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GCN Circular 11337

GRB 101011A, GROND upper limits
2010-10-12T13:43:38Z (14 years ago)
Sylvio Klose at TLS Tautenburg <>
M. Nardini, T. Kruehler (both MPE Garching), S. Klose, A. Rossi (both TLS 
Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND 

We observed the field of GRB 101011A (Swift trigger #436094; Cannizzo et 
al. 2010, GCN #11331; Markwardt et al. 2010, GCN #11332) simultaneously in 
g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 
2.2 m MPI/ESO telescope on LaSilla. Observations started at 00:10 UT, 
October 12, i.e. seven hours after the burst once the field became visible 
over La Silla.

In stacked images with a mid-time of 1:06 UT (seeing 2.2 arcsec; mean 
airmass 1.8) we do not detect any source at the position of the faint 
optical transient seen by UVOT (Holland et al. 2010, GCN #11334) down to 
the following limits (3 sigma, AB system):

g' > 24.4,
r' > 23.7,
i' > 22.7,
z' > 22.5,
J  > 22.1,
H  > 21.5.

These upper limits have been calibrated based on USNO and 2MASS stars.
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