[vsnet-grb-info 6588] GRB 080906: GROND observations of the
optical/NIR afterglow
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sun Sep 7 18:44:37 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8194
SUBJECT: GRB 080906: GROND observations of the optical/NIR afterglow
DATE: 08/09/07 09:44:25 GMT
FROM: Paulo M. J. Afonso at MPE <pafonso at mpe.mpg.de>
GRB 080906: GROND observations of the optical/NIR afterglow
P.Afonso, T. Kruehler, J. Greiner, C.Clemens, A. Yoldas (all MPE Garching)
and A. Kuepcue Yoldas (ESO) report on behalf of the GROND team:
We observed the field of GRB 080906 (Swift trigger 323984; L. Vetere et
al., GCN #8186), simultaneously in g'r'i'z'JHK with GROND (Greiner et al.
2008, PASP 120, 405) mounted at the 2.2m ESO/MPI telescope at La Silla
Observatory (Chile).
Observations started at 00:12 UT on September 7th, 2008, 10.7 hrs after
the GRB trigger.We detect the optical afterglow reported by L. Vetere et
al. (GCN #8186) at a position consistent with the UVOT detection in all
bands, implying a redshift smaller than 3.5.
Preliminary photometry yields the following magnitudes calibrated against
USNO-B1 and 2MASS field stars in stacked images:
Band Exp(min) Mag
g' 24 22.2 +- 0.1
r' 24 21.4 +- 0.1
i' 24 21.2 +- 0.1
z' 24 21.2 +- 0.1
J 20 20.2 +- 0.1
H 20 19.2 +- 0.1
K 20 18.5 +- 0.1
not corrected for the expected Galactic foreground reddening of E(B-V) =
0.30 mag (Schlegel et al., 1998).
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