[vsnet-grb-info 9105] GRB 100413A: GROND Upper limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Apr 15 02:12:00 JST 2010
TITLE: GCN CIRCULAR
NUMBER: 10592
SUBJECT: GRB 100413A: GROND Upper limits
DATE: 10/04/14 17:10:42 GMT
FROM: Thomas Kruehler at MPE/MPI <kruehler at mpe.mpg.de>
Robert Filgas, Thomas Kruehler, Jochen Greiner and Abdullah Yoldas (all
MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 100413A (Swift trigger 419404; Holland et
al., GCN #10581) 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 at La
Silla Observatory (Chile).
Observations started at 05:43 UT on April 14, 12 hours after the GRB
trigger, and continued for 2.5 hours. They were performed at an average
seeing of 1" under clear sky conditions.
In stacked images of 125 min total integration time in g'r'i'z' and 100
min in JHK, we do not detect a source within the Swift/XRT error circle
(Goad et al., GCN #10584) down to the following 3 sigma limiting
magnitudes (all in the AB system):
g' > 25.3,
r' > 25.2,
i' > 24.6,
z' > 24.3,
J > 22.5,
H > 22.1 and
K > 21.1
These limits were derived by calibrating the images against the GROND
zeropoints and 2MASS field stars and are not corrected for the Galactic
foreground extinction corresponding to a reddening of E_(B-V)= 0.11 in
the direction of the burst (Schlegel et al. 1998).
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