[vsnet-grb-info 6662] GRB 080916A: GROND lightcurve
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Sep 18 20:23:24 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8266
SUBJECT: GRB 080916A: GROND lightcurve
DATE: 08/09/18 11:23:16 GMT
FROM: Andrea Rossi at TLS Tautenburg <rossi at 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.
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