the complete 3' error box of the SuperAGILE GRB 080825B
(Evangelista et al., GCN 8133) using the Danish 1.54m + DFOSC at La
Silla (Chile) starting Aug. 25 at 23:18:31 UT (5.53 hours after the
burst). In the first I-band frame we detect a new source not present
in the DSS-2 catalogue at the following coordinates (J2000.0 +/-
0.7"):

RA: 13:56:48.22
DEC: -68:57:18.5

for which we measure an I-band magnitude of 17.4 +/- 0.2 as compared
to several USNO-B1 stars.

A finding chart can be found at:
http://www.sc.eso.org/~adeugart/GRB/080825/080825.jpg

Further observations and analysis are ongoing to establish the connection
to the GRB and the fading of the object.