GCN Circular 9128
Subject
GRB 090410: GROND upper limits
Date
2009-04-14T16:18:34Z (16 years ago)
From
Jochen Greiner at MPI <jcg@mpe.mpg.de>
P. Afonso, T. Kruehler, A. Rau 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 at La Silla Observatory (Chile) started
follow-up observations of GRB 090410 (Grupe et al. 2009, GCN #9122) on April
11, at 10:17 UTC (17.3 h after the burst). In addition, a second epoch of
imaging was obtained, which started on April 12, 10:10 UTC.
Observations were performed at high airmass (~2.5) and limited to a total
of 4 min exposures in each J, H and K in both epochs because of Sun
constraints.
We do not detect any new object with respect to 2MASS inside the enhanced
BAT error circle (Barthelmy et al. 2009, GCN #9123), and image subtraction
between the two epochs does not reveal any obvious variable source. Upper
limits from the first observation are as follows (all in the AB system):
J > 19.1 mag
H > 19.0 mag
K > 18.1 mag
The upper limits have been obtained using 2MASS field stars as reference.
The given magnitudes are not corrected for the expected Galactic foreground
extinction of E(B-V) of 0.05 mag.