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GCN Circular 10793

GRB 100522A: GROND observations, upper limits
2010-05-23T16:03:15Z (14 years ago)
Sylvio Klose at TLS Tautenburg <>
P. Afonso (MPE Garching), S. Klose (TLS Tautenburg), and J. Greiner (MPE 
Garching), report on behalf of the GROND team:

GROND (Greiner et al. 2008, PASP 120, 405), the 7-channel imager mounted 
at the 2.2m ESO/MPI telescope on La Silla, started follow-up observations 
of the Swift/Fermi burst GRB 100522A (Troja et al. 2010, GCN 10784; 
McBreen 2010, GCN 10790) on May 23 at 09:18 UT (about 29.5 hrs after the 
burst), and continued for about 1 hour.

Within the enhanced XRT 1.5 arcsec error circle reported by Osborne et al. 
(GCN 10787) we do not find any afterglow candidate. Based on 50 min of 
total exposures in g'r'i'z' and 40 min in JHK, preliminary measured upper 
limits are (in the AB system, 3 sigma):

g' > 24.8,
r' > 24.4,
i' > 23.6,
z' > 23.3,
J  > 21.7,
H  > 20.9,
K  > 20.6,

using GROND zeropoints and the 2MASS catalog.
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