GCN Circular 10616
Subject
GRB 100418A: GROND observations
Event
Date
2010-04-19T06:01:52Z (16 years ago)
From
Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>
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 100418A (Marshall et al. 2010, GCN 10612) on
Apr 19, at 4:50 UT (about 7.5 hrs after the burst).
Within the enhanced XRT 1.9 arcsec error circle reported by Osborne et al.
(GCN 10614) we find a fading point source at coordinates RA, DEC (J2000) =
17:05:27.09,
11:27:42.3
with an uncertainty of 0.5" in each coordinate and estimate the following
preliminary magnitudes (in the AB system):
g' = 19.2 +- 0.1
r' = 18.8 +- 0.1
i' = 18.4 +- 0.1
z' = 18.1 +- 0.1
J = 17.7 +- 0.1
Given magnitudes are calibrated against SDSS field stars and are not
corrected for the expected Galactic foreground extinction corresponding to
a reddening of E_(B-V)=0.07 mag in the direction of the burst (Schlegel et
al. 1998).