GCN Circular 8373

R. Filgas, T. Kruehler, J. Greiner, C. Clemens, A. Yoldas (all MPE
Garching), A. Rossi (Tautenburg Obs.), A. Kupcu Yoldas (ESO) and
G. Szokoly (Eoetvoes Univ., Budapest) report on behalf of the GROND team:

GROND (Greiner et al. 2008, PASP 120, 405), mounted at the 2.2m
ESO/MPI telescope at La Silla Observatory (Chile), started
observations of the field of GRB 081012 (Stroh et al. 2008, GCN #8361)
in g'r'i'z'JHK at 07:43 UT on 13. Oct. 2008, 18.5 hours after
the burst. This burst was also detected by the Fermi GBM (Bissaldi
2008, GCN #8370). GROND observations consisted of 20 115-s
integrations in g'r'i'z' and 240 10-s integrations in JHK.

We do not detect a source in the XRT error circle (Kennea & Stroh
2008, GCN #8364) in the stacked images down to limiting magnitudes
(all in Vega system) of

g' > 23.2
r' > 23.5
i' > 22.8
z' > 22.8
J > 21.5
H > 20.4
K > 19.4

The given limits are derived based on calibrating the images
against USNO and 2MASS field stars and are not corrected for the Galactic
foreground extinction corresponding to a reddening of E_(B-V)= 0.023
in the direction of the burst (Schlegel et al. 1998).