GCN Circular 8194
Subject
GRB 080906: GROND observations of the optical/NIR afterglow
Date
2008-09-07T09:44:25Z (16 years ago)
From
Paulo M. J. Afonso at MPE <pafonso@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).