[AAVSO-HEN] GRB 090509: GROND afterglow candidate

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  9326
SUBJECT: GRB 090509: GROND afterglow candidate
DATE:    09/05/09 06:00:25 GMT
FROM:    Thomas Kruehler at MPE/MPI  <kruehler at mpe.mpg.de>

F. Olivares, J. Greiner, T. Kruehler (all MPE Garching) and S. Klose (TLS) 
report on behalf of the GROND team:

We observed the field of GRB 090509 (Swift trigger 351525; Grupe et
al., GCN #9325) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.
2008, PASP 120, 405) mounted at the 2.2 m ESO/MPI telescope at La Silla
Observatory (Chile).

We detect a bright uncatalogued source in all bands at

16:05:39.01 -28:23:59.7

with a magnitude of r' = 17.9 at 15 min after the burst, calibrated using 
the GROND zeropoint.