K. Varela (MPE Garching), S. Klose, A. Nicuesa Guelbenzu (both TLS
Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND
We observed the field GRB 130529A (Swift trigger 556930; D' Elia et al.,
GCN 14717) simultaneously in g'r'i'z'JHKs with GROND (Greiner et al.
2008, PASP 120, 405) mounted at the 2.2m MPG/ESO telescope at La Silla
Observations started at 07:10 UT on May 30, about 20 hours after the
trigger at a mean seeing of 1.7 arcsec and a mean airmass of 2. Inside
the enhanced 1".4 XRT error circle (Osborne et al., GCN 14723), we do not
detect any source. Based on an observation with 150 min integration time
in g'r'i'z' and 124 min integration time in JHKs, we estimate preliminary
3-sigma upper limits (all in the AB system) of
g' > 24.3,
r' > 24.6,
J > 21.8,
H > 21.1.
We note that the field is rich in galaxies. Within 10 arcsec around the
XRT error circle are at least three objects (also visible on DSS2), with
the most extended one an edge-on galaxy about 6" in diameter. The bad
seeing prevents at the moment a more detailed classification of the other
Magnitudes are calibrated against GROND zero points (g'r'i'z') as well as
2MASS field stars (JHKs) and, as usual, are not corrected for Galactic
extinction along the line of sight.