[vsnet-grb-info 6774] GRB 081012: GROND upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8373
SUBJECT: GRB 081012: GROND upper limits
DATE:    08/10/14 09:44:50 GMT
FROM:    Robert Filgas at MPI  <filgas at mpe.mpg.de>

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).