GCN Circular 8266
Subject
GRB 080916A: GROND lightcurve
Date
2008-09-18T11:23:16Z (16 years ago)
From
Andrea Rossi at TLS Tautenburg <rossi@tls-tautenburg.de>
A. Rossi (Tautenburg Obs.),T. Kruehler, J. Greiner, A. Yoldas, C. Clemens,
R. Filgas (all MPE Garching), 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 080916A (Ziaeepour et al. GCN #8237) in g'r'i'z'JHK at
23:57:34 UT on 2008-09-16, 14 hours after the burst trigger.
We clearly detect the optical afterglow detected by UVOT (Ziaeepour
et al. GCN #8237) and REM telescope (Fugazza et al. GCN #8238).
Observations continued for 60 min and were repeated at the mid-time
06:40 UT for total 60 min.
Calibrating the field on USNO-B1 stars, we derive the following
r band magnitudes, not corrected for the Galactic foreground
extinction corresponding to a reddening of E_(B-V)=0.019 mag
(Schlegel et al. 1998):
midtime(s) r er
52239 21.8 0.03
54054 21.9 0.04
74076 22.1 0.07
76260 22.3 0.07
The total r band light curve is well fitted by power law with index
of 0.81+- 0.13. Assuming the optical light curve continues
the decline with the same power law index, we predict r'
band magnitudes 23.4 at 3 days after the burst.