GCN Circular 13426
Subject
GRB 120709A: optical afterglow limits
Date
2012-07-10T19:42:25Z (13 years ago)
From
Jochen Greiner at MPI <jcg@mpe.mpg.de>
J. Elliott, J. Greiner (both MPE Garching), A. Nicuesa Guelbenzu, S. Schmidl,
S. Klose (all TLS Tautenburg) report on behalf of the GROND team:
We observed the field of GRB 120709A (Kocevski et al., GCN #13423) with the
Wide-Field Imager (WFI; 33 arcmin field-of-view) at the 2.2 m MPG/ESO
telescope at La Silla Observatory (Chile). In order to cover the 0.35 deg
radius error circle, a mosaic of 2*2 pointings was performed. The sequence
of exposures started at 07:42 UT, 10.5 hrs after the GRB, with 10 min
exposure per tile. The observations were performed at an average airmass
of 1.13, mean seeing of 1 arcsec, and a Moon distance of 80 deg.
We compared our R-band images with the DSS2-R plates, but find no new object
brighter than R~19 mag within the 0.35 deg radius error circle.